JP6401205B2 - Leg length measuring device and leg length measuring method - Google Patents

Description

  The present invention relates to a leg length measuring device and a leg length measuring method.

  In recent years, conservative therapy has been performed for diseases such as osteoarthritis, rheumatoid arthritis, and femoral head necrosis that cause damage to the hip joint due to illness, accidents, aging, etc. When hip pain is not alleviated, or when symptoms or hip joint deformation has progressed considerably, artificial hip joint replacement is performed in which a damaged portion is replaced with an artificial hip joint.

  Before and during hip replacement surgery, the size of the patient's pelvis and the inclination of the pelvis relative to the imaginary line connecting the heels of both legs are measured. Resection and placement of an artificial hip joint. However, due to various factors, a difference in leg length after surgery occurs, that is, the length from the upper anterior iliac spine to the buttocks may not be uniform. Actually, the presence or absence of the leg length difference was confirmed during the operation, but only the leg length was visually confirmed, and no objective measurement was made. As a result, if the operation is completed with the difference in leg length left and left as it is, there is a possibility that the patient's body may be malfunctioned, for example, the spine bends to the side.

  Conventionally, when the above-mentioned difference in leg length has occurred, measures such as raising the sole of the shoe have been taken, but patients need to prepare specially-designed shoes, and improvements are required in terms of costs. It was.

Thus, attempts have been made to measure leg length in hip replacement.
For example, in Patent Document 1, two retractor pins are connected for the exclusion of the gluteus muscle attached to the iliac bone on the acetabulum side, and the measuring rod is used for measuring the leg length during surgery. A surgical instrument is disclosed that is connected to a pin and measures the distance of the greater trochanter via an artificial joint from the iliac bone. When using the surgical instrument disclosed in Patent Document 1, first of all, the marker steel wire attached to the ruler with a measuring rod installed on the patient's neck with the retractor pin standing on the iliac as a reference position Mark the length near the greater trochanter with an electric knife, flea, or pigment at the tip and measure the length. During the actual excavation operation of the acetabulum, the retractor pin is left as it is, and the measuring rod is removed during the operation. After completion of the hip replacement, the measuring rod and the ruler (ie, the marker steel wire) are attached again, and the distance to the marking of the greater trochanter part attached immediately after the operation is measured. The leg length is determined by such a procedure.

Japanese Patent Laid-Open No. 11-047137

  However, in the surgical instrument described in Patent Document 1, since the retractor pin is driven into the patient's iliac bone, there is a concern that bones, muscles and the like including the iliac bone are damaged. Further, since the configuration of the surgical instrument and the procedure for measuring the leg length are complicated, there is a concern that the measurement takes time and the skill of the operator is required.

  As another leg length measurement method, there is a method in which a metal member or the like is placed in advance on an appropriate site such as the upper anterior iliac spine to perform X-rays or photography, and the leg length is confirmed by image analysis. However, in the method of confirming the leg length by the above-described image analysis (a method using a so-called navigation device), the metal member is hit against the upper anterior iliac spine, so that the bone, muscle, etc. including the upper anterior iliac spine are damaged. There was concern. In addition, since an X-ray fluoroscopy device is used during surgery, there is a concern that it will be exposed to an explosion. Furthermore, there is a concern that the burden on the patient and the treatment facility will increase because of the use of a large-scale and expensive dedicated device for navigation.

  That is, conventionally, in hip replacement surgery, the patient's leg length has not been objectively measured, and the operation may be completed without clearly confirming whether the leg lengths of both the left and right legs are aligned. Even if the leg length is accurately measured using the above-described leg length measuring method, there are problems that bones and muscles are damaged, and that the configuration is complicated or large.

  The present invention provides a leg length measuring apparatus and a leg length measuring method that can measure the leg length objectively with a simple configuration without damaging bones and muscles.

  The leg length measuring device according to the present invention can be connected to a first shaft portion that can be locked to a pair of upper anterior iliac spines of a measurement subject, and one end can be connected to an axial end portion of the first shaft portion. A pair of second shaft portions provided in the vicinity of both ends of the first shaft portion so as to extend in a second direction orthogonal to the first direction parallel to the axial direction of the first shaft portion when connected And configured to be connectable to the other end of the second shaft portion, arranged along the first direction when connected, and configured to be capable of placing the measurement subject's buttocks, and the buttocks And a measuring part provided with a guide part capable of measuring the position of

  In the above-described leg length measuring device, the measurement unit is configured by a plate-like member having a predetermined width dimension along the first direction and the second direction, and the guide unit is the measurement target in the plate-like member. It is preferable that the person's buttocks are provided on a plate surface on which the person can be placed, and are formed of a plurality of line groups that extend in the first direction and are formed at a predetermined interval in the second direction.

  In the above-described leg length measuring device, it is preferable that the second shaft portion is provided with a length adjusting portion that can adjust the length dimension in the second direction.

  Moreover, in the above-mentioned leg length measuring device, it is preferable that the measurement part is provided with a hook part locking part that can be locked to the hook part.

  In the above-described leg length measurement device, it is preferable that an abdomen bending portion that can be bent along the abdomen of the measurement subject is formed on the first shaft portion.

  The leg length measuring method of the present invention is a leg length measuring method for measuring a leg length of a measurement subject using the above-described leg length measurement device, wherein the first shaft portion is attached to a pair of upper anterior iliac spines of the measurement subject. A step of locking, a step of connecting one end of the second shaft portion to both ends in the axial direction of the first shaft portion, a step of connecting the measuring portion to the other end of the second shaft portion, Placing the measurement subject's buttocks on the measurement unit in a state in which the first shaft portion is locked to the superior anterior iliac spine, and measuring the position of the buttocks using the guide unit; It is characterized by providing.

  According to the leg length measuring device and the leg length measuring method of the present invention, the first shaft portion is locked to the pair of upper anterior iliac spines of the measurement subject, and the second shaft portion is disposed at the axial end portion of the first shaft portion. If the measurement part is connected to the other end of the second shaft part, the position of the hip part relative to the first shaft part, that is, the leg length is objectively measured by the relative positional relationship between the hook part and the guide part. It becomes possible. Thereby, even during surgery, the length (ie, leg length) from the upper anterior iliac spine to the buttocks can be measured objectively and more accurately. Further, it can be easily confirmed whether or not the leg lengths of both the left and right legs are aligned.

It is a figure of the leg length measuring device of one embodiment to which the present invention is applied, (a) is a top view and (b) is a side view. It is a side view which shows the modification of the leg length measuring apparatus of one Embodiment to which this invention is applied. It is the schematic which shows a mode that the position of a knee is measured using the measurement part of the leg length measuring apparatus of one Embodiment to which this invention is applied, aligning a patient's both lower leg.

  Hereinafter, a leg length measuring device and a leg length measuring method according to an embodiment to which the present invention is applied will be described with reference to the drawings. The drawings used in the following description are schematic, and the length, width, thickness ratio, and the like are not necessarily the same as actual ones, and can be changed as appropriate.

  A leg length measuring apparatus 1 which is an embodiment to which the present invention is applied (hereinafter referred to as “this embodiment”) is shown in FIG. 1 (a). This is for measuring the length from the iliac spine 2 to the rib (buttock) 3, that is, the leg length LL of the left leg and the leg length LR of the right leg. The upper anterior iliac spine 2 is a portion protruding forward in the upper portion of the iliac 4 that is a part of the pelvis. Hereinafter, the abdominal side of the patient U is referred to as “front side”, the opposite side (that is, the back side) of the patient U is referred to as “rear side”, and the front-rear direction is referred to as “front-rear direction”. To do. Further, the head side of the patient U is “upper side”, the heel side is “lower side”, the axial direction perpendicular to the front-rear direction and along the height of the patient U is “up-down direction”, and The direction orthogonal to both (that is, the left-right direction of the patient U and the vertical direction of the paper surface of FIG. 1A) is defined as the “width direction”.

  In the present embodiment, as a patient U, a joint deformed by osteoarthritis of the hip, rheumatoid arthritis, femoral head necrosis, fracture or the like is replaced with an artificial hip joint H made of metal such as titanium alloy, ceramic, polyethylene, or the like. An explanation will be given assuming that the patient undergoes hip replacement. As shown in FIG. 1A, a state where the joint of the left leg of the patient U is replaced with an artificial hip joint H is illustrated. During the operation of hip replacement, as shown in FIG. 1 (b), the patient U is in a so-called supine position (position called supine position) with the abdomen facing the ceiling, and the surgical bed Lying on (or operating table) B. On the other hand, in the horizontal posture (position called the lateral position), when the hip prosthesis H is installed, the pelvis is likely to be inclined in the “front-rear direction”, “vertical direction”, and “width direction”. Positioning the artificial hip joint H in the acetabulum of the iliac bone of the pelvis is not accurate and increases the variation.

  As shown in FIGS. 1A and 1B, the leg length measuring device 1 includes a first shaft portion 11, a pair of second shaft portions 12 </ b> L and 12 </ b> R, and a measuring portion 13.

  The first shaft portion 11 is configured to be able to be locked to a pair of left and right upper anterior iliac spines 2L and 2R of the patient U. Specifically, the 1st axial part 11 is a rod-shaped member arrange | positioned so that it may extend along the 1st direction D1. The first direction D1 is parallel to the horizontal direction. Further, the upper end portion 11a of the first shaft portion 11 is pressed against the lower end portions 2Lb and 2Rb of the upper anterior iliac spines 2L and 2R by an operator, an assistant, or the like or an auxiliary tool (not shown). It has been.

  An abdomen bending portion 16 that can be bent along the abdomen of the patient U is formed in the first shaft portion 11. The abdomen bending part 16 is curved so as to be convex toward the front side in accordance with the shape of the abdomen of the patient U and so that the approximate center in the axial direction of the first shaft part 11 is located at the most front side.

One end (one end) 12La, 12Ra in each of the second shaft portions 12L, 12R is configured to be connectable to the end portions 11x, 11y of the first shaft portion 11 in the axial direction. Specifically, the 2nd axial part 12 is arrange | positioned so that it may extend along the 2nd direction D2 orthogonal to the 1st direction D1 parallel to the axial direction of the 1st axial part 11, and a horizontal direction. It is a member. Moreover, the through-hole 12h which can fit the 1st axial part 11 along the 1st direction D1 is formed in edge part 12La, 12Ra of 2nd axial part 12L, 12R. Therefore, the end portions 11x and 11y of the first shaft portion 11 are inserted into the through holes 12h of the second shaft portions 12L and 12R along the first direction D1, respectively, so that the ends of the second shaft portions 12L and 12R are inserted. The portions 12La and 12Ra are connected to the end portions 11x and 11y of the first shaft portion 11.
Accordingly, the second shaft portions 12L and 12R are provided near the ends (both ends) 11x and 11y of the first shaft portion 11 so as to extend in the second direction D2 when connected to the first shaft portion 11. Yes.

  As shown in FIG. 1B, in the vertical direction D3, there is a height difference between the ends 2Lb and 2Rb of the upper anterior iliac spines 2L and 2R of the patient U and the ends 3Lb and 3Rb of the ribs 3L and 3R. There is a difference. In consideration of such a height difference, the second shaft portions 12L and 12R are each configured by a cylindrical member 17 and a rod-shaped member 18 disposed on the upper side.

  The cylindrical member 17 is a cylindrical member in which a hollow portion 17s having substantially the same dimensions as the through hole 12h is formed in the vertical direction D3. The above-described through hole 12 h is formed at the upper end of the cylindrical member 17. The cylindrical member 17 extends along the second direction D2 from the upper side to the lower side, refracts in the vertical direction D3 at a predetermined position on the lower side, and ends 2Lb of the upper anterior iliac spines 2L and 2R. , 2Rb and the ends 3Lb, 3Rb of the ribs 3L, 3R extend to a substantially intermediate position along the vertical direction D3. The lower end of the hollow portion 17s is open.

The upper side of the rod-shaped member 18 is raised on the opposite side of the vertical direction D3 and is inserted into the hollow portion 17s of the cylindrical member 17 from the open end side. Since a locking mechanism (not shown) is attached to the connecting portion between the tubular member 17 and the rod-shaped member 18, the insertion dimension of the rod-shaped member 18 with respect to the tubular member 17 is changed in the vertical direction D3, so that the tube The height difference between the upper side of the rod-like member 17 and the lower side of the rod-like member 18 can be adjusted as appropriate.
Each of the cylindrical member 17 and the rod-shaped member 18 is preferably provided with a folding mechanism such as a hinge mechanism (not shown) so that it can be folded in the longitudinal direction. Thereby, the leg length measuring apparatus 1 before and behind use can be made compact.

  The lower side of the rising portion of the rod-shaped member 18 is in contact with the upper surface of the surgical bed B and extends along the second direction D2 toward the lower end. A first locking portion 20 that protrudes forward from the rod-shaped member 18 is provided at a position that is a predetermined dimension above the lower end of the rod-shaped member 18. The 1st latching | locking part 20 forms the edge parts 12Lb and 12Rb of the 2nd axial part 12 (refer Fig.1 (a)). It is preferable that the 1st latching | locking part 20 is comprised so that a movement along the 2nd direction D2 is possible. A second locking portion 21 that protrudes to the front side is provided at the lower end of the rod-shaped member 18.

The measurement unit 13 is configured to be connectable to the other ends (other ends) 12Lb and 12Rb of the second shaft portions 12L and 12R. Specifically, the measurement part 13 is comprised from the plate-shaped member 23 which has a predetermined width dimension along the 1st direction D1 and the 2nd direction D2. A locked portion 22 that can be locked to the first locking portion 20 is provided at an upper end portion of the measuring portion 13. The locked portion 22 is provided so as to protrude in the vertical direction D3 from the plate surface facing the bed B at the upper end of the plate-like member 23.
Accordingly, as shown in FIG. 1 (a), the measuring unit 13 is arranged along the first direction D1 when connected to the second shaft portions 12L and 12R, and the pair of left and right ribs 3L, 3R can be placed.

  As can be seen from FIG. 1B, the locked portion 22 is movable between the first locking portion 20 and the second locking portion 21 along the second direction D2. As described above, if the first locking portion 20 is also configured to be movable along the second direction D2, the first locking portion 20 and the locked portion 22 are kept engaged with each other. The locking portion 22, that is, the measurement portion 13 can be moved, and at the same time, the length dimension of the second shaft portions 12L and 12R in the second direction D2 can be changed. Thus, the part between the 1st latching | locking part 20 and the 2nd latching | locking part 21 functions as an adjustment mechanism of the length dimension in the 2nd direction D2 of the 2nd axial parts 12L and 12R. That is, the second shaft portions 12L and 12R are provided with a length adjusting portion 19 that can adjust the length dimension in the second direction D2. The dimension of the length adjusting unit 19 in the second direction D2 is appropriately set in consideration of the fluctuation range of the leg lengths LL and LR of the patient U to be measured.

  The measuring part 13 is provided with a hook part locking part 24 which can be locked to the ribs 3L, 3R. Specifically, a recess 13u is formed on the plate member 23 on the plate surface on which the ribs 3L and 3R of the patient U can be placed. When the ribs 3L and 3R are placed inside the recess 13u, a protective layer 15 is formed on the inner wall surface of the recess 13u in order to protect the ribs 3L and 3R and enhance the comfort of the patient U. Yes. The protective layer 15 is made of, for example, synthetic resin, silicon, air mat, polyurethane foam, synthetic rubber (exgel), super flexible special material (action pad), etc. If it has elasticity, it will not be specifically limited.

  The measurement unit 13 is provided with a guide unit 14 that can measure the positions of the ribs 3L and 3R. Specifically, the guide part 14 is provided on a plate surface (that is, a front plate surface) on which the ribs 3L and 3R of the patient U can be placed in the plate-like member 23, and extends in the first direction D1. In addition, a group (line group) of a plurality (n) of lines I (1), I (2),..., I (n) formed in order from the upper side with a certain interval in the second direction D2. It consists of

  A group of a plurality of lines I (1), I (2),..., I (n) functions as a scale when measuring the leg lengths LL and LR. In order to make it easier to confirm the positions of the end portions 3Lb and 3Rb of the ribs 3L and 3R placed on the plurality of lines I (1), I (2), ..., I (n) more easily and accurately, The line types or colors of the adjacent lines I (1), I (2),..., I (n) are preferably different, and each line I (1), I (2),. It is preferable that a mark or a numerical value that serves as a reference for the leg lengths LL and LR is described at at least one of the ends.

  Examples of the material of the first shaft portion 11, the second shaft portion 12, and the measurement portion 13 include stainless steel (SUS), wood, aluminum alloy, synthetic resin, polyurethane foam, and the like.

Next, a method for measuring the leg length of the patient U that measures the leg lengths LL and LR using the above-described leg length measuring apparatus 1 of the present embodiment in an operation or the like will be described with reference to FIGS.
The leg length measurement method of the present embodiment includes a step of locking the first shaft portion 11 to the pair of upper anterior iliac spines 2L and 2R of the patient U, and end portions 11x and 11y in the axial direction of the first shaft portion 11. A step of connecting the end portions 12La, 12Ra of the second shaft portion 12, a step of connecting the measuring portion 13 to the end portions 12Lb, 12Rb of the second shaft portion 12, and the first shaft to the superior anterior iliac spines 2L, 2R. A step of placing the collar part 3 on the measurement part 13 in a state where the part 11 is locked, and measuring the positions of the ribs 3L and 3R using the guide part 14.

  First, the patient U is laid on the surgical bed B in a so-called supine posture (a posture called a supine position). Subsequently, an artificial hip joint replacement for replacing the original joint with an artificial hip joint H is performed by appropriately incising the vicinity of the joint of the patient U deformed by a fracture or the like.

After the replacement of the artificial hip joint H, before the incised portion is sutured, the end portion 11a of the first shaft portion 11 is attached to the upper anterior iliac spine 2L, by an operator, an assistant, or an auxiliary tool (not shown). The lower end 2Lb and 2Rb of 2R are locked so as to be pressed.
Subsequently, the end portions 11x and 11y of the first shaft portion 11 are respectively inserted into the through holes 12h of the second shaft portions 12L and 12R along the first direction D1.
Subsequently, the locked portion 22 of the measuring unit 13 is locked to the first locking portion 20, and the ribs 3 </ b> L and 3 </ b> R of the patient U are installed on the buttocks locking portion 24 of the measuring unit 13.

  In the above-described state, the end 2Lb of the upper anterior iliac spine 2L of the left leg and the lower end 3Lb of the lower rib 3L are set along a predetermined direction such as the second direction D2, and the rib 3L at that time It is confirmed which line I (1), I (2),..., I (n) of the guide part 14 is overlapped with the position of the end 3Lb, and the overlapped p-th line I (p) Based on this, the leg length LL is measured. Similarly, the end 2Rb of the upper anterior iliac spine 2R of the right leg and the lower end 3Rb of the rib 3R are aligned along a predetermined direction such as the second direction D2, and the end of the rib 3R at that time It is checked which line I (1), I (2),..., I (n) of the guide part 14 the position of the part 3Rb overlaps, and based on the overlapped qth line I (q) Measure leg length LR. In that case, the position of the end portion 3Lb of the rib 3L and the position of the end portion 3Rb of the rib 3R are equal along the first direction D1 between the second shaft portions 12L and 12R (that is, in the width direction, The distance between the biaxial portion 12L and the end 3Lb of the radius 3L, the interval between the end 3Lb of the radius 3L and the end 3Rb of the radius 3R, and the end 3Lb of the radius 3L and the second axis 12R Are arranged so that the distance between the left and right legs is equal to each other.

As described above, the left and right leg lengths LL and LR are measured, and if the order p and the order q of the lines of the guide portion 14 are equal, that is, if p = q, the difference between the left and right leg lengths LL and LR is extremely small. That is, it can be seen that there is no difference in leg length.
When the order p and the order q of the lines of the guide portion 14 are different, the artificial hip joint H is once taken out from the body of the patient U and the size of the artificial hip joint H is finely adjusted, or around the place where the artificial hip joint H is installed. Perform cutting, etc.
Thereafter, the same operation is repeated until the left and right leg lengths LL and LR are equal. When it is confirmed that the left and right leg lengths LL and LR are equal, the incised portion is sutured.
Through the above steps, the hip replacement is completed and the left and right legs of the patient U are aligned.

In the leg length measuring device 1 and the leg length measuring method described above, the end portion 11a of the first shaft portion 11 is locked to the end portions 2Lb and 2Rb of the left and right upper anterior iliac spines 2L and 2R of the patient U. The upper reference of the leg lengths LL and LR can be accurately taken. The measurement unit 13 extends in the first direction D1 parallel to the axial direction of the first shaft portion 11 via the second shaft portion 12, and the end portions 3Lb of the pair of left and right ribs 3L and 3R of the patient U. , 3Rb is placed on a line group extending in the first direction D1 of the guide portion 14, so that the ends 2Lb, 2Rb of the superior anterior iliac spines 2L, 2R are based on the information of the lines I (p), I (q). It is possible to accurately and objectively indicate the positions of the end portions 3Lb and 3Rb of the ribs 3L and 3R with reference to. Conventionally, the leg lengths LL and LR are determined by the thickness of the cloth and the displacement of the patient U because the cloth is put on the patient U as in the case where the leg lengths LL and LR are confirmed using a chain or copper wire. Problems such as inaccurate measurement are also solved.
Thereby, even during surgery, for example, the complicated device configuration and the operation procedure are not required, and the leg lengths LL and LR of both the left and right legs are measured by a simple process using a simple configuration. It can be easily confirmed whether or not the lengths from the iliac spines 2L, 2R to the ribs 3L, 3R are aligned. Further, according to the leg length measuring device 1 and the leg length measuring method of the present embodiment, it is not necessary to directly drive any jig or the like into the patient U as in the conventional method using the retractable pin or the method using the navigation system. It doesn't hurt or muscles, and it doesn't get exposed.

  Further, in the leg length measuring device 1 and the leg length measuring method of the present embodiment, the guide portion 14 is provided on a plate surface on which the patient's ribs 3L and 3R can be placed on the plate-like member 23, and in the first direction D1. It is composed of a plurality of line groups that extend and are formed at a predetermined interval in the second direction D2. Thereby, the positions of the ends 3Lb and 3Rb of the ribs 3L and 3R are more accurately and quantitatively referred to by referring to the positions of the lines I (1), I (2),. Can be confirmed. Therefore, the leg lengths LL and LR of the left and right legs of the patient U can be measured more accurately and quantitatively.

  Further, according to the leg length measuring device 1 and the leg length measuring method of the present embodiment, the second shaft portion 12 is provided with the length adjusting portion 19 that allows the length dimension in the second direction D2 to be adjusted. For example, it is possible to correspond to the measurement of the leg lengths LL and LR of the patient U having different leg lengths LL and LR such as children to adults.

  In addition, according to the leg length measuring device 1 and the leg length measuring method of the present embodiment, the measuring unit 13 is provided with the recess 13u as the buttock locking portion 24 that can be locked to the ribs 3L, 3R. When measuring the leg lengths LL and LR, the ribs 3L and 3R of the patient U can be more stably placed on the measurement unit 13. Since the protective layer 15 is provided in the recess 13u, the ribs 3L and 3R can be placed on the measurement unit 13 in a state where the ribs 3L and 3R are further protected without causing discomfort to the patient U.

  Further, according to the leg length measuring device 1 and the leg length measuring method of the present embodiment, the first shaft portion 11 is formed with the abdomen bending portion 16 that can be bent along the abdomen of the patient U. Therefore, the leg length LL, When measuring the LR, in addition to locking the end 11a of the first shaft portion 11 to the ends 2Lb and 2Rb of the upper anterior iliac spines 2L and 2R of the patient U, it curves in a convex shape toward the front side. The first shaft portion 11 can be stabilized, and the reference above the leg lengths LL and LR can be taken more accurately.

  As described above, according to the present invention, the position of the end of the rib 3 with respect to the end of the superior anterior iliac spine 2 can be accurately and objectively indicated. The present invention is not limited to the intermediate scene, and is not limited to the patient U who undergoes hip replacement, and can be applied in a wide range of fields that require measurement of leg lengths of all measurement subjects.

  The preferred embodiments of the present invention have been described in detail above. However, the present invention is not limited to the specific embodiments, and various modifications are possible within the scope of the gist of the present invention described in the claims. Deformation / change is possible.

  For example, in the above-described embodiment, the guide portion 14 configured by a plurality of line groups that extend in the first direction D1 and are formed at a constant interval in the second direction D2 has been described as an example. The form of 14 is not specifically limited. As a modified example, the guide unit 14 includes a detection unit 26 (not shown) that can detect the positions of the ends 3Lb and 3Rb of the placed ribs 3L and 3R, information input from the detection unit 26, The calculation unit 27 (not shown) for calculating the leg lengths LL and LR from information on the relative positions of the end portions 2Lb and 2Rb of the iliac spines 2L and 2R, and the leg lengths LL and LR calculated by the calculation unit 27 to the operator And a display unit 28 (not shown) for display.

  For the purpose of measuring the leg lengths LL and LR with extremely high accuracy, the leg length measuring device 1 is configured such that the left phantom line connecting the end 2Lb of the upper anterior iliac spine 2L and the end 3Lb of the rib 3L and the upper foregut. A function of detecting that the right imaginary line connecting the end 2Rb of the osteophyte 2R and the end 3Rb of the rib 3R is parallel along the second direction D2 may be provided. Thereby, the positions of the end portions 3Lb, 3Rb of the ribs 3L, 3R placed on the measurement unit 13 so that the left imaginary line and the right imaginary line are parallel along the second direction D2 are finely adjusted. The object of measuring the leg lengths LL and LR with extremely high accuracy can be reliably achieved.

  Moreover, in the above-mentioned embodiment, although the length adjustment part 19 provided between the 1st latching | locking part 20 and the 2nd latching | locking part 21 of the 2nd axial part 12 was illustrated and demonstrated, length adjustment was demonstrated. The form of the part 19 is not particularly limited. For example, the rod-like member 18 includes a further tubular member 18A (not shown) and a rod-like member 18B (not shown) that can be fitted in the tubular member 18A and disposed below the tubular member 18A. The length of the rod-shaped member 18 in the second direction D2 may be changed by moving the member 18B along the second direction D2 with respect to the cylindrical member 18A.

  In the above-described embodiment, the cylindrical member 17 and the rod-shaped member 18 have been described by exemplifying the second shaft portion 12 having a refracting portion from the first direction D1 to the second direction D2. When there is almost no difference in height between the end portions 2Lb, 2Rb of the superior anterior iliac spines 2L, 2R and the end portions 3Lb, 3Rb of the ribs 3L, 3R in the vertical direction D3 due to the body shape, posture at the time of surgery, etc. Each of the cylindrical member 17 and the rod-shaped member 18 does not have a refracting portion, and may be formed linearly along the second direction D2. In that case, since the rod-shaped member 18 inserted into the hollow portion 17s on the lower side of the tubular member 17 can move along the second direction D2, the connecting portion itself between the tubular member 17 and the rod-shaped member 18 is long. It functions as the thickness adjusting unit 19.

  In addition, even when the height difference between the ends 2Lb and 2Rb of the superior anterior iliac spines 2L and 2R and the ends 3Lb and 3Rb of the ribs 3L and 3R occurs in the vertical direction D3, as shown in FIG. The cylindrical member 17 and the rod-shaped member 18 may be formed linearly, or the cylindrical member 17 and the rod-shaped member 18 may be configured as an integral type. In other words, the second anterior iliac spine 2L, 2R to the ribs 3L, 3R may be configured by the second shaft portion 12 inclined in an oblique direction. A rotation mechanism 29 such as a hinge mechanism is provided between the rod-shaped member 18 and the length adjusting portion 19 so that the inclination angle of the second shaft portion 12 can be adjusted, and the length adjusting portion 19 is in the second direction. It may be arranged so as to be parallel to D2.

  Furthermore, the measurement unit 13 described in the above-described embodiment bends the left and right knees of the patient U in the supine position to the opposite side to the vertical direction D3 (that is, the front side of the patient U), and aligns both lower legs. The present invention can also be applied to the measurement of the knee position (so-called Alice sign).

  Specifically, as shown in FIG. 3, both knees of the patient U are bent to the opposite side to the vertical direction D <b> 3, and the ribs 3 </ b> L and 3 </ b> R are placed in the recess 13 u of the measurement unit 13. Thereby, when the lengths of both lower legs of the patient U are equal, the distances from the left and right upper anterior iliac spines 2L and 2R to the left and right patella 32L and 32R (so-called femur length) It is possible to check the difference between the left and right femur lengths and to measure the femoral length.

  In addition, after placing the ribs 3L and 3R in the concave portion 13u of the measurement unit 13 as described above, it is preferable that the pelvis of the patient U is horizontal. Generally, a soft mat (not shown) for preventing bed slippage may be laid on the bed B of the operating table, and the pelvis of the patient U in the supine position is circumferential with the second direction D2 as the central axis. There is a possibility of tilting. In that case, the second direction in the pelvis of the patient U is obtained by using the first shaft portion 11 as a reference in a state where the first shaft portion 11 is locked on the upper body surface (that is, the abdomen side). The angle with respect to the horizontal direction with D2 as the central axis (hereinafter referred to as the inclination angle of the pelvis of the patient U) can be confirmed. Then, the patient's U's pelvis can be arranged horizontally by rotating the operating table about the second direction D2 as a central axis in accordance with the tilt angle of the patient's U's pelvis (that is, tilting with respect to the horizontal direction). it can.

  Subsequently, the support body 30 provided with the gyro sensor 31 in advance is placed on both the left and right knees. If the positions of the knees when both lower legs are aligned are aligned with the ribs 3L and 3R, the support 30 is parallel to the first direction D1, that is, the horizontal direction (dashed line shown in FIG. 3). An angle θ with respect to the horizontal direction of the support 30 detected by the gyro sensor 31 is 0 °. Conversely, the position of the knee relative to the ribs 3L, 3R can be objectively and quantitatively measured by the angle θ detected by the gyro sensor 31. Further, as described above, by placing the pelvis of the patient U horizontally, the support body 30 is placed on both left and right knees in a state where the first shaft portion 11 is parallel to the floor. The angle θ can be measured more accurately using the gyro sensor 31. Accordingly, the difference between the left and right femur lengths of the patient U can be measured more accurately, and leg length correction measurement and the like can be performed based on the obtained difference in femoral length.

DESCRIPTION OF SYMBOLS 1 ... Leg length measuring apparatus 2, 2L, 2R ... Upper anterior iliac spine 11 ... 1st axial part 12 ... 2nd axial part 13 ... Measuring part 14 ... Guide part 16 ... Abdominal curve part 19 ... Length adjusting part 23 ... Plate -Like member 24 ... buttocks locking part

Claims (6)

A first shaft portion configured to be able to be locked to a pair of upper anterior iliac spines of a measurement subject;
One end is configured to be connectable to an end portion in the axial direction of the first shaft portion, and when connected, the first direction extends in a second direction orthogonal to the first direction parallel to the axial direction of the first shaft portion. A pair of second shaft portions provided near both ends of the one shaft portion;
The other end of the second shaft portion is configured to be connectable, arranged at the time of connection along the first direction, and configured to be able to place the measurement subject's buttocks, and the position of the buttocks A measurement unit provided with a guide unit capable of measuring
A leg length measuring device comprising: The measurement unit is composed of a plate-like member having a predetermined width dimension along the first direction and the second direction,
The guide portion is provided on a plate surface on which the measurement subject's buttocks can be placed in the plate-like member, and is formed at a certain interval in the second direction while extending in the first direction. The leg length measuring device according to claim 1, comprising a plurality of line groups.   The leg length measuring device according to claim 1 or 2, wherein the second shaft portion is provided with a length adjusting portion capable of adjusting a length dimension in the second direction.   The leg length measuring device according to any one of claims 1 to 3, wherein the measuring unit is provided with a hook locking part capable of locking the hook.   The leg length measurement according to any one of claims 1 to 4, wherein an abdomen bending portion that can be bent along the abdomen of the measurement subject is formed in the first shaft portion. apparatus. A leg length measuring method for measuring a leg length of a measurement subject using the leg length measuring device according to any one of claims 1 to 5,
Locking the first shaft to the pair of upper anterior iliac spines of the measurement subject;
Connecting one end of the second shaft portion to both ends in the axial direction of the first shaft portion;
Connecting the measuring part to the other end of the second shaft part;
Placing the measurement subject's buttocks on the measurement unit in a state in which the first shaft portion is locked to the upper anterior iliac spine, and measuring the position of the buttocks using the guide unit When,
A leg length measuring method comprising:

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