Veterinary and comparative orthopaedics and traumatology, 2017
To evaluate the torsional properties of the Targon(®) Vet Nail System (TVS) in small canine femur... more To evaluate the torsional properties of the Targon(®) Vet Nail System (TVS) in small canine femurs and to compare these properties to those of the 2.4 mm LC-DCP(®) plates. Thirty-six cadaveric femurs were allocated to three groups (n = 12). In all bones, points just distal to the lesser trochanter and just proximal to the fabellae were marked and a midshaft transverse osteotomy was performed. Group 1: bones were fixed with the 2.5 mm TVS with the bolts applied at the pre-identified marks. Group 2: A TVS system with 25% shorter inter-bolt distance was used. Group 3: A 7-hole 2.4 mm LC-DCP(®) plates were applied. All constructs were tested non-destructively for 10 cycles, followed by an acute torsion to failure. Torque at yield was 0.806 ± 0.183 and 0.805 ± 0.093 Nm for groups 1 and 2 and 1.737 ± 0.461 Nm for group 3. Stiffness was 0.05 ± 0.01, 0.05 ± 0.007, and 0.14 ± 0.015 Nm/° for groups 1 to 3 respectively. Maximal angular displacement under cyclic loading was 16.6° ± 2.5°, 15.6° ± 2.1°, and 7.8° ± 1.06° respectively. There was no significant difference for any of the parameters between groups 1 and 2. Both torque at yield and stiffness were significantly greater between group 3 and groups 1 and 2. The TVS had approximately half the torsional strength and approximately 1/3 of the stiffness of the 2.4 mm bone plate. Slippage of the locking mechanism was probably the cause of the early failure. The system should be considered as a low-strength and low-stiffness system when compared to bone plates.
O presente trabalho relata um caso de MG em um felino de seis meses de idade. A Miastenia gravis ... more O presente trabalho relata um caso de MG em um felino de seis meses de idade. A Miastenia gravis (MG) e uma desordem de transmissao neuromuscular resultante de deficiencia ou disturbio funcional do receptor de acetilcolina nicotinico congenita ou auto-imune. Em ambos os casos, o resultado e fraqueza muscular focal ou generalizada. A MG e uma doenca rara que tem sido relatada em apenas algumas racas de caes, particularmente rara em gatos. Foi atendido um felino, macho, exotico, seis meses de idade com quadro de paralisia flacida de membros posteriores.
Vertebral and spinal cord trauma are common conditions in small animal practice and often result ... more Vertebral and spinal cord trauma are common conditions in small animal practice and often result in vertebral fractures/luxation (VFL) with concomitant spinal cord laceration, concussion, compression, or ischemia. These lesions have several clinical presentations that may vary from moderate to severe pain and partial to total loss of motor, sensory, and visceral functions, which may result in death or euthanasia. Our purpose is to describe five cases (four dogs and one cat) of complications secondary to the use of bone cement for vertebral stabilization. The patients, between five months and four years of age and weighing between 1.4 and 12.2 kg, were referred to the Small Animal Orthopedics and Traumatology Service of the Veterinary Hospital of the College of Veterinary Medicine and Animal Science of the University of São Paulo. They had a history of post-operatory polymethyl methacrylate (PMMA) reactions (such as drainage or cement exposure due to infection or implant failure) in ...
Background: Humeral fractures account for 13% of all fractures in cats and commonly affect the mi... more Background: Humeral fractures account for 13% of all fractures in cats and commonly affect the middle diaphysis and supracondylar region with comminution. They are usually the result of high energy traumas such as falls, car accidents and firearm injuries. There are few treatment options for these types of fractures and since they are joint injuries, early surgical repair is mandatory to achieve perfect anatomical reduction, to maintain joint congruence and to allow early weight bearing. Our purpose is to report four subacute and chronic fractures of the distal diaphysis associated with comminuted supra and intercondylar fractures, stabilized with transarticular external skeletal fixator in three domestic felines.Cases: (1)- A 3-year-old male docile Siamese cat with 3.7 kg of body weight was presented for consultation with a 14-day history of high rise syndrome after falling from a 12-meter high. It presented distal comminuted humeral fracture that involved the inter and supracondyl...
Veterinary and comparative orthopaedics and traumatology, 2017
To evaluate the torsional properties of the Targon(®) Vet Nail System (TVS) in small canine femur... more To evaluate the torsional properties of the Targon(®) Vet Nail System (TVS) in small canine femurs and to compare these properties to those of the 2.4 mm LC-DCP(®) plates. Thirty-six cadaveric femurs were allocated to three groups (n = 12). In all bones, points just distal to the lesser trochanter and just proximal to the fabellae were marked and a midshaft transverse osteotomy was performed. Group 1: bones were fixed with the 2.5 mm TVS with the bolts applied at the pre-identified marks. Group 2: A TVS system with 25% shorter inter-bolt distance was used. Group 3: A 7-hole 2.4 mm LC-DCP(®) plates were applied. All constructs were tested non-destructively for 10 cycles, followed by an acute torsion to failure. Torque at yield was 0.806 ± 0.183 and 0.805 ± 0.093 Nm for groups 1 and 2 and 1.737 ± 0.461 Nm for group 3. Stiffness was 0.05 ± 0.01, 0.05 ± 0.007, and 0.14 ± 0.015 Nm/° for groups 1 to 3 respectively. Maximal angular displacement under cyclic loading was 16.6° ± 2.5°, 15.6° ± 2.1°, and 7.8° ± 1.06° respectively. There was no significant difference for any of the parameters between groups 1 and 2. Both torque at yield and stiffness were significantly greater between group 3 and groups 1 and 2. The TVS had approximately half the torsional strength and approximately 1/3 of the stiffness of the 2.4 mm bone plate. Slippage of the locking mechanism was probably the cause of the early failure. The system should be considered as a low-strength and low-stiffness system when compared to bone plates.
O presente trabalho relata um caso de MG em um felino de seis meses de idade. A Miastenia gravis ... more O presente trabalho relata um caso de MG em um felino de seis meses de idade. A Miastenia gravis (MG) e uma desordem de transmissao neuromuscular resultante de deficiencia ou disturbio funcional do receptor de acetilcolina nicotinico congenita ou auto-imune. Em ambos os casos, o resultado e fraqueza muscular focal ou generalizada. A MG e uma doenca rara que tem sido relatada em apenas algumas racas de caes, particularmente rara em gatos. Foi atendido um felino, macho, exotico, seis meses de idade com quadro de paralisia flacida de membros posteriores.
Vertebral and spinal cord trauma are common conditions in small animal practice and often result ... more Vertebral and spinal cord trauma are common conditions in small animal practice and often result in vertebral fractures/luxation (VFL) with concomitant spinal cord laceration, concussion, compression, or ischemia. These lesions have several clinical presentations that may vary from moderate to severe pain and partial to total loss of motor, sensory, and visceral functions, which may result in death or euthanasia. Our purpose is to describe five cases (four dogs and one cat) of complications secondary to the use of bone cement for vertebral stabilization. The patients, between five months and four years of age and weighing between 1.4 and 12.2 kg, were referred to the Small Animal Orthopedics and Traumatology Service of the Veterinary Hospital of the College of Veterinary Medicine and Animal Science of the University of São Paulo. They had a history of post-operatory polymethyl methacrylate (PMMA) reactions (such as drainage or cement exposure due to infection or implant failure) in ...
Background: Humeral fractures account for 13% of all fractures in cats and commonly affect the mi... more Background: Humeral fractures account for 13% of all fractures in cats and commonly affect the middle diaphysis and supracondylar region with comminution. They are usually the result of high energy traumas such as falls, car accidents and firearm injuries. There are few treatment options for these types of fractures and since they are joint injuries, early surgical repair is mandatory to achieve perfect anatomical reduction, to maintain joint congruence and to allow early weight bearing. Our purpose is to report four subacute and chronic fractures of the distal diaphysis associated with comminuted supra and intercondylar fractures, stabilized with transarticular external skeletal fixator in three domestic felines.Cases: (1)- A 3-year-old male docile Siamese cat with 3.7 kg of body weight was presented for consultation with a 14-day history of high rise syndrome after falling from a 12-meter high. It presented distal comminuted humeral fracture that involved the inter and supracondyl...
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