Biomechanical evaluation of a new femoral stem design for total hip replacement in a canine model

ABSTRACT Purpose To evaluate the biomechanical properties of a novel total hip replacement femoral stem. Methods Eight pairs of femurs from dog cadavers were used. The femurs were separated into different groups. A novel femoral stem with a convex proximal portion (Stem B) was biomechanically evaluated and compared to awell-known veterinary collared stem (Stem A). Femoral stems were inserted into the contralateral femurs from the same dog, forming 16 constructs. A flexo-compression load was applied on the axial axis of each sample. Maximum strength, deflection, stiffness, and energy absorption were analysed. Results Group B constructs showed significantly higher values (p ? 0.05) for the variables, except stiffness. The mean maximum strength was 1,347 ± 357 N for Group A and 1,805 ± 123 N for Group B (p ? 0.0069). The mean deflection was5.54 ± 2.63 mm for Group A and 10.03 ± 3.99 mm for Group B (p ? 0.0056). For the energy variable, the force was 6,203 ± 3,488 N/mm for Group A and 12,885 ± 5,056 N/mm for Group B (p ? 0.0054). Stem B had greater maximum strength, deflection, and energy. Conclusions The new stem was effective in neutralizing the impact of axial flexion-compression stresses during biomechanical tests in cadaveric models.

Limb-sparing using total hip arthroplasty in a dog with femoral head osteosarcoma

Background: Osteosarcoma (OSA) is the most common primary bone tumor of the appendicular skeleton of dogs. Itmainly affects the metaphyseal region of long bones in large and giant breed dogs.The markedly aggressive and metastaticcharacter of the disease leads to an invariably poor to unfavorable prognosis.Although amputation is commonly performed,different surgical techniques may be used to preserve the limb. The most common methods of limb preserving surgeriesinvolve the use of endoprosthesis and allogeneic or autologous grafts. This report describes the successful use of total hipreplacement to treat a 3-year-old male dog, with OSA in the femoral head and neck.Case: This report describes the successful use of total hip replacement to treat a 3-year-old male dog, with OSA in thefemoral head and neck. The OSA stage IA located in the femoral head and neck was resected and treated through thelimb-sparing. The bone defect and joint function was reconstructed with total hip arthroplasty technique using a cementlesship prosthesis. The result of the histopathological analysis of the excised bone tissue showed a minimally productiveosteoblastic osteosarcoma. To date, the patient shows satisfactory movement rate and motion range, with no pain to palpationand without lameness in that limb. The radiographic follow-up after 24 months showed no local recurrence, metastasispulmonary or complications related to the implant. Total hip arthroplasty resulted in safe recovery of orthopedic signsassociated with osteosarcoma of the femoral head and neck [...]

Limb-sparing using total hip arthroplasty in a dog with femoral head osteosarcoma

Background: Osteosarcoma (OSA) is the most common primary bone tumor of the appendicular skeleton of dogs. Itmainly affects the metaphyseal region of long bones in large and giant breed dogs.The markedly aggressive and metastaticcharacter of the disease leads to an invariably poor to unfavorable prognosis.Although amputation is commonly performed,different surgical techniques may be used to preserve the limb. The most common methods of limb preserving surgeriesinvolve the use of endoprosthesis and allogeneic or autologous grafts. This report describes the successful use of total hipreplacement to treat a 3-year-old male dog, with OSA in the femoral head and neck.Case: This report describes the successful use of total hip replacement to treat a 3-year-old male dog, with OSA in thefemoral head and neck. The OSA stage IA located in the femoral head and neck was resected and treated through thelimb-sparing. The bone defect and joint function was reconstructed with total hip arthroplasty technique using a cementlesship prosthesis. The result of the histopathological analysis of the excised bone tissue showed a minimally productiveosteoblastic osteosarcoma. To date, the patient shows satisfactory movement rate and motion range, with no pain to palpationand without lameness in that limb. The radiographic follow-up after 24 months showed no local recurrence, metastasispulmonary or complications related to the implant. Total hip arthroplasty resulted in safe recovery of orthopedic signsassociated with osteosarcoma of the femoral head and neck [...](AU)

Artroplastia total de quadril cimentada com sistema modular: relato em 16 cães / Cemented total hip replacement with modular system: report in 16 dogs

A displasia coxofemoral é uma desordem ortopédica que acomete principalmente cães. Esta é a principal indicação para a artroplastia total de quadril (ATQ). O presente trabalho procurou avaliar a ATQ cimentada com sistema modular em 15 cães com artrose secundaria a displasia coxofemoral, e em um cão portador de luxação coxo femoral utilizando material de fabricação nacional. O procedimento mostrou-se eficaz no retorno completo da função do membro na maioria dos animais operados.(AU)

The hip dysplasia is an orthopedic disease that affects mainly dogs. That is the principal indication for total hip replacement (THR). The present paper evaluated the cemented total hip replacement with modular system in 15 dogs with degenerative joint disease secondary to hip dysplasia and one dog bearer of dislocated hip by using material of manufacture national. The procedure showed to be effective into the complete return to the limb function of the most operated animals.(AU)

Artroplastia total de quadril cimentada com sistema modular: relato em 16 cães / Cemented total hip replacement with modular system: report in 16 dogs

A displasia coxofemoral é uma desordem ortopédica que acomete principalmente cães. Esta é a principal indicação para a artroplastia total de quadril (ATQ). O presente trabalho procurou avaliar a ATQ cimentada com sistema modular em 15 cães com artrose secundaria a displasia coxofemoral, e em um cão portador de luxação coxo femoral utilizando material de fabricação nacional. O procedimento mostrou-se eficaz no retorno completo da função do membro na maioria dos animais operados.

The hip dysplasia is an orthopedic disease that affects mainly dogs. That is the principal indication for total hip replacement (THR). The present paper evaluated the cemented total hip replacement with modular system in 15 dogs with degenerative joint disease secondary to hip dysplasia and one dog bearer of dislocated hip by using material of manufacture national. The procedure showed to be effective into the complete return to the limb function of the most operated animals.