Avascular necrosis of the femoral head (ANFH) is a pathologic process that results from interruption of blood supply to the femur bone resulting in the death of bone cells and collapse of the femoral head. Nontraumatic ANFH continuesto be a significant challenge to orthopedic surgeons. While the exact mechanisms remain elusive, many new insights have emerged from research in the last decade tha...

Osteonecrosis of the hip accounts for about 10% of all total hip arthroplasty cases and presents a significant challenge for those patients with and without femoral head collapse. Subtrochanteric femur fractures have been reported with numerous types of proximal femoral implants. Care must be taken to avoid penetrating the lateral cortex of the proximal femur inferior to the distal border of th...

BACKGROUND Although periprosthetic fractures of the femur are a recognized complication of total hip arthroplasty, periprosthetic fractures of the acetabulum are rare. Simultaneous periprosthetic fractures of both the acetabulum and the femur have not been reported, to our knowledge. CASE REPORT We report a simultaneous fracture of the acetabulum and the femur in a 68-year-old female patient wh...

Mechanical factors have a strong influence on the growth and development of the skeleton [1], [2]. Forces acting on the growing bones play an important role in their forming process. Disturbances of such loadings in the prenatal period as well as during infancy and childhood can lead to serious developmental deformities [3]. Proximal end of the femur is one of the main parts of the hip joint. T...

BACKGROUND The aim of this study was to develop and perform the 3D finite element analysis of a femoral head interior supporting device (FHISD). MATERIAL AND METHODS The 3D finite element model was developed to analyze the surface load of femoral head and analyze the stress and strain of the femoral neck, using the normal femoral neck, decompressed bone graft, and FHISD-implanted bone graft m...

Luxation is relatively infrequent in bovine species because cattle generally have bulky muscle and strong periarticular ligaments and tendons, but cases do occur owing to sudden abnormal stresses in some joints [1]. One of the common sites is the coxofemoral joint, which has anatomic configurations that predispose to luxation. The relatively small head of the femur, minimal attachment of the fe...

Leptohyphes cornutus Allen from Brazil (Santa Catarina) and Misiones, Argentina is re-studied from new material and newly diagnosed as follows: tubercles on head (two pairs), pronotum (two pairs, anterior pair very small), and mesonotum (two pairs), abdominal terga without paired tubercles, nor remnants of them; fore femur length/maximum width, 1.4-1.8; tarsal claws denticulation 4-11+1; hind w...

Avascular necrosis (AN) is the death of trabecular bone and marrow, and is primarily observed in femur head. The pathogenesis is believed to be caused by the ischemia that occurs with the deterioration of micro-circulation in the femoral head.17 The annual US incidence of AN is between 10,000 and 15,000. The disease most commonly emerges in young adults, with an average age of 38 years. Prognos...

Avascular necrosis of the femoral head is usually seen in children aged 1.5 to 10 years, reaching a peak incidence between the ages of 4 and 9. Avascular necrosis of the femoral head is a known complication of corticosteroid therapy in acute lymphoblastic leukemia. There are few reports in the literature regarding the natural history of this condition, and there is no consensus on its managemen...

OBJECTIVE The purpose of this study was to establish longitudinal reference ranges for fetal ultrasound biometry measurements and growth parameters in twin pregnancies. METHOD A total of 200 uncomplicated twin pregnancies before 21 weeks of gestation were recruited for this prospective, longitudinal study. Women who abandoned follow-up, pregnancies with unknown outcomes or pregnancies with co...