Hip resurfacing is an established treatment for osteoarthritis in young active patients. Failure modes include femoral neck fracture and prosthesis loosening, which may be associated with medium-term bone adaptation, including femoral neck narrowing and densification around the prosthesis stem. Finite element modelling was used to indicate the effects of prosthesis sizing and positioning on the...

The cementless Vektor hip prosthesis stem is made of a special titanium alloy (TiAI6Nb7), and has a three-dimensional conus and an optimal proximal anchoring property. The aim of this prospective study was to scrutinise the first clinical and radiographical experiences of this stem used in 206 total hip replacements. The mean age of the patients including 126 women and 80 men was 54.6 years (ra...

Introduction. Metallosis is a phenomenon most commonly associated with hip replacement. However it can occur in any metallic implant subject to wear. Wear creates metal debris, which is deposited in the surrounding soft tissue. This leads to many local adverse reactions including, but not limited to, implant loosening/osteolysis, pain, and effusion. In the deeper joints, for example, the hip, m...

Slipped capital femoral epiphysis occurs in adolescents, most often shortly after the onset of puberty. In patients suffering form renal osteodystrophy, the incidence is higher and the condition usually occurs at a younger age. Metabolic changes induce weakening of the bone, which makes the hip joint vulnerable. The initial treatment consists of phosphate-restricted diet, lanthanum carbonate, c...

We report the case of an acute hip septic arthritis caused by Gardnerella vaginalis in a 48-year-old woman under immunosuppressive therapy for kidney transplantation. After surgical resection of the hip and 6 weeks of combination antibiotic therapy, a total hip prosthesis was successfully implanted with no recurrence after 4 years.

In view of the fact that endo-prosthesis heads human hip-joint are operated in extreme conditions, respect load, selection corresponding material and also increase precision quality machining spherical surfaces is rather topical task. submitted work reviewed problems connected with definition influence degree orientation sapphire crystal on its workability during diamond grinding a butt ring el...

Dislocation of a total hip prosthesis is a painful and mentally stressful orthopaedic emergency.1 It may be long-standing and asymptomatic, typically involving the femoral portion.2-4 This report describes a peculiar chronic dislocation of both components of a total hip prosthesis. A 93-year-old female patient, thin and of short stature, had come to our attention for recent onset of lumbar pain...

Fifty-seven cemented total hip arthroplasties (THAs) were reviewed in cases of osteoarthrosis secondary to congenital dysplasia or dislocation. The bearing surface of the prosthesis used in this series consists of a polyethylene acetabular component on an alumina ceramic head. All acetabular components were positioned at the same level as the original acetabulum, and an autologous femoral head ...

Although prosthesis-bone micromotion is known to influence the stability of total hip replacement, no protocol exists to investigate resurfacing hip implants. An in-vitro protocol was developed to measure prosthesis-bone micromotions of resurfaced femurs. In order to assess the effect of all loading directions, the protocol included a variety of in-vitro loading scenarios covering the range of ...