Search results for "Femoral head"
showing 10 items of 20 documents
Histopathological and immunohistochemical aspects of bone tissue in aseptic necrosis of the femoral head
2021
Femoral head osteonecrosis, also known as avascular necrosis, is a disease with a multifactorial etiology, characterized by a profound change of bone architecture, which leads to the diminishing of bone resistance and femoral head collapse. The main causes that lead to femoral head necrosis are represented by the decrease of local blood perfusion and increase of intraosseous pressure, because of an excessive development of adipose tissue in the areolas of the trabecular bone tissue in the femoral head. The histopathological and immunohistochemical (IHC) study performed by us showed that most of bone trabeculae were damaged by necrotic-involutive processes, their sizes being reduced, both re…
Experimental investigations about the stability of the spongiosa of the femoral head, a new angle plate in mind
1990
Im Hinblick auf den Trochanter-major-Abbruch bei und nach Winkelplattenosteosynthesen von pertrochanteren Frakturen wurde zu Versuchszwecken eine 130o-Winkelplatte mit lediglich 6 mm breitem Klingenprofil angefertigt, bei der das notwendige Knochenfenster die laterale Femurkortikalis weniger schwacht. Die Fragestellung war, ob diese Plattenklinge hinsichtlich der Tragfahigkeit des Osteosynthesesystems vergleichbar stabil in der Spongiosa des Huftkopfes verankert werden kann wie die herkommliche 130o-Winkelplatte. Dazu wurden an Knochenpraparaten vergleichende Druckbelastbarkeitsversuche, von pertrochanteren Osteotomien durchgefuhrt. Die Ergebnisse zeigen, das die neuartige Klinge mit dem sc…
Earlier appearance of the ossification center of the femoral head in breast-fed versus formula-fed infants
2011
Abstract Objective The aim of this study was to evaluate possible differences in the rate of appearance of the femoral head ossification center (FHOC) in infants according to the type of feeding (exclusive breast-feeding, formula, mixed feeding). Methods A retrospective study was conducted in a population of 285 healthy infants who consecutively underwent echographic evaluation of the hip as a screening for hip dysplasia from April 1 through October 31, 2008. For each infant, type of feeding, sex, gestational age, weight at birth, and age at the time of echographic examination were recorded. Data analysis was performed in the entire sample population and in a subpopulation of 143 infants af…
Short-term effect of zoledronic acid upon fracture resistance of the mandibular condyle and femoral head in an animal model
2013
Objective: The aim of this study was to compare the effects in terms of resistance to fracture of the mandibular condyle and femoral head following different doses of zoledronic acid in an animal model. Study design: A total of 80 adult male Sprague-Dawley rats were included in a prospective randomized study. The animals were randomly divided into four groups of 20 rats each. Group 1 (control) received sterile saline solution, while groups 2, 3 and 4 received a accumulated dose of 0.2 mg, 0.4 mg and 0.6 mg of zoledronic acid, respectively. The animals were sacrificed 28 days after the last dose, and the right hemimandible and the right femur were removed. The fracture strength was measured …
Bone mineral density of the proximal femur after hip resurfacing arthroplasty: 1-year follow-up study
2011
Abstract Background Hip resurfacing arthroplasty (HRA) is considered a bone-preserving procedure and may eliminate proximal femoral stress shielding and osteolysis. However, in addition to implant-related stress-shielding factors, various patient-related factors may also have an effect on bone mineral density (BMD) of the proximal femur in patients with HRA. Thus, we studied the effects of stem-neck angle, demographic variables, and physical functioning on the BMD of the proximal femur in a one-year follow-up. Methods Thirty three patients (9 females and 24 males) with a mean (SD) age of 55 (9) years were included in the study. BMD was measured two days and 3, 6, and 12 months postoperative…
Pathogenesis and prophylaxis of circulatory reactions during total hip replacement
1993
Circulatory reactions such as a drop in blood pressure, bradycardia, cardiac arrest, and even intraoperative death after insertion of the stem are well known events during total hip replacement. The present paper reports bone marrow intravasation after rise of intramedullary pressure in the femoral cavity during insertion of hip prostheses, demonstrated by intraoperative transesophageal echocardiography. In an animal study, the ultrasound echoes were identified as "mixed emboli" consisting of a core of bone marrow surrounded by thrombus. These results suggested the use of an intramedullary plug to restrict the intravasation of bone marrow. A trial was undertaken in 60 total hip replacement …
Der HEPFIEx-Simulator, eine Apparatur zur Bestimmung der Reibzahlen zwischen Hüftkopf-Prothesen und Knorpel / The HEPFlEx Simulator, a Device for Mea…
2002
We describe a device designed to investigate friction between various femoral head prostheses and human acetabula. It enables not only the determination of friction and the relevance of the play between the femoral head and acetabulum, but also the evaluation of the kinematic behaviour of bipolar prostheses. In the simulator, the various femoral head prostheses are placed on a special cone and tested against a human cadaveric acetabulum. The swiveling range of the device is uniaxial, and the swiveling angle is +/- 35 degrees. The maximum force produced pneumatically is 5kN. Testing of the simulator with a TEP was successful and friction-coefficients of < 0.1 were measured, as are reported i…
The Artek cup for total hip replacement of dysplastic hip joints.
2003
One specific difficulty in total hip replacement for developmental dysplasia of the hip is a shallow acetabulum with a short anteroposterior diameter. In a prospective cohort study we investigated the short-term results of the Artek cup, designed with a shallow outline and a height-reduced metal inlay for a large size 38 mm metal head, in a group of female patients with mild dysplasia of the hip.Fourteen consecutive patients with 17 dysplastic hip joints were included in the study. Their average age was 42 years. Fourteen hips had dysplasia Crowe grade I; 3 hips had dysplasia Crowe grade II. The femoral head centre was localized according to Pagnano in zone 1 in 3 cases, in zone 3 in 6 case…
Long-term results after operative treatment of femoral neck fractures with ceramic head prostheses.
2001
ABSTRACT From 1 985-1 990, a total of 277 elderly patients underwent hemiarthroplasty using a ceramic head prosthesis. Average patient age was 81.7 years. Of these, 77 patients were available for follow-up examination in 1993. A standardized score was calculated assessing activity, gait, and hip pain; the average score was 58 out of 78 possible points. Three patients had hip pain, and in 4 patients, radiographic examination revealed protrusio acetabuli. Two of 4 patients underwent revision surgery for replacement of the cup, leaving the stem in situ. Because of the small number of prosthetic-related complications, hemiarthroplasty using a ceramic head prosthesis is the recommended surgical …