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Results for “HIP JOINT”

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At least 1,315 records · Page 73Linked to original sources
PubMed1998

A comparative tribological study of the wear of composite cushion cups in a physiological hip joint simulator.

A composite cushion acetabular cup for a total hip replacement has been designed and developed jointly by Leeds University and DePuy International. In order to assess the long-term performance of this novel design, two sets of simulator tests of more than 4 million cycles duration have been carried out with the cushion bearings using the Leeds PA hip joint simulator with bovine serum as the lubricant. The results of these simulator tests were compared to the results from a previously reported study that used 32 mm ultrahigh molecular weight polyethylene (UHMWPE) acetabular cups. Under a physiological walking cycle simulation, with continuous cyclic motion and loading, the composite cushion cups produced negligible wear compared to a volumetric wear rate of 32 mm3 per million cycles for the conventional UHMWPE acetabular cups. This study has demonstrated for the first time the beneficial effects of fluid film lubrication in reducing wear in composite cushion acetabular cups.

Animals↗
PubMed1996

Comparison of the size and morphology of UHMWPE wear debris produced by a hip joint simulator under serum and water lubricated conditions.

This paper investigates the effect of lubricant on the size and morphology of ultra-high molecular weight polyethylene (UHMWPE) wear debris produced by a hip joint simulator. Bovine serum and water were chosen as the lubricants for comparison. When bovine serum was used as lubricant, the majority of the wear debris produced was submicron sized and equiaxed or elongated in shape; no transfer film was found on the femoral heads. When water was used as lubricant, large pieces of thin UHMWPE flakes about 2-3 mm across were produced and patches of transfer films were observed on the femoral heads. These large flakes were comprised of numerous smaller thin flakes compacted together. While the size and shape of the wear debris produced with serum lubrication are similar to those reported from clinical studies in total hip replacement, the debris produced with water lubrication bears no resemblance to what has been seen clinically.

Animals↗
PubMed1998

[Vacuum phenomenon in the hip joint: diagnostic value].

Vacuum phenomenon is well known in degenerative spinal disease in the elderly, but is seldom seen in other joints, especially in children. The phenomenon does not represent a pathological finding, and can be used for imaging of the articular facets, mainly in the hip and knee joints. We report a patient with this phenomenon in the hip joint.

Arthrography↗
PubMedDate not supplied

[Surgical technical treatment of the acetabulum in hip joint replacement. Evaluation of an acetabulum-preserving surgical technic based on a 10-year follow-up study].

The results of a 10-year follow-up examination of acetabular components in hip joint replacement following a protective acetabulum operating technique are demonstrated. With the exception of 4 cases in which during the operation the integrity of the acetabulum was not sufficiently observed, 90 per cent of the acetabular implants were on hand from x-rays fully integrated. A remarkable bone cement demarcation was to be found only in 10 per cent but there were no signs of loosening. The authors emphasize a protective acetabulum operating technique with special care to avoid the weakening of carrying structures of the acetabulum.

Acetabulum↗
PubMed1990

Ultrastructural study of hip joint osteoarthritis. Scanning electron microscopic study of articular cartilage of femoral head.

The surface structure of four different articular cartilages of the femoral head was studied with scanning electron microscope in 12 cases of hip joint osteoarthritis. These articular cartilages were mink white, yellow, dusky red and hyperplastic and thickened. The osteoarthritic articular cartilage surface was uneven with puckerings of various height, width and orientation. The puckerings were covered with fibril network. The fibrils were exposed collagen fibrils and of different diameters. Wider fiber bundles without orientation were found on the fibril network. On the surface of the hyperplastic articular cartilage observed were many deep and oval spaces left behind after breakdown of the lacunae of cells in the clusters of articular chondrocytes. In the spaces, remnants of articular chondrocytes were seen.

Cartilage, Articular↗