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Biomedical subjects

E L Radin

Publications and source records attributed to E L Radin.

At least 91 records · Page 5Linked to original sources
PubMed1975

"Stiction-friction" of total hip prostheses and its relationship to loosening.

The static friction, or "stiction-friction", in McKee-Farrar and Charnley-Müller prostheses in a hip joint simulator was compared with dynamic friction determined while the prostheses were oscillated. Under physiological conditions stiction-friction differed little from dynamic friction in both metal-on-metal and metal-on-plastic prostheses, and was affected very little by the lubricant as long as some fluid was present. Stiction-friction increased significantly only after relatively long stationary periods and high loads. However, the frictional forces generated in total hip-replacement prostheses were at least forty times higher than those generated in normal joints and may well be enough to cause late loosening of acetabular components by fatigue failure.

Acetabulum↗
PubMed1975

Rationale and indications for the "hanging hip" procudure: a clinical and experimental study.

A series of 71 patients treated by "hanging hip" procedures was followed for up to 12 years. The procedure provided a satisfactory result in patients even with severe hip joint degeneration as long as the congruity of the joint is preserved and there was no concentration of stress. When these conditions are not fulfilled the results are poor. An experimental study was carried out to try and ascertain the physiological rationale for the "healing" seen in patients with good preoperative indications. The articular cartilage of one hip in cats was denuded with a curette. This was accompanied in half the animals with a "hanging hip" procedure. The hips of the animals with "hanging hip" went onto fibrocartilaginous and chondroid healing of their articular surfaces and clinically did well. The hips of the animals who did not have multiple tenotomies developed osteoarthrosis. Full thickness cartilage defects in weight-bearing areas in adult animals are capable of functional healing if the mechanical stress on the joint is sufficiently decreased. The "hanging hip" operation should no longer be considered a salvage procedure. A physiological rationale exists for it in properly selected patients and represents a reasonable alternative to total hip replacement.

Adolescent↗
PubMed1973

Mechanical resonance spectra in human cancellous bone.

The dynamic mechanical response of fresh human cancellous bone at low audio frequencies contains two resonance spectra. The spectral frequencies in each series have the ratios 1:4:9:16 ... n(2). The frequencies are in quantitative agreement with the concept of momentum wave modes of calcium and phosphorus atoms in the lamellae, with no variable parameters.

Adult↗