Proteoglycan fragments in joint fluid. Influence of arthrosis and inflammation.

We determined the concentration of proteoglycan fragments in knee joint fluid collected from knee-ligament injured patients more than 6 months after the trauma and from patients with acute pyrophosphate arthritis and arthrosis or with arthrosis only. Injured patients with normal or only mildly altered cartilage at arthroscopy and with normal radiographs, had twice the average concentration of healthy volunteers. Other injured patients with advanced, radiographic signs of arthrosis, had synovial fluid proteoglycan fragment concentrations within the range of healthy volunteers.

Occlusive clothing and ultraviolet radiation in hip surgery.

In a randomized study of 20 total hip arthroplasties, the staff wore shirts and trousers of a fabric impervious to bacteria underneath operating gowns of a non-woven material. Volumetric air sampling demonstrated a low number of colony-forming units with this clothing, further reduced by ultraviolet radiation to below 10 colony-forming units/m3, the upper limit of "ultraclean air," in all the cases (median 2.6, range 1.

Incidence of meniscal lesions in children. Increase associated with diagnostic arthroscopy.

In the population of Malmö the average annual incidence of symptomatic meniscal lesions in children increased from 0.7 to 2.5 per 10,000 from 1960-1965 inclusive to 1980-1985 inclusive.

Osseointegration of metallic implants. II. Transmission electron microscopy in the rabbit.

In a material of 10 osseointegrated implants of pure titanium, Tivanium, Vitallium, and stainless steel, 23 interface areas were studied by transmission electron microscopy. The implant site was the upper tibia of mature rabbits, and the observation time was 11 months. The absence of a cellular reaction was verified.

Osseointegration of metallic implants. I. Light microscopy in the rabbit.

Thirty-eight adult albino rabbits received one implant of pure titanium and one implant of another, test, material in each tibia. The test materials were titanium-aluminum-vanadium alloy, chrome-cobalt alloy, and stainless steel. Observation times were 4 months and 11 months.

The ultrastructure of the tissue surrounding the Christiansen total hip.

Tissue samples obtained from 24 consecutive Christiansen total hip revision operations were examined with transmission electron microscopy. An abundance of wear particles of plastic, originating from the polyoxymethylene socket, were found in the periprosthetic tissue, where they induced fibrinoid necrosis and macrophage activation. Phagocytosing cells revealed degenerative signs of varying degrees.