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At least 955 records · Page 53Linked to original sources
PubMedDate not supplied

Load testing of geometric and polycentric total knee replacements.

Static loading of implanted geometric and polycentric knee replacements was conducted in order to define fixation characteristics and load capabilities of the prostheses and the bone prostheses interface. Failures occurred in some specimens at load levels normally encountered across the knee joint during ambulation. Disruption of the tibial bone-cement interface and crushing of the tibial plateau were the modes of failure. There was no failure on the femoral side of the joint. The major determinants of stress failure suggested by this study were: (1) the tibial bone strength, (2) the design of the geometric and polycentric tibial component, and (3) method of component implantation.

Aged↗
PubMed2003

Metacarpophalangeal joint arthroplasty in rheumatoid arthritis.

In patients with rheumatoid arthritis, metacarpophalangeal joint deformities can significantly affect hand function. Flexible hinge implant arthroplasty, designed in the 1960s, remains the most accepted and widely performed technique for treatment of severely involved metacarpophalangeal joints in rheumatoid arthritis. An arc of motion of 40 degrees to 60 degrees can be expected after arthroplasty, with improvement of finger extension and ulnar deviation. Silicone implant arthroplasty, although technically challenging, is the standard surgical procedure for improving hand function in these patients. Complications include recurrent ulnar deviation, extensor lag, implant fracture, infection, and silicone-induced particulate synovitis. Despite these limitations, patient satisfaction is high with enhancement of hand appearance and function and relief of pain.

Arthritis, Rheumatoid↗
PubMed1976

Secondarily infected total joint replacements by hematogenous spread.

Three fatal cases of infections that followed total joint replacement are repoarted, in each of which a hematogenous source of infection was identified. There also were five non-fatal cases presumable arising hematogenously which were reported in the literature. It is emphasized that concomitant disease, including active rheumatoid arthritis, may predispose to this complication.

Abscess↗
PubMedDate not supplied

[Normal gait and its changes after total arthroplasty of the lower extremity. Study on 200 subjects of the support phase of the step and its impulse].

The authors have studied the normal gait of 50 individuals using a dynamometric platform. Measurements have been made of the impulse at each step, the weight bearing phase and the forces transmitted by the foot to the floor. The results have been compared with those obtained from a study of the gait of 150 patients treated by total prostheses (133 hips, 10 knees, 7 ankles). This type of study leads to a better appreciation of operative results.

Aged↗
PubMed1992

[The treatment of rigid hallux using Swanson's silastic implant (single and double stem). Clinical, radiological and podobarographic review with a 16-year maximum follow-up].

Twenty-eight cases of hallux rigidus treated with the Swanson Silastic implant (single and double stem) were reviewed, with an 8-year follow-up. The skin complication rate was significant. Long-term patient satisfaction was good. Radiologic findings were alarming: implants seem to wear out quickly on the articular side, and granulomatous reactions develop around the stems. Dynamic pedobarography shows decreased pressure under the first ray, with transfer of the weight to the midmetatarsal heads, sometimes on the external edge of the foot. The authors review the international literature on the etiology, pathology and treatment of hallux rigidus. Surgical indications and techniques are specified.

Adult↗
PubMed2003

The lubricative function of artificial joint material surfaces by confocal laser scanning microscopy. Comparison with natural synovial joint surface.

The purpose of this study was to observe and compare the effect of the behavior of different lubricating surfaces, including articular cartilage and several artificial joint materials, under the physiological loading by confocal laser scanning microscopy (CLSM) to clarify the mechanism of lubrication in natural joints and subsequently improve the quality of artificial joints. In our experiment, even with considerable loading, natural articular cartilage exhibited a synovial fluid area and an area of direct and solid contact. In the region between these two areas, a liquid crystal layer was observed. On the other hand, the materials used for artificial joints (metal and polyethylene, which are now in use, and polyvinyl alcohol-hydrogel polymer which is being developed), did not exhibit neither a clear fluid pool area nor the intermediary area with liquid crystal formation. These results suggest that natural articular cartilage surface has a particular characteristic which builds up a synovial pooling area and liquid crystal formation in the third area by interaction with macromolecules in synovial fluid under the loading condition. These characteristics give natural articular cartilage its excellent lubricative function. To improve the quality of artificial joints, the characteristics of the implant material surface and the synovial macromolecules must be considered.

Animals↗