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The generation and transmission of forces under the foot was investigated in 67 normal subjects and 124 patients with rheumatoid arthritis. The investigations included the measurement of static foot-ground pressure patterns with a Pedobarograph and the assessment of transmission of maximum load during the gait cycle with instrumented force sandals.(More)
Oscillating saws and rotary drills are the most common instruments used in orthopaedic surgery for the cutting of bone and the drilling of holes through the cortex in preparing surfaces for implants to be placed on the bone ends. To obtain precision of placement of the surfaces and holes, various techniques have been developed to guide the instruments,(More)
The plastic components of 280 retrieved unicondylar and total knee arthroplasties were studied. Wear was visually scored using a relative ranked data method. Although wear on the components was highly variable, several conclusions could be drawn regarding the nature and causes. Wear was associated more with the medial than the lateral condyle. Delamination(More)
Eighteen New Zealand white rabbits underwent prosthetic replacement of the meniscus which was attached to the intercondylar area of the tibia through a predrilled hole and around the internal surface of the capsule by sutures, in one knee, and meniscectomy alone in the contralateral knee. The animals were killed 3 and 6 month after implantation.(More)
A series of 26 patients was studied before and after total knee replacement to determine the change in their quality of life, expressed as a gain in Quality Adjusted Life Years (QALYs). Global health status was assessed using the Nottingham Health Profile, disability by the Harris scale, pain by the McGill Pain Questionnaire, and anxiety and depression by(More)
Twenty-seven patients who had hip arthroplasty operated on with trochanteric osteotomy were compared with 54 patients when the direct lateral approach was used. The strength of the hip abductors, adductors, extensors, and flexors were measured at least 2 years following surgery. The strength of these muscle groups recovered to the same level as those on the(More)
In this scanning electron microscopic study blocks of collagen fibrils were prepared from human articular cartilage, using two techinques which selectively removed either the proteoglycans alone, or both the proteoglycans and the collagen fibrils, of the non-calcified cartilage layer. Amino acid analysis of the fibrils confirmed the purity of the collagen(More)
A 3-component sliding meniscus knee prosthesis was tested mechanically to evaluate the direct loads and the anteroposterior and mediolateral bending moments on the prosthetic components during the loading phase on a pendulum prosthesis testing machine. The bending moments changed with variation of the component positions. Tilting the tibial plateau produced(More)