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Biomedical subjects

S D Stulberg

Publications and source records attributed to S D Stulberg.

63 records · Page 4Linked to original sources
PubMed1981

The natural history of Legg-Calvé-Perthes disease.

Two groups of patients who had Legg-Calvé-Perthes disease were studied. The first group of patients consisted of eighty-eight patients (ninety-nine affected hips) followed in three hospitals for an average of forty years. The second group consisted of sixty-eight patients (seventy-two affected hips), all of whose radiographs from the onset of disease to maturity were available and all of whom had been treated in one hospital. The patients in this second group were followed for an average of thirty years. Each hip in both study groups could be placed into one of five classes of deformity based on its radiographic appearance at maturity. Each class showed a characteristic pattern of involvement during the active stages of the disease and had a specific long-term clinical and radiographic course. The clinical and radiographic course of an involved hip subsequent to childhood was related to the type of congruency that existed between the femoral head and acetabulum. Three types of congruency were recognized: (1) spherical congruency (Class-I and II hips) - in hips in this category arthritis does not develop; (2) aspherical congruency (Class-III and IV hips) - mild to moderate arthritis develops in late adulthood in these hips; and (3) aspherical incongruency (Class-V hips) - severe arthritis develops before the age of fifty years in these hips.

Adolescent↗
PubMed1980

Post-reduction avascular necrosis in congenital dislocation of the hip.

Twenty-five patients with thirty congenitally dislocated hips in which avascular necrosis developed after closed reduction were followed for an average of thirty-nine years from the time of reduction. Twenty-four of the thirty hips had moderate or severe osteoarthritis and twenty-two of the twenty-five patients had significant pain or loss of function, or both, by the time they were forty-two years old, The deformities produced by avascular necrosis that were related to osteoarthritis included: (1) loss of sphericity of the femoral head, (2) persistent lateral and proximal subluxation, (3) irregularity of the medial part of the femoral head, and (4) acetabular dysplasia. The study suggests that if avascular necrosis develops following closed reduction of a congenitally dislocated hip, attempts should be made to prevent lateral and proximal subluxation of the femoral head and to correct thse abnormalities, if possible, once they occur.

Adolescent↗
PubMed1979

Computational stress analysis of cup replacement hip arthroplasty.

A two-dimensional finite element model of a total surface replacement hip arthroplasty was utilized to study the performance characteristics of the prosthesis by means of stress analysis. No significant changes occur in stress field distribution following resurfacing arthroplasty in the proximal femur. Local bending phenomena appear to occur in the femoral component under static loading. Prosthesis-cortical bone continuity at the femoral neck does not affect stress field distribution. Finally, trochanteric osteotomy causes a change in the stress field distribution of the proximal femur that may be a significant factor in femoral neck fracture.

Bone Cements↗
PubMedDate not supplied

Breaststroker's knee: pathology, etiology, and treatment.

Twenty-three breaststroke swimmers (ranging in age from 6 to 30 years old) with painful knees were examined. Underwater movies of these swimmers were taken. Eighteen swimmers had tenderness under the medial facet of the patella and over the medial femoral intercondylar ridge. Five of these 18 swimmers also had tenderness along the tibial collateral ligament. Five swimmers had tenderness just along the tibial collateral ligament. The onset of knee pain usually occurred within 3 years of the swimmers' beginning the breaststroke. Initially, the knees were only symptomatic when the swimmers performed the whipkick. As the swimmer continued the breaststroke, in spite of discomfort, the knees became symptomatic during other athletic and nonathletic activity. Breaststroke who had been using the whipkick for more than 8 years had clinical evidence of patellofemoral osteoarthritis. The site of pain in the knee was related to the way in which the whipkick was performed. Breaststroke without knee pain used a whipkick with characteristics that were consistently different than those of the symptomatic swimmers. Treatment of breaststroke's knee should be directed toward correcting the swimmer's whipkick. This approach is most likely to be successful if applied as soon as the swimmer becomes symptomatic.

Adolescent↗
PubMedDate not supplied

CKS knee prosthesis: biomechanics and clinical results in 42 cases.

From 1991 to 1993 a total of 42 CKS prostheses were implanted for the following reasons: osteoarthrosis (34 cases), rheumatoid arthritis (7 cases) tibial necrosis (1 case). At follow-up obtained after 17 to 41 months the results were: excellent or good: 41; the only poor result was probably related to excessive tension of the posterior cruciate ligament. 94% of the patients reported complete regression of pain, 85% was capable of going up and down stairs without support. Mean joint flexion was 105 degrees. Radiologically the anatomical axis of the knee had a mean valgus of anatomical axis of the knee had a mean valgus of 6 degrees. The prosthetic components were always cemented. The posterior cruciate ligament was removed in 7 knees, so that the prosthesis with "posterior stability" was used. The patella was never prosthetized. One patient complained of peri-patellar pain two months after surgery which then regressed completely.

Aged↗