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Biomedical subjects

B Mjöberg

Publications and source records attributed to B Mjöberg.

At least 37 records · Page 2Linked to original sources
PubMed1992

Early loosening of femoral components after cemented revision. A roentgen stereophotogrammetric study.

Roentgen stereophotogrammetric analysis was used to measure the migration of 24 cemented femoral components implanted during revision for mechanical loosening. All hips were examined one week, four months and one year after surgery; 14 hips were also examined after two years. Twenty-one components subsided 0.2 to 5.5 mm during the observation period; in 17 of these, subsidence occurred within four months of surgery. In 16 hips the prosthetic head was displaced 0.7 to 11.2 mm posteriorly. The fixation of the femoral components was less secure than after primary arthroplasty, especially in cases of femoral canal enlargement, when a standard-sized rather than a thick-stemmed prosthesis had been used, and in cases of inadequate cement filling.

Aged↗
PubMed1992

Accuracy of the Nunn method in measuring acetabular cup migration.

The accuracy of the Nunn method in measuring acetabular component migration was compared with 3 other radiological methods and with roentgen stereophotogrammetry in 34 pelvic radiographs. The Nunn method seems to have the same or better accuracy than the other non-computerized methods, but less accuracy than the computerized EBRA method.

Acetabulum↗
PubMed1992

The triradiate incision for acetabular fractures. A prospective study of 23 cases.

24 acetabular fractures, displaced in the dome, were operated on through the triradiate incision, and 23 were followed for at least 2 years. All but one fracture were anatomically reduced in the dome. At follow-up, 7 hips had developed arthrosis, all with comminuted fractures with separate osteochondral dome fragments. Heterotopic bone formation occurred in 13 hips: 10/14 with indomethacin prophylaxis had no heterotopic bone, whereas all 9 without indomethacin prophylaxis had. We conclude that the triradiate incision is suitable for surgical treatment of complex acetabular fractures, and that the heterotopic bone formation can be reduced by indomethacin prophylaxis.

Acetabulum↗
PubMed1991

A lateral skin incision reduces peripatellar dysaesthesia after knee surgery.

In a series of 64 ligamentous injuries of the knee, 33 were explored through a medial incision and 31 through a long lateral incision. Sensibility of the skin, the occurrence of neuromas, and discomfort during kneeling were evaluated three and six years postoperatively. The lateral incisions produced less dysaesthesia, fewer neuromas and less discomfort on kneeling.

Dermatologic Surgical Procedures↗
PubMed1991

Fixation and loosening of hip prostheses. A review.

Studies using roentgen stereophotogrammetry and bone scintigraphy support a narrow definition of prosthetic fixation (viz., nonmigration), and consequently a broad definition of loosening. Roentgen stereophotogrammetric research indicates that if loosening occurs, it is initiated at an early stage; insufficient initial fixation or loss of fixation by resorption of a layer of heat-injured bone may cause prosthetic instability and progressive bone resorption. Migration of one or both prosthetic components can be revealed by roentgen stereophotogrammetry in many asymptomatic hips during the first postoperative year--some of these components will probably fail in the future. The femoral component is exposed to greater shear stresses than the acetabular component, and it is uncertain whether fixation of the femoral component can be achieved more than occasionally without the use of bone cement.

Bone Cements↗
PubMed1990

Early detection of prosthetic-hip loosening. Comparison of low- and high-viscosity bone cement.

In 1987, we reported the 1-year migration of the prosthetic components in 16 hips followed by roentgen stereophotogrammetry after fixation with either low- or high-viscosity cement. We now report the migration of these prosthetic components during another 2 postoperative years. Eight acetabular components, four in each group, migrated cranially; and four femoral components, three in the low-viscosity and one in the high-viscosity group, migrated distally. All but two migrations were obvious 4 months postoperatively, which indicates that what is called late loosening is the result of late detection rather than of late occurrence of loosening. Low-viscosity cement did not provide improved prosthetic fixation.

Bone Cements↗
PubMed1990

Wear and loosening of the hip prosthesis. A roentgen stereophotogrammetric 3-year study of 14 cases.

Fourteen patients were followed by roentgen stereophotogrammetry for 3 years after hip arthroplasty. In 11 of the 14 acetabular components, definite wear was identified. The mean wear rate was 0.13 mm per year. There was no correlation between the wear and loosening of either the acetabular or the femoral component. Our findings indicate that products of wear do not initiate prosthetic loosening.

Follow-Up Studies↗