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The Journal of Bone & Joint Surgery British Volume
Vol. 74-B, Issue 5 | Pages 721 - 724
1 Sep 1992
Franzen H Mjoberg B Onnerfalt R

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.


The Journal of Bone & Joint Surgery British Volume
Vol. 74-B, Issue 3 | Pages 470 - 471
1 May 1992
Sjostrom L Mjoberg B


The Journal of Bone & Joint Surgery British Volume
Vol. 73-B, Issue 3 | Pages 374 - 376
1 May 1991
Berg P Mjoberg B

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.


The Journal of Bone & Joint Surgery British Volume
Vol. 71-B, Issue 3 | Pages 538 - 538
1 May 1989
Mjoberg B


The Journal of Bone & Joint Surgery British Volume
Vol. 68-B, Issue 5 | Pages 770 - 774
1 Nov 1986
Mjoberg B Selvik G Hansson L Rosenqvist R Onnerfalt R

Twenty patients were examined by standard radiography and roentgen stereophotogrammetric analysis (RSA) during a two-year period after total hip arthroplasty. Eleven of the acetabular components migrated cranially and three femoral components migrated distally. This migration was most rapid during the first four months after operation. Our findings support the possibility that mechanical loosening is initiated by thermal injury during polymerisation of the cement; the less frequent migration of the metallic femoral component compared with the polyethylene acetabular component may be because the metal acts as a heat sink. Standard radiographs were inadequate for assessment of early mechanical loosening, whereas RSA could reveal migration within four months of the arthroplasty.