12-year results with the cementless Bicontact SD stem in dysplastic and narrow femoral bone conditions.

AIM: The aim of the study was the evaluation of the medium- to long-term results of the cementless Bicontact SD hip arthroplasty, which was designed specially for narrow femoral medullary cavities.

METHOD: From February 1992 to December 1996 115 patients (123 joints) were treated with a Bicontact SD stem and various cup implants through a posterior approach. In one third of cases, the indication was dysplastic osteoarthritis of various degrees of severity.

RESULTS

Between November 2006 and May 2007 90 patients (98 hip joints) were followed up in a retrospective study after an average of 12.2 (10.1-15.1) years. The average Harris Hip Score was 93 (60-100) points and the Merle d'Aubigné score was 16.7 (5-18) points. A stem implant had to be regarded as loosened according to radiological criteria. One patient died 7 days postoperatively of a pulmonary embolism.

CONCLUSION

The clinical and radiological results confirmed the proximal fixation concept in dysplastic femurs and narrow medullary cavities.