Abstract
Background: A total new double-threaded cone-shaped modular femoral stem has been designed, using rotational rather than percussive hammer insertion of the prosthesis. The vertical height, the neck length, the neck anteversion angle and the medial offset can all be adjusted after preparation of the femoral canal has been completed.
Methods: A consecutive series of the first 110 hip joints in 103 patients were followed clinically and radiographically for an average of 28 months.
Results: The mean Harris hip score rose from 43.6 points preoperatively to 91 points postoperatively. The mean pain score changed from 7.9 points to 42 points, respectively.
13 hips (11.8%) had mid-thigh pain, most of them mild. One hip (0.9%) showed clinical and radiographic signs of early loosening and was revised.
Conclusion: The short-term clinical and radiographic outcomes are encouraging. The double-threaded cone-shaped stem locking mechanism has been shown to be able to withstand the torsional and vertical forces applied to hip replacement prosthesis.
The abstracts were prepared by Orah Naor. Correspondence should be addressed to him at the Israel Orthopaedic Association, PO Box 7845, Haifa 31074, Israel.
