Femoral neck cut level affects positioning of modular short-stem implant

Mihalko, W.M., Saleh, K.J., Heller, M.O., Mollard, B., König, C. and Kammerzell, S. (2009) Femoral neck cut level affects positioning of modular short-stem implant. Orthopedics, 32, supplement 10, 18-21. (doi:10.3928/01477447-20090915-53). (PMID:19835302)

Abstract

A trend in total hip arthroplasty surgery has been to design more bone-preserving procedures, especially for younger patients. This study investigated the final implant positioning of a short metaphyseal femoral neck type of implant to determine whether leg length, caput collum diaphysis (CCD) angle, and offset could be re-created with different levels of femoral neck resection. Ten cadaveric hips in 6 whole-body specimens were used, with 3 fiducial markers to allow registration of computer navigation points to computed tomography scan data. Three femoral neck resection levels were investigated: 0 mm, +5 mm (the recommended level of resection), and +10 mm from the base of the femoral neck. Results showed that the CCD angle was significantly higher with 0-mm neck cut and the offset was lower, whereas the highest neck cut had longer leg-length results. Surgeons who use a short metaphyseal stem need to realize the importance of a proper femoral neck cut to restore anatomic parameters as well as the possible benefit of computer-assisted surgery to restore these anatomic parameters during surgery.

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Contributors

Author: M.O. Heller

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