The removal of porous-coated femoral hip stems.

Abstract

During a ten-year period, 70 porous-coated femoral hip components of several designs were removed for various reasons. Based on this experience, techniques for the removal of porous-coated stems have evolved and are described, including a newer method for the safe removal of extensively coated bone-ingrown stems. Preoperative roentgenograms were highly predictive of fixation mode as corroborated by intraoperative mechanical testing, gross inspection, and histologic examination. Stable implants (17 bone-ingrown and 11 fibrous tissue-encapsulated) required interface access and division before their removal. Minimal bone damage was incurred, and in no case was reconstruction precluded by stem removal. There were no unplanned cortical perforations. Two minor femoral fractures occurred. The authors present an overall approach and specific surgical techniques that facilitate the safe removal of porous-coated femoral stems on a consistent basis.