Abstract
Revision Total Hip Arthroplasty can be challenging in case of thin or fragile femur. Primary Bipolar Hip Prosthesis (BHP) is also difficult in severe osteoporosis case. We have used titanium alloy cementless stem with interlocking screws for revision THA since 2003, and primary BHP in senile case since 2007.
Thirty four cementless THA were performed with interlocking stem (27 S-LOCK and 7 Delta-LOCK) since 2007, and 26 cases were followed for more than one year. Two for primary THA and 24 for revision THA, 3 were male and 23 were female. Seven primary Bipolar Hip Prosthesis with interlocking screw stem for femoral neck fracture were also followed more than one year. All seven BHP cases were female.
Stress shielding in X-ray film were observed in 3 revision THA cases during follow up, but no pain were complained. No breakage of screws and stems were observed, and no infections and no fractures were occurred.
In case of loosened stem, long interlocking stem can bypass the weak point of femur after removal of cement or metal stem tip. Patients can walk immediately after revision THA or primary BHP.
Cementless interlocking stem in THA and BHP is useful for management of thin or fragile femoral cortex.
