ISOLATED REVISION ACETABULOPLASTY USING A POROUS-COATED CEMENTLESS ACETABULAR COMPONENT WITHOUT REMOVAL OF A WELL-FIXED FEMORAL COMPONENT -A 3 TO 9-YEAR FOLLOW-UP-STUDY

The results of isolated acetabular revision performed in 31 patients ( 32 hips) were monitored for between 3 and 9 years. All femoral compone nts were well fixed and not removed or revised at the time of index su rgery. There were 4 hips with little or no acetabular bony defect, 2 h ips with pure segmental defects (type I), 10 hips with cavitary defect s (type Il), 15 with combined segmental cavitary defects (type III), a nd 1 with pelvic discontinuity (type IV). All revision acetabular impl ants were cementless, using a porous-coated hemispheric cup with or wi thout bone-graft. There were four grade I reconstructions, 16 grade II reconstructions, and 12 grade III reconstructions. At final follow-up evaluation 94% of the cups were judged to be stable. Two hips require d a second revision acetabuloplasty because of loss of fixation of the cup. The 2 repeat revisions were also done without removal of the fem oral component. One acetabular component had evidence of rotational mi gration, which stabilized and remained nonprogressive. There were no c ases of femoral component radiographic or clinical failure. The mean p re and postoperative hip scores were 44 and 83, respectively. The pre- and postoperative pain scores were 12 and 42, respectively. The findi ngs of this study suggest that isolated acetabular revision, using a c ementless porous-coated hemispheric cup, can be successfully performed without removing or revising a well-fixed femoral stem and not compro mise the final outcome.