抄録
Two hundred and eleven low-friction arthroplasties in 167 patients followed for 5 years or more after surgery were studied radiologically. The first 92 simple hemispherical sockets were fixed with the old cement fixation technique in which only a few large anchor holes were bored before fixation. A hundred and nineteen sockets were fixed with the new technique in which multiple small anchor holes were bored. This modification of the fixation technique significantly improved the postoperative radiological findings, namely socket demarcation grading and socket wear.
From the results of a statistical comparison of various items between a group of 190 stems without subsidence and a group of 21 stems with subsidence, the stem-filling ratio in the medullary canal and the packing of cement distal to the prosthetic tip were considered to be the operative factors correlated with stem subsidence. Calcar resorption and atrophy of the femoral cortex were considered to be the biological factors.
