A prospective radiological follow-up study was performed on 40 total hip arthroplasties for bilateral osteonecrosis: in all cases, 20 HA-coated CLA(cementless Spotorno, Protek, Berne, Switzerland) femoral stems in Lt. sides adn 20
non-coated
CLS
titanium-ally femoral stems in Rt. side. The average follow-up was 13 months (mim, 6 months, max, 20 months).the operation was performed by single singel senior surgeon(J-M Lee) using direct lateral transgluteal approach. In a same
patient,
same
sized stems were used. The first operation was done in more painful hip joint, and the secone operation was followed 1-2 weeks later in the other side. At postopertive 6 weeks, half partial weight bearing was allowed. radiological
analysis
of
last follow-up films demonstrated greater radioluceent line in HA-coated group; 6 cases, which was mainly seen around the uncoated distal part of the stem(p<0.01). The endosteal spot welds was greater in non-coated group; 10 cases,
which
was
mainly seen around distal part of the stem(p<0.01).
Other radiological parameters such as stem subsidence, osteolysis, calcar response and heteotrophic ossification was not stastically significantly different between two kinds of stem. But long-term follow-up was demanding although the
early
radiological findings showed differences between two kinds of stem.
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