Survival of Prosthetic Replacement in Primary Bone Tumor around Knee Joint

Jeon, Dae Geun; Lee, Jong Seok; Kim, Sug Jun; Kwag, Bong Jun; Cho, Wan Hyeong; Lee, Soo Yong

Abstract

Thirty-one distal femoral and nine proximal tibial primary bone tumor patients who had prosthetic replacements were reviewed retrospectively. Average follow-up was thirty-eight months(range: 12- 109 months). There were thirty-two(osteosarcoma: 29, chondrosarcoma: 3) stage IIB lesions and eight 1B lesions(giant cell tumor). Twenty-nine patients were surviving at final follow-up. Overall prosthetic survival was 81%, 27% at 2 and 5 year respectively. Eleven prostheses were revised. The causes of revisions were infection(7), metal failure(2), fracture of host bone(1), and loosening(1). Eight revisions were successful, one was fair, and two patients needed an amputation. Prognostic factors which were analyzed for survival of prostheses were age, sex, location of primary lesion, percent of bone resected, and stage. Only the location of primary lesion showed statistical significance and diabolic pattern of survival curve was noted between two groups in resection length(<40% versus >40%). Average functional score was 26. The tibial side had worse prosthetic survival and a major threat to this procedure was due to infection.