Severe deformity and bone loss in patients with degenerative changes of the knee present a challenging surgical dilemma to the knee surgeon. We present the outcome following complex primary total knee replacements at our unit over 12 years undertaken by a single surgeon. 65 patients were followed up prospectively with regards to their pre- and post-operative Oxford knee scores, diagnoses, preoperative deformity, bone loss, surgical technique, type of implant used, bone substitutes, and perioperative, or long term complications. These patients were followed up annually. 70 complex primary total knee replacements were performed in 65 patients. The mean age was 70.5 years and the mean follow up was 62.4 months. Sleeve/wedge augmentation, and stemmed implant (Sigma®TC3- DePuy) were used in general. Bone grafting was utilized for contained bone defects. All except 4 patients were allowed to fully weight bear immediately postoperatively. The mean range of flexion was 112.5 degrees at their last follow up. The mean preoperative Oxford Knee Score was 12.8, and 41.5 postoperatively. 89.4% of patients had either an excellent or good, and the rest a fair outcome. Radiological appearance has been satisfactory in all patients at subsequent follow up, with no evidence of implant loosening. None required revision surgery. 6 patients required blood transfusion postoperatively. 2 patents developed symptomatic deep vein thrombosis and a further 2 had pulmonary embolusMethod:
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