The Twin Peg Oxford partial knee replacement: the first 100 cases.

We present the clinical results of the first 100 patients who received the Twin Peg Oxford partial knee replacement which has a 15° extra femoral surface for contact in deep flexion, and has two pegs for more secure fixation. We measured the clinical outcome 2 years after the medial unicompartmental arthroplasty using patient and surgeon derived outcome measures. The results showed a mean Oxford Knee Score of 41, a mean American Knee Society Objective Score of 93 and a Functional Score of 84, a mean range of motion of 130° and a high satisfaction rate. Results were significantly better in male patients. There were no deaths, infections, dislocations, fractures or revisions. There were no pathological radiolucencies suggestive of early loosening. We conclude that the Twin Peg Oxford partial knee replacement shows excellent clinical and radiological results at 2 years. For surgeons who have concern over the risk of femoral loosening with the single peg Oxford knee, or seek an improved surface area of contact in full flexion, this implant offers an excellent alternative.