Successful clinical outcomes following unicompartmental knee arthroplasty (UKA) are dependent on accurate component positioning,56 soft tissue balance and overall limb alignment.54
Forgotten Joint Score one and two years following surgery. Note that the medial UKA group showed significantly higher scores at one- and two-year follow-up (FJS one year 73.9 +/- 22.8, FJS two year 74.3 +/-24.8) in contrast to the TKA group (FJS one year 59.3 +/- 29.5, p=0.002, FJS two year 59.8 +/- 31.5, p=0.004).
Pre-operative Merchant view of a left knee. The trochlear angle (red angle) is 140°. The congruence angle (yellow angle) is 14°. The medial patella–femoral joint space is represented by the purple line.66
Post-operative Merchant view of a left knee. The trochlear angle (red angle) is 140°. The post-operative congruence angle (yellow angle: 6°) is decreased compared to the preoperative one (Fig 3). Moreover, the medial patella–femoral joint space (purple line) is increased by 1.5mm following unicondylar knee arthroplasty.66