Abstract
PURPOSE
The aim of this study was to study the short-term outcome of a contemporary modular revision knee system used in our centre for managing Knee revision arthroplasty
METHODS
Preoperative, one and two years follow up scores and radiographic analysis were recorded from 72 consecutive knee revision cases performed between 2006 and 2008. Outcome measures included the American Knee Society (AKSS), Oxford (OKS) and WOMAC scores and range of motion. The radiographic assessment included review of standing AP, lateral and skyline views. Figgie's method was used to measure the joint line reproduction. A difference of 5 mm (pre=op/post-op) was deemed satisfactory.
RESULTS
72 patients were included in this study, 38 male: 34 females with a mean age of 71.2 (50 -87 yrs.). Mean BMI-26.03, (Range 11-50). Indications for surgery in these patients- were aseptic loosening (38), instability (15), persistent pain and stiffness (7), polyarthropathy (1), ligament laxity (7) and infection (4).
The mean American Knee scores, and WOMAC scores at, 1 year and 2 years follow up showed significant improvements in pain and function (Table 1). The mean oxford knee score improved from 14/48 pre-operatively to 34/48 at 2yrs. (P value <0.0001). Radiographic assessment showed a mean AP coronal femoral angle of 95.3 degrees (range 89.6-99.9 degrees), coronal tibial angle of 90.1 degrees (Range 85.1-98.8 degrees). The mean sagittal femoral and tibial angles were 88.4 and 90.4 degrees respectively. The joint line level was reproduced in all cases.
DISCUSSION
The short-term results with the Legion Knee revision system showed significant improvement in functional and pain scores in these patients irrespective of their indications for revision surgery.
The used system also showed good outcome scores that match or beat published series on revisions. It also showed a good ability to restore joint line.
