Abstract
Objective To compare the mechanical axis and alignment of component between conventional total knee arthroplasty(TKA)and TKA under computer-assistde navigation.Methods From May 2007 to December 2009.60 patients with knee osteoarthritis were assigned randomly to receive conventional TKA and computer-assisted navigation TKA with the same type of implant for each knee.In navigation group (group A).there were 11 men and 19 women.with an average age of 69.2±8.3 years.The mean prcoperative alignment deviation was 9.4° ±5.3°.The knee osteoarthritis was rated as grade Ⅲ in 12 cases and grade Ⅳ in 18 cases.In conventional group (group B)、there were 17 men and 13 women,with an average age of 71.9 ± 8.1 years The mean preoperative alignment deviation was 8.9°± 4.8°.The knee osteoarthritis was rated as grade Ⅲ in 17 cases and grade Ⅳ in 13 cases.Alignment of the leg and orientation of components were evaluated on standard pre-and post-operative full-length weight-bearing radiographs and lateral X-rays with reard to the valgus angle and the coronal and sagittal component angles. Results The mean deviation in hip-knee-ankle angle in group A (0.7°±0.2°) was signifieantly smaller than that in group B (1.2°± 0.3°) ( t =3.972.P =0.000).The mean postoperativc deviation in frontal femoral component anglein group A (1.5°±0.4°)was significantly smaller than that in groupB (2.1° ±0.5°) (t=2.433、P =0.017).The mean deviation in frontal tibial component angle in group A (2.1°±0.5°) was insignificantly smaller than that in group B (1.5°±0.6°) (t=0.326.P=0.116).The mean deviations in lateral femoral component and lateral al tibial component angles in group A (7.3°±0.4° and 2.5°±0.2°) were signifi cantly smaller than those in group B (9.5°± 0.4° and 4.5 ± 0.6°) ( P ＜ 0.05 ).The operating time in group A was 15 to 28 minutes longer than in group B(t=2.553,P=0.008).Conclusion Computer-assisted navigation system used in TKA can result in a better correction of alignment of the leg and better orientation of the components than does conventional TKA. Key words: Surgery, computer-assisted; Arthroplasty, replaeement, knee; Prospective studies
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