Comparison of Radiological Results of Total Knee Arthroplasty: Navigation System-assisted Versus Conventional Technique

Keimyung Medical Journal 2013;32(2):154-160.

네비게이션 장치를 이용한 슬관절 전치환술과 고식적 슬관절 전치환술의 방사선학적 결과 비교

이길호; 배기철

Abstract

We compare the radiological results between Image-free navigation system-assisted total knee arthroplasty (TKA) using the OrthoPilot and conventional TKA. Between April 2008 and June 2009; we performed 100 primary TKA. Of these patients; 50 cases were operated with a Imagefree navigation (OrthoPilotR4.0; Aesculap; Germany) (Group A) and 50 cases were operated with conventional manual alignment system (Group B). The alignment of the lower limb and the position of the components were compared between two groups on postoperative standing anteroposterior and supine lateral radiographs. The mean postoperative femorotibial alignment (α) was 0.73 of conventional TKA group (B) 0.99 of valgus in the navigation group (A); however; more cases of the navigation group was located at the acceptable zone (94% compared with 80%). The coronal inclination of femoral component to mechanical axis (θ) and patella congruence angle (k) were significantly more accurate in group A than group B Group (96% compared with 80%; 94% compared with 66%). There were no significant differences between two groups in the coronal inclination of tibial component (β); the sagittal inclination of femoral component to anatomical axis (γ) and the sagittal inclination of tibial component (δ). Radiological
results
of TKA using Image-free navigation system allowed more proper limb alignment than that of conventional TKA. This result may affect the long-term results of primary TKA; but longer term investigation is needed.

Key Words: Computer assisted navigation system, Total knee arthroplasty