Prediction of post-operative range of motion using intra-operative soft tissue balance in total knee arthroplasty with navigation. (2nd January 2015)

• Record Type: Journal Article
• Authors: Hasegawa, Masahiro; Takagita, Hisatsugu; Sudo, Akihiro
• Is Part Of: Computer aided surgery. Volume 20:Number 1(2015:Jan.)
• Page Start: 47
• Page End: 51
• Publication Date: 2015-01-02
• Subjects: Navigation; -- range of motion; -- soft tissue balance; -- total knee arthroplasty; Computer-assisted surgery -- Periodicals; Imaging systems in medicine -- Periodicals; Surgery, Operative -- Computer simulation -- Periodicals; Surgical technology -- Periodicals; Medical technology -- Periodicals; 617.90285
• DOI: 10.3109/10929088.2015.1076045
• Languages: English
• ISSNs: 1092-9088

Abstract

Abstract: This study evaluated the influence of intra-operative soft tissue balance on post-operative range of motion in patients undergoing posterior-stabilized total knee arthroplasty with navigation. After implantation of all components in 31 consecutive patients, the joint component gap was measured manually with the knee at 0°, 90°, and 120° as guided by a navigation system. We designated soft tissue balance as the absolute difference between varus stress and valgus stress (medio-lateral laxity). Changes in medio-lateral laxity were calculated from 120° to 90°, 120° to 0°, and 90° to 0°. Correlations among post-operative flexion angles and pre-operative flexion angles, intra-operative flexion angle after implantation, soft tissue balance, and the changes were analyzed. The mean pre- and post-operative knee flexion angles were 114 ± 20° and 127 ± 9°, respectively. The mean intra-operative flexion angle was 137 ± 6°. The post-operative flexion angle was positively correlated with the pre-operative flexion angle and intra-operative flexion angle after implantation. The change in soft tissue balance between 120° and 90° showed a positive correlation with the post-operative flexion angle. In conclusion, Assessment of intra-operative soft tissue balance could predict post-operative flexion angle.