Abstract
Purpose
In clinical practice, people with better femorotibial rotation in the flexed position often achieve a favourable postoperative maximum flexion angle (MFA). However, no objective data have been reported to support this clinical observation. In the present study, we aimed to investigate the correlation between the amount of intraoperative rotation and the pre- and postoperative flexion angles.
Methods
Fifty-five patients with varus osteoarthritis undergoing computer-assisted posterior-stabilized total knee arthroplasty (TKA) were enrolled. After registration, rotational stress was applied towards the knee joint, and the rotational angles were recorded by using a navigation system at maximum extension and 90° of flexion. After implantation, rotational stress was applied for a second time, and the angles were recorded once more. The MFA was measured before surgery and 1 month after surgery, and the correlation between the amount of femorotibial rotation during surgery and the MFA was statistically evaluated.
Results
Although the amount of tibial rotation at maximum extension was not correlated with the MFA, the amount of tibial rotation at 90° of flexion after registration was positively correlated with the pre- and postoperative MFA (both p < 0.005). However, no significant relationship was observed between the amount of tibial rotation after implantation and the postoperative MFA (n.s.).
Conclusion
The results showed that better femorotibial rotation at 90° of flexion is associated with a favourable postoperative MFA, suggesting that the flexibility of the surrounding soft tissues is an important factor for obtaining a better MFA, which has important clinical relevance. Hence, further evaluation of navigation-based kinematics during TKA may provide useful information on MFA.
Level of evidence
Diagnostic studies, development of diagnostic criteria in a consecutive series of patients, and a universally applied “gold” standard, Level II.
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Ishida, K., Shibanuma, N., Matsumoto, T. et al. Navigation-based tibial rotation at 90° of flexion is associated with better range of motion in navigated total knee arthroplasty. Knee Surg Sports Traumatol Arthrosc 24, 2447–2452 (2016). https://doi.org/10.1007/s00167-016-4008-2
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DOI: https://doi.org/10.1007/s00167-016-4008-2