High flexion TKA design achieved additional intraoperative flexion

Lutzner J. J Arthroplasty. 2014. doi:10.1016/j.arth.2013.09.046.

Use of a cruciate-retaining high-flexion design for total knee arthroplasty achieved a small amount of additional intraoperative flexion compared with a cruciate-retaining standard implant; however, the difference was not sustained at follow-up, according to study results.

Researchers randomly assigned 122 patients to receive a cruciate-retaining standard or high-flexion total knee arthroplasty (TKA). The study’s primary outcome measure was range of motion (ROM), and additional outcomes included Knee Society Score and health-related quality-of-life scores (SF-36).

According to study results, patients experienced a greater intraoperative ROM with the high-flexion implants, with a mean flexion of 109.9° preoperatively, 129.1° intraoperatively and at 109.7° 1 year follow-up compared with a mean flexion 107.4° preoperatively, 123° intraoperatively and 108.9° at 1 year follow-up in the standard group. Although the difference was considered statistically significant intraoperatively (P < .001), it was not considered significant preoperatively or at follow-up.

Multivariate analysis showed preoperative knee flexion as the only significant factor influencing knee flexion at follow-up, according to the researchers. There were no differences found in the Knee Society Score or SF-36.

Disclosure: See the study for a full list of all authors’ relevant financial disclosures.



Josh Sandberg

Josh Sandberg is the President of Ortho Sales Partners and Partner for The De Angelis Group. He also serves as Co-Founder and Editor of OrthoSpineNews.

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