Range of Motion Comparison Following Total Knee Arthroplasty with and without Patella Resurfacing


  • Melissa Jackels
  • Samantha Andrews Straub Medical Center
  • Maya Matsumoto
  • Kristin Mathews
  • Cass Nakasone




range of motion, Total Knee Arthroplasty, patella resurfacing


Background: Despite significant evaluation, no consensus has been reach for best clinical practice for resurfacing the patella during total knee arthroplasty. Further complicating the ability to reach a conclusion is the inclusion of several different implant types used in previous research.

Questions/Purpose: The purpose of this study was to compare post-TKA outcomes between two cruciate retaining implants with or without patella resurfacing.

Methods: This retrospective review included 289 patients (380 knees) with a minimum six-month follow-up. All patients received a CR implant, with either a symmetric or an asymmetric tibial baseplate. Post-TKA knee flexion was categorized as <120° and ?120° and knee extension classified as 0° or >0° and required knee manipulations were noted. Descriptive, nonparametric statistics were performed and a multivariate logistic regression was performed to determine risk of poor range of motion and manipulations.

Results: Age was significantly lower in the resurfaced group (p=0.001) and the resurfaced group had longer tourniquet time (p=0.003). The symmetric-resurfaced group had ?120° of flexion and full extension in 72% and 98.7% of patients, respectively. Compared to symmetric-resurfaced, all other groups had a significantly greater risk of not reaching 120° of knee flexion (p<0.05). There were no significant differences in the risk of requiring a MUA between groups (p>0.06).

Conclusions: The effect of resurfacing the patella on post-TKA outcomes may be influenced by tibial implant design. Compared to all other combinations, a symmetric tibial baseplate and resurfaced patella resulted in the highest percentage of patients reaching ?120°, with a low incidence of manipulations.


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How to Cite

Jackels, M., Andrews, S., Matsumoto, M., Mathews, K., & Nakasone, C. (2021). Range of Motion Comparison Following Total Knee Arthroplasty with and without Patella Resurfacing. Reconstructive Review, 11(1). https://doi.org/10.15438/rr.11.1.286



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