Preoperative flexion does not influence postoperative flexion after rotating-platform total knee arthroplasty

Robert D. Russell, Michael H. Huo, Leslie de Jong, Richard E. Jones

Research output: Contribution to journalArticlepeer-review

8 Scopus citations


Purpose: Preoperative range of motion (ROM) has been regarded as one of the most important factors in predicting postoperative ROM following total knee arthroplasty (TKA). Mobile-bearing TKA designs have been suggested to possibly improve the knee kinematics compared to fixed-bearing designs. The purpose of this study was to examine the difference in postoperative flexion as a function of preoperative flexion in a consecutive series of TKAs done using a posterior-stabilized rotating-platform prosthesis. Methods: ROM was assessed in 153 consecutive TKAs done using a rotating-platform posterior cruciate-substituting design. Patients were divided into two groups based on their preoperative ROM (Group 1 < 95°, Group 2 > 95°). The Knee Society Score (KSS) and ROM were assessed preoperatively, 3 months and 12 months postoperatively. Results: There was no difference in flexion 12 months after surgery between groups (mean 120° and 123°, respectively. n.s.). After 3 month follow-up, no increase in ROM was experienced by either group. Patients in Group 1 experienced significantly greater increases in both ROM (p < 0.001) and KSS (p < 0.05). There was no difference in the KSS at 12 months after surgery between groups. Conclusion: In this series of patients undergoing TKA with a rotating-platform prosthesis, the preoperative ROM was not predictive of the postoperative ROM. Patients with stiff knees preoperatively may benefit from a mobile-bearing design prosthesis. Level of evidence: Case-control study, Level III.

Original languageEnglish (US)
Pages (from-to)1644-1648
Number of pages5
JournalKnee Surgery, Sports Traumatology, Arthroscopy
Issue number7
StatePublished - Jul 2014


  • ROM prediction after TKA
  • Range of motion (ROM)
  • Rotating platform
  • TKA

ASJC Scopus subject areas

  • Surgery
  • Orthopedics and Sports Medicine


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