Improved knee flexion following high-flexion total knee arthroplasty

David R. Lionberger, Mitchell D. Eggers, Kathryn E. Brewer, Li Fang

Research output: Contribution to journalArticlepeer-review

11 Scopus citations


Background: The application of new techniques and materials in total knee arthroplasty (TKA) continue to be a primary focus in orthopedic surgery. The primary aim of the present study is to evaluate post TKA total range of motion (ROM) among a group of patients who received a gender specific high-flexion design modification implant compared to a control group of patients who received non-gender specific implants.Methods and results: The control group was comprised of 39 TKAs that were recruited pre-operatively and received the non-gender specific implant while the study group consisted of 39 TKAs who received gender specific implants. The study group yielded an improvement in mean post-operative ROM of 21° at 12 months, whereas the mean improvement in ROM among the control group was 11°. Thus, the study group had a 10° increased ROM improvement (91%) over the control group (p = 0.00060). In addition, 100% of the subjects with gender specific high-flexion implants achieved greater or equal ROM post-operatively compared to 82% for the control cohort. Lastly, women who exhibited greater pre-operative ROM and lower body mass index (BMI) were found to benefit the most with the gender specific prosthesis.Conclusion: Our study demonstrates that among subjects with a normal BMI, the gender specific high-flexion knee implant is associated with increased ROM as compared to the non-gender specific non-high-flexion implant designs.

Original languageEnglish (US)
Article number22
JournalJournal of Orthopaedic Surgery and Research
Issue number1
StatePublished - Jun 6 2012


  • Body mass index
  • Gender-specific high-flexion knee prosthesis
  • Osteoarthritis
  • Range of motion
  • Total knee arthroplasty

ASJC Scopus subject areas

  • Surgery
  • Orthopedics and Sports Medicine


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