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Related Experiment Videos

Range of motion in total knee replacement

Y S Anouchi1, M McShane, F Kelly

  • 1Ortho Surgery, Ohio Permanente Med Group, Cleveland, USA.

Clinical Orthopaedics and Related Research
|October 1, 1996
PubMed
Summary

Preoperative knee range of motion and knee society score significantly predict postoperative outcomes in total knee replacement. Higher preoperative flexion and lower scores indicate greater improvement, highlighting the importance of baseline patient status.

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Area of Science:

  • Orthopedic Surgery
  • Biomedical Engineering
  • Clinical Outcomes Research

Background:

  • Total knee replacement (TKR) aims to restore function and alleviate pain.
  • Predicting postoperative range of motion (ROM) and functional outcomes is crucial for patient expectations and surgical planning.
  • Factors influencing TKR outcomes require further investigation to optimize patient results.

Purpose of the Study:

  • To evaluate the impact of preoperative variables on postoperative range of motion and knee scores after total knee replacement.
  • To identify the best predictors of clinical success in total knee replacement patients.

Main Methods:

  • A multicenter prospective clinical study involving 621 patients undergoing TKR with a single total knee system.
  • Data collected included age, gender, weight, preoperative ROM, preoperative knee score, previous surgery, and femoral condyle geometry.

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  • Multivariate analysis was used to assess the relationship between preoperative variables and primary outcome (change in flexion) and secondary outcomes (knee score, functional evaluation, pain).

    • Main Results:

    • Preoperative range of motion was a significant predictor of postoperative flexion; patients with less than 90 degrees of preoperative flexion achieved greater improvements.
    • Preoperative knee score was the strongest predictor of postoperative knee score and functional evaluation, with lower scores correlating to higher improvements.
    • Age, weight, previous surgery, and femoral component modification did not show significant correlation with changes in postoperative flexion.

    Conclusions:

    • Preoperative range of motion and knee society score are the most significant predictors of postoperative outcomes in total knee replacement.
    • Patients with poorer preoperative function (lower ROM, lower scores) tend to experience greater improvements after TKR.
    • These findings underscore the importance of baseline patient status in predicting and evaluating total knee replacement success.