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Related Experiment Videos

Total knee replacement; minimal clinically important differences and responders.

A Escobar1, L García Pérez, C Herrera-Espiñeira

  • 1Research Unit, Hospital Universitario Basurto, Avda. Montevideo 18, 48013 Bilbao, Spain.

Osteoarthritis and Cartilage
|October 8, 2013
PubMed
Summary
This summary is machine-generated.

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Minimally clinically important difference (MCID) for pain and function after total knee replacement (TKR) varies by baseline severity. MCID estimates should be tailored to individual patient baseline scores for accurate assessment of outcomes.

Area of Science:

  • Orthopedics
  • Rheumatology
  • Clinical Outcomes Research

Background:

  • Total knee replacement (TKR) is a common procedure for end-stage knee osteoarthritis.
  • Assessing patient-reported outcomes, particularly pain and function, is crucial after TKR.
  • The Western Ontario and McMaster Osteoarthritis Index (WOMAC) is a widely used tool for evaluating TKR outcomes.

Purpose of the Study:

  • To determine the minimally clinically important difference (MCID) for pain and function using the WOMAC in TKR patients.
  • To calculate the percentage of responders based on established MCID thresholds.
  • To investigate the influence of baseline disease severity on MCID values.

Main Methods:

  • A prospective, 1-year, multicenter study involving two patient cohorts (n=415 and n=497) awaiting TKR.
Keywords:
MCIDRespondersTotal knee replacement

Related Experiment Videos

  • WOMAC pain and function scores (0-100, worst to best) were collected.
  • MCID was calculated using mean change in 'somewhat better' patients, Receiver Operating Characteristic (ROC) analysis, and satisfaction questions, with analysis stratified by baseline severity tertiles.

    • Main Results:

    • Global MCID estimates for pain were approximately 30 and 32 across cohorts, while ROC analysis yielded values around 20-24.
    • Transitional item-based MCID estimates were 27 for pain and 20 for function.
    • Higher baseline WOMAC scores correlated with higher MCID cut-off values.
    • Responder rates (61% for pain, 50% for function) remained consistent when comparing global MCID to tertile-specific MCID.

    Conclusions:

    • MCID values for pain and function after TKR exhibit significant variability.
    • Baseline disease severity is a critical factor influencing MCID estimates.
    • MCID calculations and interpretations should account for the patient's baseline symptom severity for more accurate outcome assessment.