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Published on: September 30, 2020
The minimal clinically important difference changes greatly based on the patient's baseline clinical status
Marco Franceschini1, Angelo Boffa1, Alessandro Di Martino2
1Università di Bologna Bologna Italy.
Patient baseline status significantly impacts minimal clinically important difference (MCID) calculations for knee osteoarthritis. Worse baseline scores require greater improvement for perceived relevance, highlighting the need for stratified analysis in treatment evaluation.
Area of Science:
- Orthopedics
- Regenerative Medicine
- Clinical Outcomes Research
Background:
- Platelet-rich plasma (PRP) injections are used for knee osteoarthritis.
- Patient-reported outcome measures (PROMs) assess treatment effectiveness.
- Minimal Clinically Important Difference (MCID) quantifies meaningful improvement.
Purpose of the Study:
- To determine how baseline patient-reported outcome measure (PROM) values influence MCID calculations.
- To investigate the impact of baseline International Knee Documentation Committee (IKDC) scores on MCID in knee osteoarthritis patients treated with PRP.
Main Methods:
- Analyzed data from 312 knee osteoarthritis patients receiving intra-articular PRP injections.
- Stratified patients into 8 and then 3 clusters based on baseline IKDC scores.
- Calculated MCID for the IKDC score using an anchor-based method.
Main Results:
- MCID values varied significantly across baseline IKDC score clusters, ranging from 16.2 to -3.1.
- MCID was 14.6 for baseline IKDC <40, 7.2 for 40-69, and -2.8 for ≥70.
- Higher MCID values were observed in patients with worse baseline clinical status.
Conclusions:
- Baseline clinical status is a critical factor influencing the MCID in knee osteoarthritis.
- General MCID thresholds may not be universally applicable; patient stratification is essential.
- Stratified MCID analysis improves the identification of patients who benefit from PRP treatment.
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