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Minimal Clinically Important Difference (MCID) for the Short Musculoskeletal Function Assessment (SMFA) in Severe
Anthony R Carlini1, Julie Agel2, Michael J Bosse3
1Department of Health Policy and Management, Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland.
Summary
This study establishes minimal clinically important differences (MCIDs) for the Short Musculoskeletal Function Assessment (SMFA) in patients with lower extremity fractures. The findings provide crucial benchmarks for interpreting functional outcome changes in orthopaedic care.
Area of Science:
- Orthopaedic Surgery
- Patient-Reported Outcomes
- Clinical Trial Methodology
Background:
- The Short Musculoskeletal Function Assessment (SMFA) is a validated patient-reported outcome (PRO) measure used in orthopaedics.
- An agreed-upon minimal clinically important difference (MCID) for the SMFA is currently lacking.
- This study addresses the need for MCID values using a large cohort of patients with severe lower extremity fractures.
Purpose of the Study:
- To establish distributional minimal clinically important differences (MCIDs) for the SMFA.
- To determine MCIDs for the SMFA Dysfunction Index and Bother Index.
- To analyze MCID variability across different patient characteristics and injury groups.
Main Methods:
- Utilized three distributional approaches: half standard deviation (SD), twice standard error of measurement (2SEM), and minimal detectable change (MDC).
- Calculated MCIDs for SMFA Dysfunction and Bother Indices and all domains.
- Evaluated MCID calculations across patient demographics, assessment timing, and injury types.
Main Results:
- Analyzed 4,298 SMFA assessments from 3,185 patients across 7 multicenter studies.
- Overall sample MCIDs ranged from 7.7 to 10.7 for the Dysfunction Index and 11.0 to 16.8 for the Bother Index.
- Variability in Dysfunction Index scores was minimal by sex/age but modest by assessment timing.
Conclusions:
- Defensible MCIDs for the SMFA Dysfunction Index are between 7 and 11 points.
- Defensible MCIDs for the SMFA Bother Index are between 11 and 17 points.
- MCID values are consistent across subgroups, though the precise choice may depend on the statistical method and population.
