Psychometric properties of the 4-meter walk test after total knee arthroplasty.
Andrew Kittelson, Joel Carmichael, Jennifer Stevens-Lapsley and 1 others
PMID 33280460WHAT IT FOUND
The 4-meter walk test at fastest speed is as reliable and responsive as the 6-minute walk test in the first three months after knee replacement.
It takes less than four minutes and needs only eight meters of space, making it a practical choice for tracking early recovery.
Key findings
01The 4-meter walk test at fastest speed showed almost perfect test-retest reliability across all time points.
02The 4-meter walk test at fastest speed had better responsiveness than the 6-minute walk test from 2 to 3 months postoperatively.
03The 4-meter walk test at fastest speed correlated highly with the 6-minute walk test, explaining a substantial portion of its variance.
STILL TO COME
How it was doneWhat they foundWhat it means for PTs
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What it does not show
Multiple raters were used over the course of the study, and raters were not blinded to performance on the walk tests within a session, which could introduce error. The sample was drawn from a clinical trial, likely resulting in a more homogeneous population than typical clinical practice. Participants may have become familiarized to the 4-meter walk test over repeated administrations. The study was a secondary analysis of an RCT, not an independent validation study.
Declared interests
The authors reported no conflicts of interest. The study was supported by the National Institutes of Health and non-U.S. government sources.
The easy way to misread this
Do not use the 4-meter walk test at fastest speed as the sole measure of long-term recovery after three months post-surgery. The study found that the 6-minute walk test remained responsive to changes from 3 months to 1 year, whereas the 4-meter walk test showed only trivial responsiveness after 3 months.