Effectiveness of a Physical Therapist-Administered Physical Activity Intervention After Total Knee Replacement: A Randomized Trial.
Daniel K White, Jason Jakiela, Sydney Liles and 7 others
PMID 41347910WHAT IT FOUND
Adding Fitbit step goals to standard physical therapy after knee replacement did not increase moderate-to-vigorous activity more than therapy alone.
Both groups improved similarly over six months. Step goals alone may not be enough to change high-intensity movement in this population.
Key findings
01There was no significant difference between groups in the change in moderate-to-vigorous physical activity over time.
02Moderate-to-vigorous physical activity increased by a median of 6.0 minutes per day in the intervention group and 5.9 minutes per day in the control group.
03There was no significant difference between groups in the change in total steps per day over time.
STILL TO COME
How it was doneWhat they foundWhat it means for PTs
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What it does not show
Participants and physical therapists were not blinded to the group assignment. The intervention group started with lower baseline activity levels than the control group, which could affect comparisons. The study did not exclude patients who were already physically active before surgery, which may have reduced the room for improvement. The intervention targeted total steps rather than intensity, which may not effectively drive changes in moderate-to-vigorous activity. There was notable loss to follow-up at the 12-month mark, limiting confidence in long-term findings.
Declared interests
The authors reported no conflicts of interest.
The easy way to misread this
Do not conclude that physical activity interventions after knee replacement are ineffective. This study tested a specific step-goal intervention targeting total volume, not intensity. The null result may reflect a mismatch between the intervention target (steps) and the primary outcome (moderate-to-vigorous activity), not a failure of behavior change strategies in general.
Summarised by AI from the full paper, without a clinician reviewing it. Check it against the source before it changes what you do. Read it on PubMed →