The Association Between Patient Characteristics and Pain, Physical Function, and Quality of Life Among Patients with Hip Osteoarthritis: Explorative Study with Data from a Randomized Controlled Trial.
Jesper L Jensen, Agnes G Larsen, Frederik N Foldager and 2 others
In 159 patients with hip OA, greater leg muscle power was associated with better pain, function, and quality of life scores, while analgesic use was associated with worse scores.
The authors caution these are exploratory associations, not evidence of cause.
Key findings
1Greater leg extensor muscle power was associated with better HOOS Pain, QoL, ADL, and 30-second Chair Stand Test scores. The association was strongest for the objective physical function measure (30s-CST), where a 24.7-watt difference in muscle power corresponded to a minimal important difference.
2Analgesic use was associated with worse HOOS Pain, QoL, and ADL scores. The authors note this is likely confounding by indication: patients with more severe symptoms are more likely to take analgesics, rather than analgesics causing worse outcomes.
3Hospital-recruited patients had lower HOOS Pain (mean 54.22 vs 59.73) and lower HOOS ADL (mean 57.94 vs 66.60) than clinic-recruited patients, but the authors state these differences are small relative to the minimal important difference and that the hospital group consisted of patients who declined or were not found eligible for surgery.
Still to come
How it was doneWhat they foundWhat it means for PTs
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What it does not show
Explorative design examining many outcomes, creating substantial risk of false-positive findings Sample size was calculated for the original trial, not for this secondary analysis, so statistical power for these specific associations is uncertain Cross-sectional baseline data: no causal inferences are possible Most confidence intervals overlap the threshold of no clinically relevant difference Physical activity level and several outcomes are patient-reported, adding classification uncertainty Categorization of symptom duration, education, and physical activity is broad The analgesic finding is likely confounding by indication rather than a true effect The counterintuitive physical activity finding (low activity associated with better outcomes) may be spurious or reflect that highly active patients feel more limited by their disability The hospital group consisted of patients who declined or were not found eligible for surgery, which may explain the small differences from the clinic group
Declared interests
The authors report no financial or non-financial competing interests.
The easy way to misread this
Do not read the muscle power association as proof that a strengthening programme will reduce pain or improve function. This is a cross-sectional analysis of baseline data from one trial, the authors state that causal inferences are not possible, and most confidence intervals overlap the threshold of no clinically relevant difference.
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 →