Pain sensitization as a potentially modifiable factor in people with knee osteoarthritis: insights from behavioral graded activity.
Level 4 - case-series / case-control
Single-arm prospective interventional trial without a control group
PubMed 42440582 · doi:10.3389/fpain.2026.1865792
What was done
A single-arm trial evaluated a 12-week behavioral graded activity (BGA) program in individuals with knee osteoarthritis who had not responded to guideline-concordant exercise. The primary endpoints were the Knee injury and Osteoarthritis Outcome Score (KOOS) pain and activities of daily living (ADL) subscales. Secondary outcomes included pressure pain threshold (PPT at the knee and forearm), temporal summation of pain (TSP), and step count. Baseline radiographs and MRI assessed structural abnormalities as potential effect modifiers. Twenty-six participants completed the intervention, and outcomes were analyzed using linear mixed models.
What was found
The abstract reports no exact numerical values or effect sizes. It reports statistically significant improvements in KOOS pain and ADL subscales exceeding the minimal important change. PPT increased at both the knee and forearm, TSP decreased, and physical activity increased. Baseline step count was positively correlated with KOOS ADL improvement, whereas baseline structural abnormalities and pain sensitization measures were not associated with changes in KOOS outcomes.
Why it matters
These findings suggest that pain sensitization and clinical outcomes may improve after behavioral graded activity in patients with knee osteoarthritis who do not respond to standard exercise programs.
Limits
The study lacked a control or comparator group, precluding causal attribution of changes to the intervention. The sample size was small (n=26), exact point estimates and confidence intervals were omitted from the abstract, and long-term durability beyond 12 weeks was not evaluated.
Cited by
- supports Sub-threshold exercise progression increases the baseline pain threshold through the physiological principle of pain desensitization.