Background: Some guidelines recommend splinting for base-of-thumb osteoarthritis, despite lack of evidence of efficacy.
Objective: To assess the efficacy and acceptability of a splint for base-of-thumb osteoarthritis.
Design: Multicenter, randomized trial. Randomization was computer-generated, and allocation was concealed by faxing centralized treatment assignment to investigators at the time of enrollment. Patients and investigators were not blinded to assignment, and patients self-reported outcomes.
Setting: 2 tertiary care hospitals in France.
Patients: 112 patients (101 women) with base-of-thumb osteoarthritis.
Intervention: Custom-made neoprene splint (nÂ = 57) or usual care (nÂ = 55).
Measurements: Primary outcome was change in pain level assessed on a visual analogue scale (VAS) (range, 0 to 100 mm) from baseline to 1 month. Secondary outcomes were change in measures of hand disability at 1 month and change in pain level and measures of disability at 12 months. Tolerance and adherence with the splint were recorded.
Results: At 1 month, no difference in change occurred in pain level from baseline in the intervention and control groups (adjusted mean change, âˆ’10.1 vs. âˆ’10.7; between-group difference, 0.6 [95% CI, âˆ’7.9 to 9.1]; PÂ = 0.89). Disability was assessed by the Cochin Hand Function Scale score (range, 0 to 90) or patient-perceived disability (VAS, 0 to 100 mm). At 12 months, change in pain from baseline was greater in the intervention group than in the control group (adjusted mean change, âˆ’22.2 vs. âˆ’7.9; between-group difference, âˆ’14.3 [CI, âˆ’23.4 to âˆ’5.2]; PÂ = 0.002). The Cochin Hand Function Scale score was âˆ’1.9 versus 4.3 (between-group difference, âˆ’6.3 [CI, âˆ’10.9 to âˆ’1.7]; PÂ = 0.008) and patient-perceived disability was âˆ’11.6 versus 1.5 (between-group difference, âˆ’13.1 [CI, âˆ’21.8 to âˆ’4.4]; PÂ = 0.003). At 12 months, 86% of the intervention group had worn the splint for more than 5 nights a week, and no adverse effects were observed.
Limitation: Patients, health care providers, and outcome assessors were not blinded.
Conclusion: For patients with base-of-thumb osteoarthritis, wearing a splint had no effect on pain at 1 month but improved pain and disability at 12 months.
Primary Funding Source: Programme Hospitalier de Recherche Clinique National.