Background Rhizarthrosis is an inflammatory degenerative joint disease affecting the trapeziometacarpal joint. The main symptom is pain, leading to difficulty with hand functions and reduced quality of life. Two randomized controlled trials found in the literature reported similar findings in terms of pain reduction and improved hand function with the use of a short orthosis for rhizarthrosis; one of the trials showed the benefits when the device was used for daytime function while the other showed the benefits when the orthosis was used during nighttime rest.
Objectives To compare the effectiveness of functional (daytime) and night splint (Figure 1) in reducing pain and improving functionality in patients with rhizarthrosis.
Methods A controlled, randomized, blinded clinical trial with sixty patients diagnosed with rhizarthrosis. The patients were assessed by a blinded assessor at the beginning of the treatment and after 45, 90, 180 and 360 days the following variables were evaluated: pain at the base of the thumb using a a numerical pain scale; thumb range of motion measured using a goniometer; grip strength evaluated by a hydraulic hand dynamometer; pinch strength using the pinch gage; hand dexterity evaluated with the pick-up test; function evaluated by the Brazilian version of the AUSCAN LK 3.01 Hand Osteoarthritis Index, the Cochin Hand Function Scale, the Michigan Hand Outcomes Questionnaire and a Likert-type scale. The Hand Outcomes Questionnaire, Cochin Scale and Michigan Questionnaire were used to assess hand function and patient satisfaction using a Likert scale.
Results Most of the variables analyzed, including patient characteristics such as age, gender, disease duration and hand dominance, were homogeneous at the beginning of the study. In both groups there was a reduction in hand pain with time (intragroup analysis). Pain in the functional group, expressed as mean ± standard deviation, was 6.82±1.72 and 4.77±2.45 at the beginning and end of the treatment, respectively, and the corresponding figures for the nighttime group were 7.20±1.63 and 4.83±2.68. The p values for both groups were p<0.001. There were no statistically significant differences in the majority of the parameters assessed between the groups, including the outcome pain. Three measures considered to be occasional, presented a significant difference between the groups: right palmar abduction p=0.023 and right tripod pinch strength p=0.006 with better results for the group that used the night splint; and time execution of the pick-up test with eyes closed to the right hand p=0.048 with more representative results for the functional (daytime) splint use.
Conclusions There was no statistically significant difference between functional and night splint in terms of pain, function or any of the other parameters assessed in rhizarthrosis patients after one year of treatment.
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Disclosure of Interest None declared
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