IntroductionTrapeziometacarpal (TMC) arthrosis is an expected part of normal human aging. 5,34 Symptoms and disability associated with TMC arthrosis are typically measured with upper extremityspecific disability questionnaires such as the Disabilities of the Arm, Shoulder and Hand (DASH), its shorter version, the QuickDASH, the Patient-Rated Wrist (Hand) Evaluation (PRW(H)E), and the Michigan Hand Questionnaire (MHQ), or with osteoarthritis specific measures such as the Australian/ Canadian (AUSCAN) Osteoarthritis Hand Index. 31 Although widely used and validated for use in patients with TMC arthrosis, 30,31 the aforementioned questionnaires were not developed specifically for TMC arthrosis and face several limitations. For example, the DASH and QuickDASH scores do not discriminate between symptoms/disability associated with TMC arthrosis and other hand, arm or shoulder function/disability concerns. 31 The 15-item PRW(H)E addresses this issue by including 4 items about difficulty with usual activities (personal care, household work, work/ occupation, and recreational activities) during the past week that should be rated in comparison with the time before the wrist problem started; however, a range of other problems that are not TMC arthrosis related could very well affect response to these items. 28 These three questionnaires also reflect both the affected and the non-affected limb, 20 which can confound the total score. In contrast, the MHQ is a handspecific outcomes questionnaire that adjusts for hand dominance, and can distinguish between the left and right hand. 11
AbstractBackground: Symptoms and disability at the trapeziometacarpal (TMC) joint are typically assessed with general measures that may not be able to accurately discriminate between TMC arthrosis-specific versus other hand and arm condition concerns. The objective was to develop and preliminary validate the Trapeziometacarpal Arthrosis Symptoms and Disability (TASD) questionnaire designed to assess symptoms and disability at the TMC joint. Methods: English-speaking patients (50 years or older) were enrolled in 1 of 2 samples (sample 1, 64 patients specifically presented for treatment of TMC arthrosis; sample 2, 64 patients received an incidental diagnosis of previously undiagnosed TMC arthrosis when presenting for treatment of another, not thumb-related condition). Principal component analysis identified the number of subscales (factors) and factor loadings of all items (ie, structural construct validity). Internal consistency was assessed with Cronbach alpha. Convergent, discriminant, and known-groups construct validity of the subscales were assessed with Spearman correlations. Results: The final TASD has 12 items and 2 subscales, as confirmed by principal component analysis: symptoms (7 items) and disability (5 items). The subscales' internal consistency was good to excellent in both samples. The TASD showed good convergent validity as evidenced by moderate to strong correlations between both subscales and upper extremity disability, pain intens...