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MSDs involving the arm and hand account for only 5.1% of all work‐related MSDs (Bureau of Labor Statistics, 2018), and disorders of the hand and wrist constitute 40% and 13%, respectively, of such cases (Bureau of Labor Statistics, 2015). Hand complaints are common among manual workers with self‐reported prevalence generally around 30–45% (Thomsen et al., 2007). Symptoms are not always accompanied by clinical findings. Several studies found very low prevalence of wrist tendinopathy with swelling and/or crepitation but with a considerable variation—from no cases of clinical tenosynovitis at all, up to more than 18%, apparently with more or less the same case definition (Thomsen et al., 2007).

Tendinopathy cases of the hand and wrist (e.g., de Quervain’s tenosynovitis) or fingers (e.g., trigger finger) numbered 4,896 in 2001 (Bureau of Labor Statistics, 2001). Evaluation of the incidence of de Quervain’s disease among U.S. military personnel from 1998 through 2006 demonstrated that women had a significantly (p < 0.0001) higher rate of this disorder (2.8 cases per 1,000 person‐years) compared to men (0.6 cases per 1,000 person‐years). Other risk factors for de Quervain’s disease in this population included age greater than 40 and greater incidence among blacks (Wolf, Sturdivant, & Owens, 2009).

Figure 2.4 The site of de Quervain’s syndrome is encircled. APL: abductor pollicis longus; EPB: extensor pollicis brevis; EPL: extensor pollicis longus.