Investigating performance-based hand functions in patients with systemic sclerosis

Objective Systemic sclerosis (SSc) is a connective tissue disorder characterized by collagen deposits in various organs. Skin involvement is one of the most common symptoms and along with vascular damage, may deteriorate hand functions. However, the status of hand functions has generally been investigated using patient-reported measures in patients with SSc. The aim of the present study was to investigate performance-based hand functions in patients with SSc using the Sollerman Hand Function Test (SHFT). Methods A total of 39 patients with SSc (33 females) were included in the study. Twenty-four patients were classified as limited cutaneous SSc (lcSSc), while 15 patients were classified as diffuse cutaneous SSc (dcSSc). Hand-related physical characteristics were evaluated using the Modified Hand Mobility in Scleroderma Test, grip strength, and pinch strengths. The Duruoz Hand Index (Cochin Hand Functional Disability Scale), Disability of Arm, Shoulder, and Hand Questionnaire, Health Assessment Questionnaire, and Scleroderma Health Assessment Questionnaire were used as patient-reported measures. Performance-based hand functions were evaluated using SHFT. Results No significant differences were observed between lcSSc and dcSSc subtypes regarding performance-based and patient-reported hand functions (p > 0.05). SHFT scores significantly correlated with hand-related physical characteristics and patient-reported hand functions (p < 0.05). The highest correlation was determined between SHFT and the Duruoz Hand Index (rho: -0.652, p < 0.001). Conclusion According to our results, performance-based hand functions seem not to be affected by disease subtype. Performance-based hand functions may partially be captured by the patient-reported outcomes, especially the Duruoz Hand Index, in patients with SSc.