Alessandro Chiarotto1, Cesar Fernandez-de-Las-Peñas2, Matteo Castaldo3, Stefano Negrini4, Jorge Hugo Villafañe5. 1. Department of Research, A.I.FI. Piemonte Valle d' Aosta, Turin, Italy. 2. Department of Physical Therapy, Occupational Therapy, Rehabilitation and Physical Medicine, Universidad Rey Juan Carlos, Alcorcón, Madrid Spain ; Esthesiology Laboratory, Universidad Rey Juan Carlos, Alcorcón, Spain. 3. Parma, Italy. 4. Physical and Rehabilitation Medicine, University of Brescia, Brescia, Italy ; IRCCS Don Gnocchi Foundation, Milan, Italy. 5. IRCCS Don Gnocchi Foundation, Milan, Italy ; Regione Generala 11/16, 10045 Piossasco, Turin Italy.
Abstract
BACKGROUND: Widespread pressure hypersensitivity is one of the signs that characterize central pain sensitization in subjects with knee and hip osteoarthritis (OA). The purpose of this study was to evaluate whether widespread pressure pain hyperalgesia is a feature of individuals with unilateral symptomatic thumb carpometacarpal (CMC) OA. METHODS: A total of 16 patients with unilateral symptomatic thumb CMC OA and 16 healthy sex- and age-matched controls were recruited. Pressure pain thresholds (PPTs) were assessed bilaterally over the first CMC joint; the C5-C6 zygapophyseal joint; the median, ulnar, and radial nerves; and tibialis anterior muscle. Grip and key strength, intensity of pain, and function QuickDASH were also measured. RESULTS: The analyses showed that patients with thumb CMC OA present bilaterally decreased PPTs over the first CMC joint, the C5-C6 zygapophyseal joint, and the tibialis anterior, median, ulnar and radial nerve as compared to controls (all, P < 0.01). Patients with thumb CMC OA also exhibited a bilateral reduction in pinch and grip strength than controls (P < 0.05). A significant correlation was found between PPT over the radial nerve and QuickDASH (r = 0.546, P = 0.029). CONCLUSION: This study revealed bilateral widespread pressure pain hypersensitivity in individuals with unilateral symptomatic thumb CMC OA, suggesting that central pain processing mechanisms might be a feature of this pain population. These results should be taken into consideration when addressing future treatment approaches.
BACKGROUND: Widespread pressure hypersensitivity is one of the signs that characterize central pain sensitization in subjects with knee and hip osteoarthritis (OA). The purpose of this study was to evaluate whether widespread pressure pain hyperalgesia is a feature of individuals with unilateral symptomatic thumb carpometacarpal (CMC) OA. METHODS: A total of 16 patients with unilateral symptomatic thumb CMC OA and 16 healthy sex- and age-matched controls were recruited. Pressure pain thresholds (PPTs) were assessed bilaterally over the first CMC joint; the C5-C6 zygapophyseal joint; the median, ulnar, and radial nerves; and tibialis anterior muscle. Grip and key strength, intensity of pain, and function QuickDASH were also measured. RESULTS: The analyses showed that patients with thumb CMC OA present bilaterally decreased PPTs over the first CMC joint, the C5-C6 zygapophyseal joint, and the tibialis anterior, median, ulnar and radial nerve as compared to controls (all, P < 0.01). Patients with thumb CMC OA also exhibited a bilateral reduction in pinch and grip strength than controls (P < 0.05). A significant correlation was found between PPT over the radial nerve and QuickDASH (r = 0.546, P = 0.029). CONCLUSION: This study revealed bilateral widespread pressure painhypersensitivity in individuals with unilateral symptomatic thumb CMC OA, suggesting that central pain processing mechanisms might be a feature of this pain population. These results should be taken into consideration when addressing future treatment approaches.
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