Causes of musculoskeletal pain in Paget’s disease of bone

Paget’s disease of bone (PDB) is characterised by increased and disorganised bone remodelling leading to various complications, such as bone deformity, deafness, secondary osteoarthritis, and pathological fracture. Pain is the most common presenting symptom of PDB, but it is unclear to what extent this is due to increased metabolic activity of the disease, complications, or unrelated causes. We conducted a cross-sectional study of 168 people with PDB attending secondary care referral centres in the UK. We documented the presence of musculoskeletal pain and sought to determine its underlying causes. Musculoskeletal pain was reported by 122/168 (72.6%) individuals. The most common cause was osteoarthritis of joints distant from an affected PDB site in 54 (44.3%), followed by metabolically active PDB in 18 (14.7%); bone deformity in 14 (11.4%); osteoarthritis of a joint neighbouring an affected site in 11 (9.0%), neuropathic pain in 10 (8.2%), and various other causes in the remainder. Pain was more common in women (p