Metacarpophalangeal impairment in hand osteoarthritis is not rare and is associated with mechanical factors: Results from the DIGICOD hand osteoarthritis cohort.

In this cross-sectional study using a hospital-based HOA cohort, radiographic MCP OA was frequent and associated with structural HOA features rather than with symptom severity. Our results suggest that the involvement of MCP joints in HOA is predominantly related to mechanical rather than systemic factors in this population.