noun
Medical term for degenerative joint disease; used in clinical contexts.
変形性関節症は高齢者に多く見られる疾患です。
Osteoarthritis is a condition commonly seen in the elderly.
関節炎 is a broader term for arthritis (joint inflammation), while 変形性関節症 specifically refers to osteoarthritis, a degenerative form.
Compound of 変形性 (deformity-type) + 関節 (joint) + 症 (disease), a calque from medical terminology.