noun
arthrology
Medical term for the study of joints, their structure, function, and diseases.
関節学は整形外科の基礎分野の一つです。
Arthrology is one of the basic fields of orthopedic surgery.
関節 means 'joint' (the body part), while 関節学 is the academic study of joints.
Compound of 関節 (joint) + 学 (study, -ology).