Lack of full passive range of motion (restrictions in flexion, extension, or other movements) of the thumb joint resulting from structural changes of non-bony tissues, such as muscles, tendons, ligaments, joint capsules and/or skin. The term camptodactyly is used if the distal and/or proximal interphalangeal joints are affected. [https://orcid.org/0000-0002-0736-9199, PMID:16214063, PMID:24975760, PMID:31282072]
