The middle digits, which support most of its weight, are extended at the metacarpophalangeal joints and bent at the interphalangeal joints.
As the tendons cross the interphalangeal joints, they furnish them with dorsal ligaments.
They have vestigial second and fifth metacarpals, and their palm extends to the distal interphalangeal joints.
The phalanx bones of the toe join to the metatarsal bones of the foot at the interphalangeal joints.
Often their digits will be abnormally short, and the fingers are commonly missing an interphalangeal joint.
Flexion at the proximal interphalangeal joints of digits 45 is weakened, but flexion at the metocarpophalangeal joints and distal interphalangeal joints remains intact.
Using splints will initiate flexion in the metacarpophalangeal joints while also allowing extensions and flexion in the interphalangeal joints, thus increasing range of motion.
The best examples of ginglymus are the interphalangeal joints and the joint between the humerus and ulna.
