As regards the joints the factors of disability reside in reductions
of their normal excursion of movements in different planes. Inquiry will be
directed to these considerations:
(a) Less movement than normal (due to ankylosis, limitation or
blocking, adhesions, tendon-tie-up, contracted scars, etc.).
(b) More movement than normal (from flail joint, resections, nonunion
of fracture, relaxation of ligaments, etc.).
(c) Weakened movement (due to muscle injury, disease or injury of
peripheral nerves, divided or lengthened tendons, etc.).
(d) Excess fatigability.
(e) Incoordination, impaired ability to execute skilled movements
smoothly.
(f) Pain on movement, swelling, deformity or atrophy of disuse.
Instability of station, disturbance of locomotion, interference with
sitting, standing and weight-bearing are related considerations. For the
purpose of rating disability from arthritis, the shoulder, elbow, wrist,
hip, knee, and ankle are considered major joints; multiple involvements of
the interphalangeal, metacarpal and carpal joints of the upper extremities,
the interphalangeal, metatarsal and tarsal joints of the lower extremities,
the cervical vertebrae, the dorsal vertebrae, and the lumbar vertebrae, are
considered groups of minor joints, ratable on a parity with major joints.
The lumbosacral articulation and both sacroiliac joints are considered to
be a group of minor joints, ratable on disturbance of lumbar spine
functions.
Supplement Highlights reference: 37(1)