Finger Ankylosis vs. Limitation of Motion: VA Rating and Criteria Comparison

The VA rating schedule strictly distinguishes between joint ankylosis and limitation of motion. Ankylosis refers to complete immobility or bony or fibrous fusion of a joint, resulting in zero remaining range of motion. Limitation of motion, by contrast, describes a joint that retains some degree of movement, but whose arc of flexion or extension is abnormally restricted. Because complete fusion alters hand mechanics more severely than partial stiffness, ankylosis generally commands higher schedular ratings.

Under 38 CFR 4.71a, ankylosis ratings depend on whether digits are fixed in a favorable or unfavorable position. Favorable ankylosis occurs when a joint is fused at an angle that preserves functional utility, such as slight flexion that allows the veteran to oppose the thumb and fingers for grasping objects. Unfavorable ankylosis occurs when joints are fixed in full extension, excessive flexion, or abnormal lateral deviation that obstructs grasping or interferes with adjacent digits.

Ankylosis of multiple fingers is evaluated under DC 5216 through 5223, with ratings climbing from 10% up to 60% for the major hand depending on the number of fused digits and their position. In contrast, limitation of motion does not have dedicated multi-digit combination codes; it is evaluated individually under DC 5228 (thumb, up to 20%), DC 5229 (index or long finger, up to 10%), and DC 5230 (ring or little finger, flat 0%). Multiple digits with limitation of motion are rated separately and combined under 38 CFR 4.25.

A common area of confusion is the rating ceiling for the ring and little fingers. Under both DC 5227 (ankylosis) and DC 5230 (limitation of motion), isolated ring or little finger conditions rate at 0%, regardless of whether ankylosis is favorable or unfavorable. However, when the ring or little finger is ankylosed in combination with the thumb, index, or long finger under DC 5216 through 5223, their involvement increases the multi-digit percentage evaluation significantly.

Ankylosis does not automatically receive an amputation evaluation merely because ankylosis exists. However, 38 CFR 4.71a contains specific ankylosis configurations that expressly direct evaluation as amputation. Under the general rating instructions for finger ankylosis, if both the metacarpophalangeal (MCP) and proximal interphalangeal (PIP) joints of a digit are ankylosed and either joint is fixed in extension or full flexion, or if there is rotational deformity or angulation, the schedule directs adjudicators to evaluate the digit as amputation under DC 5153 through 5156. Similar mandatory amputation evaluation rules apply to the thumb when multiple joints are unfavorable. Conversely, for multi-digit ankylosis under DC 5216 through 5219, schedule notes instruct raters to consider whether evaluation as amputation is warranted as an adjudicative cross-check and ceiling. Adjudicators must also consider whether severe ankylosis impairs adjacent healthy digits or interferes with overall hand function under 38 CFR 4.40 and 4.45.