Unfavorable Ankylosis - 4 Digits C&P Exam Prep

Fingertip-to-Proximal Transverse Palmar Crease Gap (Finger Flexion Gap)

What it measures: The distance in centimeters between the fingertip and the proximal transverse crease of the palm when the affected finger(s) are flexed to the maximum extent possible. This is the single most critical measurement for distinguishing favorable from unfavorable ankylosis.

What to expect: The examiner will ask you to flex your affected fingers as far as possible toward your palm and will measure the gap. A gap greater than 2 inches (5.1 cm) establishes unfavorable ankylosis.

Pain considerations: Under DeLuca, if pain prevents full flexion, the gap at the pain endpoint counts. Tell the examiner exactly where the pain stops your motion and have them document the pain endpoint.

Active Range of Motion (AROM) - Each Ankylosed Joint

What it measures: The voluntary movement you can perform at each affected joint (MCP, PIP, DIP, CMC for thumb, IP for thumb). Documented in degrees of flexion and extension.

What to expect: The examiner uses a goniometer to measure flexion and extension at each joint of each affected digit. They will ask you to move each finger/thumb independently. Normal MCP flexion is 90-, PIP flexion is 100-, DIP flexion is 70-. Ankylosis means the joint is essentially fixed - expect 0- of motion or very limited motion documented.

Pain considerations: Per DeLuca v. Brown, pain that limits motion must be documented. If the joint is not fully ankylosed but pain prevents movement, request that the examiner note painful motion and the degree at which pain begins.

Passive Range of Motion (PROM) - Each Ankylosed Joint

What it measures: The movement achievable when the examiner moves the joint without your muscular effort. In true ankylosis, passive and active ROM will be the same (both near zero).

What to expect: The examiner will gently attempt to move your fingers. In unfavorable ankylosis, passive motion should be equal to active motion (both severely limited). If passive ROM is greater than active ROM, that may indicate pain inhibition rather than structural ankylosis.

Pain considerations: If passive motion causes pain, say so clearly. Pain on passive motion is a clinically significant finding that supports the severity of your ankylosis.

Grip Strength (Hand Grip Dynamometry)

What it measures: The overall grip strength of the affected hand compared to the contralateral side, measured in pounds or kilograms.

What to expect: You will be asked to squeeze a dynamometer handle. The examiner records grip strength for the affected hand and often the unaffected hand for comparison. Significantly reduced grip strength supports functional impairment.

Pain considerations: Pain during grip testing is significant - state it clearly so the examiner documents it.

Thumb-Pad to Finger Opposition Gap (Thumb Ankylosis Only)

What it measures: For thumb involvement, measures the gap between the thumb pad and the fingers when the thumb attempts opposition. Greater than 2 inches (5.1 cm) = unfavorable ankylosis of the thumb.

What to expect: If the thumb is one of the four affected digits, the examiner will ask you to bring your thumb tip toward the fingers as far as possible and measure the gap.

Pain considerations: Pain preventing full opposition must be documented. Tell the examiner the opposition is limited by pain and where the pain is located.

Muscle Atrophy Measurement (Circumference)

What it measures: Circumference of the affected upper extremity at a specified location compared to the opposite side to document muscle atrophy from disuse.

What to expect: The examiner may measure the circumference of your forearm or hand and compare to the opposite side. Atrophy supports chronic disability and functional loss.

Pain considerations: Atrophy is objective evidence of long-term disuse consistent with severe ankylosis - ensure the examiner documents it.

60%

Unfavorable ankylosis of four digits including the thumb and any three fingers (e.g., thumb + index + long + ring, or thumb + index + long + little, or thumb + index + ring + little, or thumb + long + ring + little). Dominant hand.

From 38 CFR: 38 CFR 4.71a DC 5217: 'Thumb and any three fingers' - dominant hand rated at 60%. Unfavorable ankylosis requires gap >2 inches (5.1 cm) or both joints of a digit ankylosed.

50%

Either: (A) Unfavorable ankylosis of thumb and any three fingers - non-dominant hand; OR (B) Unfavorable ankylosis of index, long, ring, and little fingers (without thumb) - dominant hand.

From 38 CFR: 38 CFR 4.71a DC 5217: 'Thumb and any three fingers' non-dominant, OR 'Index, long, ring, and little fingers' dominant = 50%.

40%

Unfavorable ankylosis of index, long, ring, and little fingers (without thumb) of the non-dominant hand.

From 38 CFR: 38 CFR 4.71a DC 5217: 'Index, long, ring, and little fingers' non-dominant hand = 40%.

Joint Position and Structural Ankylosis

How to describe it: Describe exactly which joints feel completely locked. State that your finger(s) are fixed - they do not move at all or move only a few degrees. Specify whether the joint is stuck in a bent position (flexion) or a straight/extended position, and whether the finger points in an abnormal direction (rotation or angulation).

Example: On my worst days, my index, long, ring, and little fingers are completely rigid - I cannot bend them at all at the knuckle joints, and the fingers stay bent at about 45 degrees, pointing slightly to the side. When I try to make a fist, my fingertips cannot come within four inches of my palm.

Examiner listens for: Fixed joint position, inability to flex or extend, abnormal resting position of the digit, gap measurement that exceeds 5.1 cm, presence of both MCP and PIP fixation in the same digit.

Avoid: Do not say 'my fingers are a little stiff' - if they are truly ankylosed, say they are locked or fixed in position. Do not downplay the gap - if it is more than 2 inches, describe it clearly.

Pain (DeLuca Factor)

How to describe it: Describe pain with movement, at rest, with gripping, and during flare-ups. Include location (which joint, which finger), character (sharp, aching, burning), severity (0-10 scale), and what triggers or worsens it.

Example: On my worst days, even gentle contact with the affected fingers causes sharp pain rated 8/10. The pain wakes me at night if I accidentally flex the hand. Any attempt to grip something as thin as a pen causes immediate sharp pain at the knuckle joints.

Examiner listens for: Pain on motion, pain on passive motion, pain at rest, pain that limits functional activities, pain severity and character, relationship between pain and functional loss.

Avoid: Do not say 'it is uncomfortable' - say it is painful. Do not say 'it hurts a little' if it is severe pain. Describe your actual worst-day experience, not your average or minimized experience.

Fatigability and Weakness (DeLuca Factor)

How to describe it: Explain how quickly hand strength gives out with use. Describe what you can no longer do because the hand fatigues or because you have no grip. Include examples from daily life.

Example: I can no longer open jars, turn doorknobs, button shirts, or use a keyboard for more than a few minutes before the hand becomes too weak and painful to continue. I drop objects frequently because I cannot maintain grip.

Examiner listens for: Loss of grip endurance, inability to sustain holding tasks, dropping objects, avoidance of activities requiring grip or pinch.

Avoid: Do not say 'I manage fine most of the time' - describe the specific tasks you can no longer perform or perform with great difficulty.

Incoordination (DeLuca Factor)

How to describe it: Describe any loss of fine motor control. Include difficulty with precision tasks such as buttoning, writing, typing, picking up small objects, or handling coins.

Example: I cannot pick up a coin from a flat surface, button a shirt, or hold a pen steadily enough to write legibly because the ankylosed fingers cannot perform the small movements required.

Examiner listens for: Loss of dexterity, inability to perform precision tasks, compensatory strategies (using other hand, adaptive devices).

Avoid: Do not say 'it is just slow' if you truly cannot perform precision tasks - say you cannot do them at all or only with great difficulty and adapted technique.

Flare-Ups (DeLuca Factor)

How to describe it: Describe episodes when the condition worsens beyond baseline. Include frequency, duration, triggers (cold, overuse, weather), and what additional functional loss occurs during flare-ups. Quantify additional ROM loss if possible.

Example: I have flare-ups two to three times per week, lasting one to two days, triggered by cold weather or any attempt to use the hand. During flare-ups, even the slight residual movement I normally have disappears and the pain increases to 9/10. I cannot use the hand for anything.

Examiner listens for: Frequency and duration of flare-ups, additional functional loss during flare-ups, triggers, ROM loss during flare-ups that exceeds baseline measurement.

Avoid: Do not say 'I have occasional flare-ups' without describing them in detail. The examiner needs specific frequency, duration, and impact to document them properly.

Functional Impact on Activities of Daily Living and Occupation

How to describe it: Give specific examples of activities you can no longer do or do with significant difficulty. Include work tasks, self-care, household tasks, and recreational activities. Be specific about which tasks and why they are impaired.

Example: I cannot type, write, cook, drive, perform personal hygiene properly, or perform my former job duties as a [job title] because all four fingers of my dominant hand are locked. I use my opposite hand for almost everything and have dropped several items including hot pots causing burns.

Examiner listens for: Specific functional limitations linked to the ankylosed digits, occupational impact, adaptive strategies, safety concerns.

Avoid: Do not give vague answers like 'it limits what I can do.' Give specific, concrete examples of tasks that are impossible or severely impaired.