Unfavorable Ankylosis - 3 Digits C&P Exam Prep

Fingertip-to-Proximal Transverse Palmar Crease Gap

What it measures: The distance in centimeters between the fingertip(s) and the proximal transverse crease of the palm when the affected finger(s) are flexed to the maximum extent possible. This is the primary determinant of favorable vs. unfavorable ankylosis for index, long, ring, and little fingers.

What to expect: The examiner will ask you to bend your ankylosed finger(s) as far as possible toward your palm, then use a ruler or caliper to measure the gap between the fingertip and the proximal palmar crease. A gap greater than 5.1 cm (2 inches) indicates unfavorable ankylosis. If both the MCP and PIP joints of a single digit are ankylosed, it is automatically unfavorable regardless of gap measurement.

Pain considerations: If pain limits how far you can flex the ankylosed fingers, communicate this clearly. The examiner should note pain-limited motion. Under DeLuca v. Brown, additional functional loss due to pain must be documented and may increase the effective degree of limitation.

Active Range of Motion (ROM) - MCP, PIP, DIP, and Thumb Joints

What it measures: The degrees of active movement possible at each joint of the affected digits. For ankylosed joints, the angle at which the joint is fixed is documented. Normal MCP flexion is 0-90-; PIP flexion 0-100-; DIP flexion 0-70-; Thumb CMC and IP joints have their own normal ranges.

What to expect: The examiner uses a goniometer to measure the fixed angle of each ankylosed joint and any residual motion in partially affected joints. You will be asked to actively flex and extend each finger. The specific degree values are recorded for each joint. For fully ankylosed joints, only the fixed position angle is recorded - no motion is expected.

Pain considerations: Under 38 CFR 4.40 and 4.45 (DeLuca factors), pain with motion must be documented. If you experience pain at the onset of motion, pain throughout the range, or pain that stops motion, tell the examiner exactly where in the range of motion the pain occurs and how severe it is on a 0-10 scale.

Passive Range of Motion

What it measures: The degrees of movement achievable when the examiner gently moves your finger joints without your active muscular effort. Passive ROM in excess of active ROM indicates muscle weakness or pain-inhibited motion rather than true mechanical joint block.

What to expect: The examiner will gently attempt to move your ankylosed and adjacent finger joints. For truly ankylosed joints, passive motion will equal active motion (zero). If passive ROM exceeds active ROM, the examiner should note this discrepancy. Passive motion testing helps distinguish true bony/fibrous ankylosis from soft-tissue contracture or pain-inhibited motion.

Pain considerations: If passive motion causes pain, state this clearly. Pain on passive motion is relevant to the severity determination and should be documented in the DBQ.

Grip Strength (Dynamometer)

What it measures: The maximum hand grip force in kilograms or pounds. Grip strength reduction in the affected hand compared to the contralateral side reflects functional impairment from ankylosis.

What to expect: You will be asked to squeeze a handheld dynamometer as hard as possible with each hand, typically three times per hand. Results are averaged and compared between hands. Reduced grip strength in the ankylosed hand supports functional loss documentation.

Pain considerations: If squeezing causes significant pain in the ankylosed digits, tell the examiner. Pain-limited grip reflects a DeLuca factor and should be noted as contributing to functional loss beyond the mechanical ankylosis.

Thumb Opposition Gap Measurement

What it measures: For claims involving the thumb as one of the three ankylosed digits: the distance between the thumb pad and the finger pads or palm when attempting maximum opposition. Determines favorable vs. unfavorable thumb ankylosis per M21-1 criteria.

What to expect: The examiner will ask you to bring your thumb toward your fingers as if trying to pinch or oppose, then measure the gap between the thumb pad and the closest finger. A gap >5.1 cm is unfavorable for the thumb.

Pain considerations: If thumb opposition causes pain, state the pain level and whether it limits the movement. Pain-limited opposition should be documented as a DeLuca factor.

50%

Unfavorable ankylosis of three digits including the thumb and any two other fingers of one hand. The dominant hand or a digit combination that severely impacts function.

From 38 CFR: DC 5218: 'Thumb and any two fingers' - 50% (without regard to dominant/non-dominant hand distinction in the rating schedule, though dominance is relevant to functional impact documentation). 38 CFR 4.71a Note: Also consider whether evaluation as amputation is warranted.

40%

Unfavorable ankylosis of three digits in one of these combinations: (1) Index, long, and ring fingers; (2) Index, long, and little fingers; (3) Index, ring, and little fingers. OR: Thumb and any two fingers combination rated at the lower end under specific adjudicative circumstances.

From 38 CFR: DC 5218: 'Index, long, and ring; index, long, and little; or index, ring, and little fingers' - 40%. Also the lower rating for 'Thumb and any two fingers' combination - 40%.

30%

Unfavorable ankylosis of the long, ring, and little fingers (the three ulnar digits) of one hand.

From 38 CFR: DC 5218: 'Long, ring, and little fingers' - 30%.

20%

Unfavorable ankylosis of the long, ring, and little fingers - lower evaluation level. This is the minimum rating for DC 5218 three-digit unfavorable ankylosis.

From 38 CFR: DC 5218: 'Long, ring, and little fingers' - 20% (lower evaluation within the long/ring/little combination).

Pain

How to describe it: Describe pain location (which joints, which fingers), character (aching, sharp, burning, throbbing), severity on a 0-10 scale both at rest and during use, what activities trigger it, and how long it lasts. Distinguish between pain at rest and pain with attempted movement of the ankylosed joints or the hand as a whole.

Example: On my worst days, my ankylosed fingers cause a constant 7/10 aching pain even at rest, which spikes to 9/10 if I accidentally bump the hand or try to use it for anything requiring grip. The pain radiates from the fixed joints up my hand and sometimes into my wrist. It wakes me up at night if I roll onto the hand, and I have to take pain medication before any activity that involves the affected hand.

Examiner listens for: Location and radiation pattern of pain, pain at rest vs. with motion, pain severity with specific activities, whether pain limits motion or use beyond the mechanical restriction of the ankylosis, pain during the exam itself when joints are touched or manipulated.

Avoid: Do not say 'it is not that bad' or minimize pain to seem stoic. Do not report only your best-day pain level. Accurately report your typical and worst-day pain. The examiner needs to document pain that limits function - this is a rated factor under DeLuca.

Weakness

How to describe it: Describe reduced grip and pinch strength in specific terms: what you can no longer hold, lift, or grip that you previously could. Quantify if possible (e.g., 'I can no longer open a jar,' 'I drop objects heavier than a coffee cup,' 'I cannot grip a steering wheel for more than 5 minutes'). Note whether the weakness is constant or worsens with use.

Example: On my worst days my grip on the affected side is so weak I cannot hold a coffee mug with that hand alone. I drop things frequently - keys, utensils, tools. I have had to switch everything to my other hand. My hand gives out immediately when I try to grip a wrench or carry groceries.

Examiner listens for: Specific activities limited by weakness, comparison to the unaffected hand, progressive weakness with repetitive use, whether weakness is present at rest or only with exertion, documented atrophy of intrinsic hand muscles.

Avoid: Do not say 'I can still manage' if you have significantly modified how you perform tasks. Compensatory strategies (using the other hand, using tools) represent functional loss - describe what you cannot do naturally, not just whether the task eventually gets done.

Fatigability and Lack of Endurance

How to describe it: Describe how quickly the hand fatigues with use, how long you can sustain grip or pinch before the hand gives out or becomes painful, and how long recovery takes. Compare to your unaffected hand and to your pre-service or pre-injury baseline.

Example: I cannot perform any repetitive hand activity - typing, writing, using a screwdriver - for more than 2 to 3 minutes before the affected hand becomes too painful and fatigued to continue. It then takes 20-30 minutes of rest before I can attempt again. This severely limits my ability to work, especially tasks that require sustained hand use.

Examiner listens for: Time before fatigue onset, whether fatigue worsens throughout the day, impact on sustained occupational tasks, whether rest relieves fatigue and how much rest is needed.

Avoid: Do not omit fatigue symptoms because they feel less severe than pain or weakness. Fatigability is an explicit DeLuca factor that can increase your rating when properly documented.

Incoordination and Fine Motor Loss

How to describe it: Describe specific fine motor tasks you cannot perform or perform only with great difficulty: buttoning clothing, writing, typing, picking up small objects, using utensils. The ankylosed fingers cannot move independently, affecting dexterity significantly.

Example: I cannot button a shirt or tie a shoe with the affected hand - I have to use my other hand or adaptive equipment. Writing is essentially impossible with the affected dominant hand; I had to re-train myself to write with the non-dominant hand. Picking up small items like coins or pills requires multiple attempts.

Examiner listens for: Specific fine motor tasks affected, adaptive behaviors developed, whether dominant hand is involved, impact on occupational function and daily activities requiring dexterity.

Avoid: Do not omit incoordination because the joints are mechanically fixed rather than spastic. Fixed joints disrupt coordinated hand movement just as severely - describe how the inability to move the digits independently affects your precision tasks.

Flare-Ups

How to describe it: Describe what triggers a flare-up (activity, cold weather, prolonged use, stress on the joint), how often they occur, how long they last, what symptoms worsen during a flare (pain, stiffness, swelling), and how much the flare increases your functional limitation beyond your baseline.

Example: After using my affected hand for even moderate activity, I experience a flare-up lasting 1-3 days where the entire hand swells, pain increases from a baseline of 4/10 to 8-9/10, and I am essentially unable to use the hand at all. During these flares I cannot perform basic self-care tasks with the affected hand and need assistance.

Examiner listens for: Frequency and duration of flare-ups, specific triggers, symptom profile during flares versus baseline, functional limitation during flares, whether flares require additional treatment or activity restriction.

Avoid: Do not fail to mention flare-ups if the examiner does not ask. Under M21-1 and DeLuca, flare-up severity is considered in the rating analysis. If your worst days are significantly worse than your exam-day baseline, this must be on record.

Joint Position and Deformity

How to describe it: Describe the position your ankylosed fingers are fixed in - flexed, extended, rotated, or angulated. Explain how the fixed position prevents you from placing your hand flat on a surface, reaching into a pocket or bag, wearing gloves, or performing other specific tasks.

Example: My index and long fingers are fixed in flexion - they cannot be straightened. This means I cannot place my hand flat on a table, wear a normal glove, type on a keyboard, or reach into a pocket or bag without injuring myself on the curled fingers. The ring finger is fixed in extension, making it impossible to close my hand into a fist.

Examiner listens for: Exact fixed position of each ankylosed joint, whether position causes secondary problems (skin breakdown, contracture of adjacent structures), whether rotation or angulation is present (relevant to amputation-equivalent rating consideration).

Avoid: Do not assume the examiner can see all relevant aspects of your deformity. Verbally describe how the fixed position impacts specific functional tasks even if the deformity is visible on examination.