§
## Subpart 1.

## General.

§
### A.

Permanent partial impairment of fingers is a disability of the whole body is as provided in subparts 2 to 4. The percent of whole body disability under this part may not exceed the percent of whole body disability for amputation of the hand or digit if the impairing condition is confined to a digit under part 5223.0540. Each mutually exclusive impairing condition must be rated separately and the ratings must be combined as described in part 5223.0300, subpart 3, item E. If an impairing condition is represented by a category designated as exclusive under subpart 2, it must be rated by that category only and that rating may not be combined with a rating under any other category of this part for that impairing condition.

If an impairing condition is represented by a category designated as combinable under subpart 3, it must be rated under that category and under the appropriate categories describing loss of function under subpart 4. The ratings obtained must be combined as described in part 5223.0300, subpart 3, item E.

If an impairing condition is not represented by a category designated either exclusive or combinable, it must be rated only under the appropriate categories describing loss of function under subpart 4.

§
### B.

For purposes of computing the percent of disability due to injuries of the digits, each digit and each joint of each digit is assigned a percentage representing the percent of disability of the whole body resulting from 100 percent disability of that digit or joint. In subparts 2, item D; 3; and 4, the final percent disability of the whole body is computed by multiplying the overall percent disability to the digit or joint times the values listed in this subpart.

§
## Subp. 2.

## Exclusive categories.

§
### A.

Mallet deformity, loss of active extension at distal interphalangeal joint of 30 degrees or more, substantiated by objective clinical findings, and persisting despite therapy, or recurring and persisting after attempted surgical correction:

§
### B.

Boutonniere deformity, flexion of the proximal interphalangeal joint of 30 degrees or more and extension of the distal interphalangeal joint, which can be reduced passively but not actively, substantiated by objective clinical findings, and persisting despite treatment, or recurring and persisting after attempted surgical correction:

§
### C.

Swan neck deformity, hyperextension of the proximal interphalangeal joint exceeding 15 degrees or more and flexion of the distal interphalangeal, which can be reduced passively but not actively, substantiated by objective clinical findings; and persisting despite treatment, or recurring and persisting after attempted surgical correction:

§
## Subp. 3.

## Combinable categories.

§
### A.

Ulnar or radial deviation at a joint: permanent fixed deformity, measured with joint at neutral position:

§
### D.

Intrinsic tightness: measured by hyperextending the digit at the metacarpophalangeal joint and then attempting to flex the proximal interphalangeal joint, and persisting despite therapy, or recurring and persisting after attempted surgical correction:

§
### E.

Triggering: substantiated by objective clinical findings, and persisting despite therapy, or recurring and persisting after attempted surgical correction:

§
### F.

Fracture or dislocation involving metacarpal or phalanx not otherwise ratable under subpart 3 or 4, zero percent.

§
## Subp. 4.

## Categories describing loss of function.

Function of the hand and fingers is measured by the available passive range of motion at each joint and by the quality and extent of tactile sensation in the hand. For injuries involving lacerated tendons, the available active range of motion is measured and applied to items A to H.

The passive range of motion at all joints of the digits excluding the carpometacarpal joint of the thumb is measured in one arc: flexion or extension. Examination with goniometer is performed to determine the limits of passive range of motion at each of these joints. The passive range of motion of the carpometacarpal joint of the thumb is measured by three movements of the thumb: extension or abduction, radial abduction, and opposition. Examination with a metric ruler is performed to determine the passive limitations of each of the movements of the carpometacarpal joint of the thumb.

For the thumb, all appropriate ratings for loss of motion at the interphalangeal, metacarpal, and carpometacarpal joints are added to determine the overall rating for loss of motion of the thumb. This overall rating for loss of motion of the thumb is multiplied by the value of the thumb as provided in subpart 1, item B, subitem (1), to find the whole body disability for loss of motion of the thumb.

For the fingers, ratings for loss of motion at different joints of the same finger are combined to determine the overall rating for loss of motion of the finger. The overall rating for loss of motion of a finger is multiplied by the value of the finger as provided in subpart 1, item B, subitem (1), to find the whole body disability for loss of motion of that finger.

When there is injury to more than one digit, the disabilities for loss of motion of each affected digit are added to determine the overall disability for loss of motion of the hand.

The quality and extent of tactile sensation is evaluated according to part 5223.0410, subpart 6.

Any disability for loss of sensation is combined with any overall disability for loss of range of motion to determine the final disability for loss of function.

§
### A.

Extent of range of flexion or extension at metacarpophalangeal joint for fingers excluding the thumb:

§
#### (1)

extension is greater than zero degrees and flexion is:

§
##### (e)

less than zero degrees, that is, there is an extension contracture, 60 percent of the value of the digit;

§
#### (2)

extension is limited to between zero degrees and nine degrees flexion, that is, there is a flexion contracture, and flexion is:

§
#### (3)

extension is limited to between ten degrees and 30 degrees flexion, that is, there is a flexion contracture, and flexion is:

§
#### (4)

extension is limited to between 31 degrees and 60 degrees flexion, that is, there is a flexion contracture, and flexion is:

§
#### (5)

extension is limited to between 61 degrees and 80 degrees flexion, that is, there is a flexion contracture, and flexion is:

§
#### (6)

extension is limited to greater than 80 degrees flexion, that is, there is a flexion contracture, 100 percent of the value of the digit;

§
#### (7)

ankylosis, as defined in part 5223.0310, subpart 7, of the metacarpophalangeal joint for the fingers excluding the thumb occurs:

§
##### (c)

between 31 degrees of flexion and 60 degrees of flexion, 60 percent of the value of the digit;

§
##### (d)

between 61 degrees of flexion and 80 degrees of flexion, 80 percent of the value of the digit;

§
### B.

Extent of range of flexion or extension and the proximal interphalangeal joint for fingers excluding the thumb:

§
#### (1)

extension is greater than zero degrees and flexion is:

§
##### (e)

less than zero degrees, that is, there is an extension contracture, 80 percent of the value of the digit;

§
#### (2)

extension is limited to between zero degrees and nine degrees flexion, that is, there is a flexion contracture, and flexion is:

§
#### (3)

extension is limited to between ten degrees and 45 degrees flexion, that is, there is a flexion contracture, and flexion is:

§
#### (4)

extension is limited to between 46 degrees and 60 degrees flexion, that is, there is a flexion contracture, and flexion is:

§
#### (5)

extension is limited to between 61 degrees and 90 degrees flexion, that is, there is a flexion contracture, and flexion is:

§
#### (6)

extension is limited to greater than 90 degrees flexion, that is, there is a flexion contracture, 80 percent of the value of the digit;

§
### C.

Extent of range of flexion or extension at the distal interphalangeal joint for fingers excluding the thumb:

§
#### (1)

extension is greater than zero degrees and flexion is:

§
##### (c)

less than zero degrees, that is, there is an extension contracture, 45 percent of the value of the digit;

§
#### (2)

extension is limited to between zero degrees and nine degrees flexion, that is, there is a flexion contracture, and flexion is:

§
#### (3)

extension is limited to between ten degrees and 45 degrees flexion, that is, there is a flexion contracture, and flexion is:

§
#### (4)

extension is limited to greater than 45 degrees flexion, that is, there is a flexion contracture, 45 percent of the value of the digit;

§
### D.

Extent of range of flexion or extension at the metacarpophalangeal joint for the thumb:

§
#### (1)

extension is greater than zero degrees and flexion is:

§
##### (c)

limited to less than zero degrees, that is, there is an extension contracture, six percent of the thumb;

§
#### (2)

extension is limited to between zero degrees and 30 degrees flexion, that is, there is a flexion contracture, and flexion is:

§
#### (3)

extension is limited to greater than 30 degrees flexion, that is, there is a flexion contracture, 11 percent of the thumb;

§
### E.

§
#### (2)

extension is limited to between zero degrees and nine degrees flexion, that is, there is a flexion contracture, and flexion is:

Extent of range of flexion or extension at the interphalangeal joint for the thumb:

§
#### (1)

extension is greater than zero degrees and flexion is:

§
##### (c)

limited to less than zero degrees, that is, there is an extension contracture, nine percent of the thumb;

§
#### (3)

extension is limited to between ten degrees and 40 degrees flexion, that is, there is a flexion contracture, and flexion is:

§
#### (4)

extension is limited to greater than 40 degrees flexion, that is, there is a flexion contracture, nine percent of the thumb;

§
### F.

Abduction of the thumb is the greatest possible distance from the flexor crease of the metacarpophalangeal joint of the fifth metacarpophalangeal joint to the palmar skin of the thumb tuft. The limit of passive abduction is:

§
### G.

Radial abduction of the thumb is the greatest possible distance from the radial border of the index finger to the ulnar border of the thumb. The limit of passive radial abduction is:

§
### H.

Opposition of the thumb is the smallest possible distance between the thumb and index fingertips. The limit of passive opposition is:

MS s 176.105

17 SR 3364; 35 SR 138

August 16, 2010

Official Publication of the State of Minnesota

Revisor of Statutes