Document ID: chunk:federal_register_of_legislation:F2023L00203:clause:1_10:p2
Version: federal_register_of_legislation:F2023L00203
Segment Type: clause
Provision Reference: sch 1 cl 10 (pt 2/2)
Character Range: 217473–219507

90°                                                                              4                           4                1          5                  5                0  90°
100°                                                                             4                           4                0                                                 100°
Flexion                                                                                                                                                                         Flexion

    Notes to Tables 9.8.1a, 9.8.1b, 9.8.1c and 9.8.1d
      1. Abbreviations:
IP = interphalangeal.
MP = metacarpo-phalangeal.
CMC = carpometacarpal.
PIP = Proximal interphalangeal.
DIP = Distal interphalangeal.
2.     Thumb adduction is the smallest possible distance from the flexor crease of the IP joint of the thumb to the distal palmar crease over the level of the MP joint of the little finger. The normal range of adduction of the thumb is from 8cm to 0cm.
3.     Thumb radial abduction is the largest angle of separation actively formed between the first and second metacarpals in the coronal plane. The normal angle of radial abduction is 50°. The smallest angle of thumb radial adduction is 15°.
4.     Opposition of the thumb is measured as the largest achievable distance between the flexor crease of the IP joint of the thumb to the distal palmar crease directly over the third MP joint. The normal range of opposition of the thumb is from 0cm to 8cm. In the case of employees with small hands, compare the loss of opposition with the normal range of opposition in the unaffected hand.
5.     Optimal positions of thumb and fingers:

Joint      Optimal position                         Joint           Optimal position
Thumb IP   20° of flexion               Finger DIP  20° of flexion
Thumb MP   20° of flexion               Finger PIP  40° of flexion
Thumb CMC  30°-35° of radial abduction  Finger MP   30° of flexion

    9.8.2   Sensory losses in the thumb and fingers