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Musculoskeletal—Upper Extremities
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THUMB
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Table 1
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IMPAIRMENT DUE TO
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ABNORMAL MOTION AND ANKYLOSIS OF THE
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INTERPHALANGEAL JOINT OF THE THUMB
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Abnormal Motion
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Average range of FLEXION-EXTENSION is 80 degrees
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Value to total range of joint motion is 100%
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Flexion from neutral position ( 0°) to:
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LOST
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RETAINED
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% Impairment of Thumb
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0°
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80
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0
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45
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10°
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70
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10
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39
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20°
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60
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20
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34
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30°
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50
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30
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28
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40°
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40
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40
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23
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50°
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30
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50
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17
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60°
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20
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60
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11
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70°
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10
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70
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6
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80°
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0
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80
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0
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Ankylosis
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Joint ankylosed at:
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0°(neutral position)
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45
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10°
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43
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20°
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40
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30°
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38
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40°
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35
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50°
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45
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60°
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55
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70°
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65
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80° (full flexion)
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75
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*position of function
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