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Table 3
Impairment Due To Abnormal Motion And Ankylosis Of The Carpometacarpal Joint Of The Thumb
Abnormal Motion
Average Range Of Flexion-extension Is 45 Degrees
Degrees Of Joint motion
Flexion from neutral
Position (0°) to: 		  Lost Retained % Impairment Of Thumb
0°   15 0 15
10°   5 10 5
15°   0 15 0
 
Extension From Neutral
Position (0°) to: 		       
0°   30 0 15
10°   20 10 10
20°   10 20 5
30°   0 30 0
 
Ankylosis
Joint Ankylosed At:  
  0° (neutral position) 30
  10° 55
    15°(full Extension) 80
         
Joint Ankylosed At:        
    0° (neutral Position) 30
    10°   47
    20°   63
    30° (full Extension) 80

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