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Arthroplasty—Simple resection arthroplasty is given 40% impairment of the joint value due to loss of function; implant arthroplasty is given 50% impairment of the joint value due to loss of function. Table 20 provides impairment ratings for the upper extremity for arthroplasty of specific joints, based on these values.

Table 20
IMPAIRMENTS OF UPPER EXTREMITY FOLLOWING ARTHROPLASTY OF SPECIFIC BONES OR JOINTS
% Impairment of Upper Extremity
Level of
Arthroplasty 		Resection
Arthroplasty 		Implant
Arthroplasty
Shoulder 24 30
Total elbow 28 35
Radial head (isolated) 8 10
Total wrist 24 30
Ulnar head (isolated) 8 10
Proximal carpal row 12 15
Carpal bones 12 15
Thumb**
Carpometarcarpal 11 13
Metacarpophalangeal 1 2
Interphalangeal 2 3
Index of middle fingers***
Metacarpophalangeal 7 9
Proximal interphalangeal 6 7
Distal interphalangeal 3 4
Ring or little fingers***
Metacarpophalangeal 3 4
Proximal Interphalangeal 3 3
Distal lnterphalangeal 2 2
* If more than one level is involved, combine from distal to proximal using the Combined Values Chart.
** if more than one thumb joint is involved, add impairments.
If more than one joint is involved in the same finger, combine impairments using the Combined Values Chart.
If multiple digitis are involved, add the impairment values for the digits.

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