A patient with osteoarthritis demonstrates a type III thumb deformity and reports pain with pinching activities
The therapist notices that there appears to be subluxation of the metacarpal during pinching, as noted by a bony enlargement at the base of the thumb. The splint should gently position the thumb opposite of the passively corrected deformity. With a type III deformity, the splint should gently place the thumb in which of the following?
A. CMC abduction, metacarpophalangeal (MP) joint slight flexion, and provide CMC stability to prevent subluxation
B. CMC joint adduction, MP extension, and provide CMC stability to prevent met-acarpal subluxation
C. CMC abduction, interphalangeal (IP) flexion, and provide CMC stability to pre-vent metacarpal subluxation.
D. CMC flexion, IP extension, and provide CMC stability to prevent metacarpal subluxation
ANS: A
A type III deformity involves CMC joint subluxation, adduction, and flexion; MP joint hyper-extension; and IP joint flexion. Only (A) provides a statement that positions the joints opposite of that deformity.
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