An OT practitioner has measured a client's passive thumb metacarpophalangeal (MP) flexion. The recorded ROM is -30 to 0 to 35. What does this tell the therapist?
A. That the joint has normal hyperextension and normal flexion
B. That the joint has limited hyperextension and limited flexion
C. That the joint has abnormal hyperextension and limited flexion
D. That the joint has abnormal hyperextension and normal flexion
ANS: C
Using the 180-degree system of recording, the starting position of normal joint motion is 0 de-gree. -30 to 0 to 35 indicates the degree of hyperextension below the 0-degree starting position. -30 to 0 to 35 indicates the ending degree of MP flexion. Average normal thumb MP ROM is 0 to 50, so the client has both abnormal hyperextension and limited flexion.
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