The external rotation that occurs at the glenohumeral joint after 80 ° to 90 ° of abduction produces a(n) ____________________ roll and a(n) ____________________ glide of the humeral head on the glenoid fossa
a. posterior, posterior
b. anterior, anterior
c. anterior, posterior
d. posterior, anterior
ANS: D
General rules of arthrokinematics suggest that when a convex surface moves on a concave surface, the role and glide occur in opposite directions. This is true and can easily be seen with movement of the large, convex humeral head on the rather shallow concave glenoid fossa. Without this arthrokinematic gliding, motion at the GH joint would be severely impaired.
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