Question

question 48 (mandatory) (2 points) listen what’s the roll and slide mechanism occurring at the sc joint during scapular protraction? a) posterior roll, posterior glide b) anterior roll, anterior glide c) anterior roll, posterior glide d) posterior roll, anterior glide

Explanation:

To determine the roll - slide mechanism at the sternoclavicular (SC) joint during scapular protraction, we recall the biomechanics of the SC joint. During scapular protraction, the clavicle at the SC joint undergoes an anterior roll. And for the glide (slide) component, it is a posterior glide. This is based on the joint mechanics where roll and slide directions are related to the convex - concave rule and the movement of the scapula. Option a has posterior roll and glide which is incorrect. Option b has anterior glide which is wrong. Option d has posterior roll and anterior glide which is incorrect. Only option c (Anterior roll, posterior glide) matches the correct biomechanical mechanism.

Answer:

c) Anterior roll, posterior glide