Sublime

Osar (2012) mentions that nutation is the anterior inferior motion of the sacral base, while counternutation is the posterior superior motion of the sacral base. Nutation is necessary for the locking of the SIJ during unilateral stance. The inability to nutate the sacrum is a leading cause of unilateral stance instability and one of the causes of t

What this comes down to in general terms for our teaching is that we cannot usefully separate structure from function because they are not separate. You move and create form as you form shapes by moving.

Rolling and sliding often occur together in a joint movement, again to maximize surface area contact. This happens, for example, at the knees and at the shoulders. As shown in the shoulder example in figure 1.52, when the humerus is abducted to the side, it rolls in the shoulder socket, but it also slides down a bit so that the surfaces stay in con

Ball-and-socket joints (also called spheroidal joints), such as the hip and shoulder. Here one bone