measureAnteroPosteriorImbalance.m
a269cbf6b3ecmaster

measureAnteroPosteriorImbalance.m
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			function measureAnteroPosteriorImbalance(obj)
			scapulaCS = obj.shoulder.scapula.coordSys;

			forceResultant = Vector(scapulaCS.origin, scapulaCS.origin)...
			+ obj.SC.forceVector...
			+ obj.SS.forceVector...
			+ obj.IS.forceVector...
			+ obj.TM.forceVector;

			% Take infero-superior orthogonal component <=> project on scapular axial plane
			inferoSuperior = Vector(scapulaCS.origin, scapulaCS.origin + scapulaCS.IS);
			imbalanceVector = inferoSuperior.orthogonalComplementTo(forceResultant);

			lateroMedial = Vector(scapulaCS.origin, scapulaCS.origin - scapulaCS.ML);
			anteroPosterior = Vector(scapulaCS.origin, scapulaCS.origin - scapulaCS.PA);

			% posterior imbalance is positive
			obj.anteroPosteriorImbalance = ...
			sign(dot(imbalanceVector, anteroPosterior)) *...
			rad2deg(lateroMedial.angle(imbalanceVector));
			end