To all:
Recently I attended the Mulligan's level 1 SNAGS NAGS MWM course, which
talked about the importance of mobilisation in the treatment plane. I came
across an aricle in the journal of ergonomics regarding the often forgotten
3D orientation of the joints:
>Baeyens J-P, Van Roy P, Clarys JP. Related Articles
>Intra-articular kinematics of the normal glenohumeral joint in the late
>preparatory phase of throwing: Kaltenborn's rule revisited.
Ergonomics. 2000 Oct;43(10):1726-37.
"A new method to quantify intra-articular relationships between articular
surfaces of the glenohumeral joint during discrete poses representing the
late preparatory phase of throwing is presented. This method is based on 3D
bone reconstructions from medical imaging data processed into finite helical
axis parameters. With the shoulder moving in the anatomical planes from 90
degrees abduction and 90 degrees external rotation into the apprehension
test pose, the centre of the humeral head posteriorly translated on the
glenoid and rotated about a finite helical axis, which was positioned at the
joint contact. The data are contrasted with Kaltenborn's convex-concave rule
explaining intra-articular kinematics of the glenohumeral joint as a
ball-and-socket joint. The data show at all conditions that the glenohumeral
joint does not act as a ball-and-socket joint. Consequently, the
mobilization techniques used in manual therapy, which are based on this
convex concave rule, should be adapted."
So if this is right, then it would explain why may joints naturally should
fee stiff with anatomical plane glides (shoulder AP is the first that comes
to mind)... so if our main aim is purely to glide the joint, should we angle
our passive mobilisation techniques in the line of the treatment plane? Any
thoughts on this at all??
I hope this is better than talking about penis enlargements and making money
illegally :)
Henry***
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