GH Joint
What is the capsular pattern of the GH joint
What type of joint is the scapulothoracic joint?
trick question! It's a pseudo joint
What type of joint is the AC joint?
Plane Synovial
T/F: In protraction/retraction of SC joint, the clavicle rolls and slides on the disc and manubrium
False: the clavicle and disc roll and slide on the manubrium
What is the loose packed position of the GH joint?
40-55º ABD, 30º horizontal ADD, neutral rotation
What are the component motions of protraction and retraction?
Protraction: ABD, IR
Retraction: ADD, ER
Name the 3 'types/shapes' of the Acromion
Flat, curved, hooked
Describe the osteokinematics of the SC joint during elevation/depression
Convex clavicle
Concave Sternum and 1st rib
What is the angle of inclination of the GH joint? Angle of torsion?
Inclination = 130-150º
Torsion = 30º retroversion
What are the most important components of scapular elevation?
Upward rotation, ER, posterior tilt
What movements are most painful in someone with AC joint issues?
horizontal add, resisted horizontal abd, elevation
Name all of the rotary and translatory degrees of freedom at the SC joint.
Rotary: elevation/depression, protraction/retraction, ant/post rotation
Explain what occurs at the GH joint during abduction
Inferior glide
initial: GH ABD ~30º
Ratio: 2:1 until 160º
What clavicular movement occurs with scapular and ACJ upward rotation
Posterior rotation
What is the orientation of the scapula at rest?
Medial border: 2-3in from spine
IR = 35-45º
Ant tilt = 10-15º
upward rotation = 5-10º