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what kind of joint is the AC? anatomically, mechanically, functionally?
- anatomically: simple (complex when disk is present - it may or may not be present)
- mechanically: compound plane gliding joint
- functionally: ball and socket bc of lax capsule & disk (when present)
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what's the contour of acromial surface of the AC jt and which way does it face?
- slightly convex
- faces ant, med, sup
- (this is up for debate)
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what's the contour of clavicular surface of the AC jt and which way does it face?
- flat, slightly convex
- post, lat, inf
- (happily the opp of the acromion's angles, tho they're both convex)
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tell me about the articular disc in the AC joint?
- present in 1/3 of pop
- occcupies only the sup part of the jt
- only partially separates the articular surfaces
- rarely divides joint completely
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ligs all around the GH can impede the AC, esp the ___
coracoacromial lig - it pulls down while muscles pull clavicle
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if hum head is riding high + banging north -->
- distraction at AC, no good
- supraspinatus gets pinched
- (I'm copying from my notes, not sure what it means now)
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in AC joint what'll give pain before anything else?
bursa
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what's the ligament with two parts that are separated by fat or bursa?
coracoclavicular lig - conid and trapezoid parts
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at AC jt, what's the motion around the sagital axis?
abd add (up/down rot) of lower end of scap around the chest wall - 20-30 degrees
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at AC jt, what's the motion around the vertical axis?
winging of scap 30-50 degrees "(fine tuning)"
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at AC jt, what's the motion around the long axis thru the clavicle?
- tilting of inf angle away from chest wall as in protraction
- 30 degrees
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resting pos of AC jt
arm at side (same as SC jt)
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close packed pos of AC jt
upward rot of scap w arm abd to narrow the thoracic inlet (as does horiz add of the arm)
per magee & anna: 90 degrees abd
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capsular pattern of AC jt
pain w elevating arm or horiz add, limited full extension
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PA glide of AC jt helps what?
retraction
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AP glide of AC jt helps what?
protraction
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pain on abd or scaption could be due to what?
- supraspinatus impingement
- bursitis
- labral issue (though if that it'll click and clunk)
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pain on extreme foward elevation at AC jt could be...?
- impingement of supraspinatus
- biceps
- AC jt
- a scap issue
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painful arc sign of supraspinatus?
- pain btwn 60-120 degrees abd
- (impingement or tendonitis)
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precise direction of PA glide at AC jt
- anterolat
- for post it looks like it's simply post
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