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Movement Science > Shoulder > Flashcards

Shoulder Flashcards

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1
Q

Shoulder Complex Components

A

-Sternoclavicular joint
-Acromioclavicular joint
-Glenohumerual joint (2/3rds of movement)
-Scapulothoracic joint (1/3rds of movement)

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2
Q

Normal ROM

A

0-180

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3
Q

Sternoclavicular Joint Structure

A

-only attachment between axial and shoulder
-degeneration uncommon
-elevation/depression, protraction/retraction, anterior/posterior rotation

2 plane synovial joints
-Superior: medial clav and disc
-Inferior: medical clav and manubrium

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4
Q

Shoulder Elevation Joint Movements

A

-48 degrees

SC: rolls superiorly; slides inferiorly on sternum
AC: moves upward
ST: elevation
GH: slides inferiorly and rolls superiorly (during arm flexion)

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5
Q

Sternoclavicular Joint Capsule and Ligaments

A

Anterior SCL: limit A/P translation

Posterior SCL: main limiter of A/P translation

Costoclavicular Lig: limit elevation of lat clav and SCM

Interclavicular Lig: resist depression of clav; superior glide on manubrium; protects brachial plexus

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6
Q

Shoulder Despression Joint Movements

A

-15 degrees

SC: rolls inferiorly; slides superiorly on sternum
AC: moves downward
ST: depression

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7
Q

Shoulder Protraction Joint Movements

A

-15-20 degrees

SC: rolls and slides anteriorly on sternum
AC: rolls and slides anteriorly
ST: protraction/abduction

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8
Q

Shoulder Retraction Joint Movements

A

-30 degrees

SC: rolls and slides posteriorly on sternum
AC: moves posteriorly
ST: retraction/adduction

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9
Q

Shoulder Posterior Rotation Joint Movements

A

-50 degrees

SC: inferior faces anteriorly
AC: n/a

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10
Q

Shoulder Anterior rotation Joint Movements

A

-10 degrees

SC: returns to neutral
AC: n/a
ST: anterior tilt

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11
Q

Acromioclavicular Joint Structure

A

-scapula to clavicle
-plane joint
-positions glenoid beneath humerus
-not stable
-maximizes scap contact with thorax

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12
Q

Acromioclavicular Capsule and Ligaments

A

-weak capsule; reinforced by delts and traps

Superior ACL: reisist opposing forces

Inferior ACL: not as strong

Coracoclavicular Lig: unites clavicle and scapula; couple pos clavical rotation during scapular UR
-Conoid: medial; inferior forces
-Trapezoid: lateral; posterior translation

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13
Q

Scapulothoaracic Joint Structure

A

-not a true joint
-depends on integrtiy SC and AC

Rest:
-2 inches from midline
-IR 35-45
-anterior tilt 10-15
-UR 5-10

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14
Q

Glenohumeral Joint Structure

A

-ball in socket
-3 rotary and 3 translatory
-humeral head faces medially, superiorly, posteriorly
-angle of inclination 130-150
-angle of torsion 30 post

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15
Q

Glenohumeral Joint Capsule and Ligaments

A

Capsule:
-tightens with abd and ER
-2.5cm of distraction
-vulnurable to ant dislocations

Superior GH Lig:
-forms RC
-reisist ant and inf translations at 0 abd

Middle GH Lig: prevents any movement from 0-60 abd

Inferior GH Lig Complex:
-Anterior: ant/inf translation
-Posterior: post/inf translation
-Axillary Pounch: prevents inf translation

Coracohumeral Lig: 2 bands form tunnel for LHB
-1st band: coracoid to supraspinatus tendon
-2nd band: coracoid to subscap tendon

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16
Q

GH Movements and ROM

A

Flexion: 120
Extension: 50
IR and ER: depends on arm elevation
Ab and Adduction: 90-120 (limited by greater tubercle)

17
Q

GH Static Stabilization

A

Counterracted by:
-capsule
-glenoid
-tendons

*supraspinatus contracts to prevent inferior subluxation

18
Q

GH Dynamic Stabilization

A

Deltoid: prime mover of abd and flexion
-most force on humerus from parallel at rest
-help from RC

Rotator Cuff:
-perpendicular force component for humeral rotation
-balances deltoid

*infra and teres minor help clear greater tub with ER

LHBB:
-runs between greater and lesser tubercle
-tighten labrum; reinforce GH

19
Q

Scapulohumeral Rhythm

A
  1. Abduction 30deg or flexion 60deg (GH)
  2. GH and ST 1:1 30-120; clavicular elevation
  3. GH and ST 3:2 last 60
20
Q

Muscle Control: Elevation

A

Deltoid: Ant primary for flexion; ant and mid for abduction; joint compression

Supraspinatus: first 60 degrees of abduction MA greater than Delt

Other RC: greater in flexion than abduction

Trap and SA: UR

Rhom, LS: elevate and downwardly rotate, stabilize

21
Q

Muscle Control: Depression

A

Lats: adduction, extension, IR, scap depression

Pecs: depress GH

Teres Maj and Rhom: adduction and depression of humerus

Levator: downward rotation

Movement Science (13 decks)

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