Kines Shoulder Flashcards
The Shoulder
At a Glance
Mobility at expense of stability 17-20 muscles 5-7 articulations act as a mechanism Effective control of hand in space Aids in lifting and pushing Considered a weight bearing joint
Predisposed characteristics of shoulder
High mobility
Low stability
“Freely hanging” control of arm in space
What are the steps in successful treatment of the shoulder complex?
Anatomical knowledge Biomechanics knowledge Systemic clinical exam Accurate MS diagnosis & classification Effective intervention Outcome assessment
Outcome Assessment
What is most important to pt? Return to proper function Increase strength Decrease pain *No guarantees, just probability
Clinical Approach in PT
Anatomical imperatives Pathomechanics Clinical decision making in exam Measurement scales and functional measures EBP issues (evidence based practice) Treatments Therapeutic exercises Post op surgical management Case examples
Thoracic outlet syndrome
Poor posture, rounded shoulders
Shoulder as a mechanism
Rigid bodies connected by joint in order to accomplish a desired force and/or motion.
Multi-Joint movement
Involves nerves, ligaments, muscles, joints
Glenohumeral motions
(All in relation to Global vs. Remote vectors) Backward extension Abduction Horizontal flexion Horizontal extension Foward flexion External rotation Internal rotation
Scapular motions
Elevation Depression Adduction Abduction Upward rotation Downward rotation
Benefits of labrum in glenoid fossa
Creates deeper glenoid
Also provides some suction
Gives more surface area to improve stability
Wedge shape
Changing radius of curvature
Increases ligamentous stretch with glenohumeral abduction
There are points where ligaments are tight and other points where they are loose.
Role of ligaments can never overtake muscles
Why joint symmetry?
Accepts forces
Absorbs shock
Efficiency of articular space - gliding
Enhance lubrication & room for aberrations
Torques at shoulder
Trying to pull up
Gravity at shoulder
Trying to pull down
Arthokinematics
Movement of joint surfaces
Arthokinematics of shoulder
Rotation
Rolling
Translation
Rotation
Arthokinematics
Moving contact point on moving surface
Rolling
Arthokinematics
Both contact points move equally
Translation
Arthokinematics
Contact point moves on stationary surface
Convex-Concave Rule
When a concave member is moving on a fixed convex, accessory motion = in same direction as physiological
When convex member is moving on a fixed concave, accessory motion = in opposition direction as physiological
Examples of Convex-Concave Rule
Flexion of knee
Posterior glide
(mobilize down/posterior)
Extension of knee
Anterior glide
(mobilize up/anterior)
Angles of shoulder joint
Head to shaft 135*
Retroversion of head 30* posteriorly
Subacromial space of shoulder
Gives 9-12mm of space
Significant
Key to movement
Structure dictates function which dictates mobility
First goal of Rotator cuff muscles
Compress the joint
Then movement of muscles
Bursae
Function & Locations in Shoulder Joint
Prevent friction
Locations
Between infraspinatus and capsule
Superior surface of acromiom
Between coracoid and capsule
Under coracobrachialis
Between teres major and long head of triceps
In front of and behind tendon a latissimus
Circle of stability
Supraspinatus (superior) SGHL (anterior) Subscapularis (anterior) MGHL (inferior) IGHL (inferior) Teres minor (posterior) Infraspinatus (posterior)
Types of Labral Tears
Roman numeral I-IV
Type I - minimal
Type IV - severe
Proactive type tests
Give themes information in the clinic
Ligamentous support via outgrowths of capsule
Coracoclavicular ligaments
Coroacromial ligament
Coracoclavicular ligament
Secondary restraint for humeral head Prevents upward dislocation of head Subacromial space (9-10mm ideal)
Glenohumeral ligaments
Superior, middle, and inferior GH lig.
Abduction
External rotation
Internal rotation
Glenohumeral ligaments
Superior, middle, and inferior GH lig.
Abduction (at 45* all lig. are lax)
External rotation
Internal rotation
Ligament function
Do not contract, just lose or gain tension!