Shoulder Kinematics and Scapular Movement
40 Questions
4 Views

Choose a study mode

Play Quiz
Study Flashcards
Spaced Repetition
Chat to lesson

Podcast

Play an AI-generated podcast conversation about this lesson

Questions and Answers

What occurs during external rotation of the glenohumeral joint?

  • The head glides anterior and rolls posterior
  • The head rolls anterior and glides posterior
  • The head rolls posterior and glides anterior (correct)
  • The head remains still

    • Which muscles act as dynamic stabilizers of the acromioclavicular joint?

  • Latissimus dorsi and teres major
  • Teres minor and infraspinatus
  • Subclavius and pectoralis major
  • Deltoid and upper trapezius (correct)

    • What is the net result of simultaneous glide and roll in the glenohumeral joint?

  • No effect on movement
  • Increased friction
  • Reduced range of motion
  • Increased range of motion (correct)

    • Which muscle is a proximal stabilizer during the first stage of global flexion?

    <p>Coracobrachialis</p> Signup and view all the answers

    What occurs during upward rotation of the scapula?

    <p>The scapula follows the path of the clavicle</p> Signup and view all the answers

    What is the total range of motion in shoulder abduction?

    <p>180 degrees</p> Signup and view all the answers

    What is the function of the conoid and trapezoid ligaments?

    <p>To stabilize the acromioclavicular joint</p> Signup and view all the answers

    What occurs during protraction of the scapula?

    <p>The scapula follows the path of the clavicle</p> Signup and view all the answers

    What is the primary function of the subclavius muscle?

    <p>To stabilize the sternoclavicular joint</p> Signup and view all the answers

    What occurs during downward rotation of the scapula?

    <p>The scapula follows the path of the clavicle</p> Signup and view all the answers

    What is the primary motor muscle involved in the first stage of glenohumeral joint movement (0-90 degrees)?

    <p>Deltoids</p> Signup and view all the answers

    Which of the following muscles is NOT involved in scapulothoracic joint movement?

    <p>Biceps brachii</p> Signup and view all the answers

    What is the range of degrees for the second stage of glenohumeral joint movement?

    <p>90-150 degrees</p> Signup and view all the answers

    Which muscle is responsible for upward rotation of the scapula during the second stage of glenohumeral joint movement?

    <p>Upper trapezius</p> Signup and view all the answers

    What is the range of degrees for global abduction?

    <p>45-55 degrees</p> Signup and view all the answers

    Which muscle is involved in both glenohumeral joint flexion and scapulothoracic joint flexion?

    <p>Serratus anterior</p> Signup and view all the answers

    What is the primary motor muscle involved in shoulder external rotation?

    <p>Infraspinatus and teres minor</p> Signup and view all the answers

    Which of the following muscles is NOT involved in shoulder internal rotation?

    <p>Rhomboids</p> Signup and view all the answers

    What is the range of degrees for the third stage of glenohumeral joint movement?

    <p>150-180 degrees</p> Signup and view all the answers

    Which muscle is involved in shoulder flexion?

    <p>Deltoids</p> Signup and view all the answers

    Which muscle is responsible for upward rotation of the scapula?

    <p>Serratus anterior</p> Signup and view all the answers

    What is the function of the Rotator Cuff muscles?

    <p>To regulate dynamic joint stability</p> Signup and view all the answers

    Which muscle is an agonist for extending the shoulder?

    <p>Latissimus dorsi</p> Signup and view all the answers

    Which muscles are responsible for scapular depression?

    <p>Pectoralis minor and subclavius</p> Signup and view all the answers

    What is the role of the rhomboids in scapular movement?

    <p>Retraction and downward rotation of the scapula</p> Signup and view all the answers

    Which muscle is a synergist for internal rotation of the shoulder?

    <p>Supraspinatus</p> Signup and view all the answers

    Which muscle is responsible for flexion of the shoulder?

    <p>Anterior deltoid</p> Signup and view all the answers

    What is the role of the middle trapezius in scapular movement?

    <p>Retraction of the scapula</p> Signup and view all the answers

    Which muscle is an external rotator of the shoulder?

    <p>Infraspinatus</p> Signup and view all the answers

    Which muscle is a stabilizer of the scapula during GH extension?

    <p>Rhomboids</p> Signup and view all the answers

    What type of joint is the Glenohumeral Joint?

    <p>Ball and socket joint</p> Signup and view all the answers

    What is the primary function of the Rotator Cuff?

    <p>Stabilization</p> Signup and view all the answers

    What type of movement is limited by the conoid and trapezoid ligaments?

    <p>Sliding movements</p> Signup and view all the answers

    What is the name of the space that allows for scapulothoracic joint movement?

    <p>Thoracoserratic space</p> Signup and view all the answers

    What happens when the supraspinatus muscle is not activated during abduction?

    <p>Subacromial impingement occurs</p> Signup and view all the answers

    What type of joint is the Scapulothoracic joint considered?

    <p>Anatomical false joint</p> Signup and view all the answers

    What is the primary movement of the Glenohumeral joint during flexion?

    <p>Anterior translation</p> Signup and view all the answers

    What is the importance of the Supraspinatus action during abduction?

    <p>To stabilize the Glenohumeral joint</p> Signup and view all the answers

    What is the movement allowed by the Scapulothoracic joint?

    <p>All of the above</p> Signup and view all the answers

    What is the advantage of abduction in the scapular plane?

    <p>No structural compression</p> Signup and view all the answers

    Study Notes

    Internal and External Rotation

    • ER: The head rolls posterior and glides anterior
    • IR in the opposite way
    • Simultaneous glide and roll allows head to roll over a smaller surface

    AC and SCC Kinematics

    • Only passive movements
    • All scapular movement = clavicular movement
    • Allow for wider ROM added to glenohumeral motion
    • Example: shoulder abduction (total of 180 degrees)
      • -60 degrees lateral of the scapula: 20 degrees Acromioclavicular + 40 degrees Sternoclavicular

    AC Joint Stabilizers

    • Static:
      • Joint capsule: reinforced by capsular ligaments
      • Ligaments: Conoid and Trapezoid ligaments
      • Articular disc
    • Dynamic:
      • Deltoid and upper trapezius muscles

    SCC Joint Stabilizers

    • Static:
      • Fibrous capsule
      • Ligaments: anterior and posterior sternoclavicular, costoclavicular on each side
      • Articular disc
    • Dynamic:
      • Subclavius muscle

    Scapulothoracic Joint

    • Larger shoulder amplitude thanks to ST
    • AC and SCC movement all for ST
    • Elevation and depression
      • SCC and AC
      • Scapula follows path of clavicle
    • Protraction and retraction
      • Horizontal plane rotations of SCC and AC
      • Scapula follows clavicle path

    Upward and Downward Rotation

    • Upward rotation
      • Arm raise
      • Sum of SCC elevation and AC upward rotation
    • Downward rotation
      • Arms come back
      • Sum of SCC depression and downward rotation AC

    KINETICS

    Muscular Actions

    • Proximal stabilizers
    • Distal mobilizers

    Global Flexion

    • First Stage. 0-30/60.GH
      • Motor muscles: anterior deltoids, Coracobrachialis, Clavicular Pectoralis major
      • Movement limits: Coracohumeral ligament strain
    • Second Stage. 30/60-120.STj
      • Upward rotation of the scapula
      • Muscles of the Scapulothoracic Joint
        • Elevators: Upper Trapezius, Levator scapulae, Rhomboids
        • Depressors: Lower Trapezius, Latissimus dorsi, Pectoralis Minor, Subclavius
        • Protractors: Serratus Major
        • Retractors: Middle Trapezius, Rhomboids and lower trapezius

    Scapulothoracic Joint Muscles

    • Upward rotation of the scapula: Serratus anterior, Upper Trapezius
    • Retraction and downward rotation: Rhomboids Stabilizers scapula in ADD and GH extension

    Muscles that move in ADD and EXTEND the shoulder

    • Major isometric moment of the shoulder
      • Agonists: Latissimus and Pectoralis major
      • Synergistic: Infraspiantus, teres minor and major

    Rotator Cuff muscles

    • FUNCTIONS:
      1. Dynamic joint stability regulators
      2. Arthrokinematics controllers

    Muscles that internally and externally rotate the shoulder

    • Internal rotators: Subscapularis, anterior deltoid, Pectoralis major, Latissimus dorsi, and teres major
    • External rotators: Infraspiantus, teres minor, and the posterior portion of the posterior deltoid

    Global Abduction

    • First Stage. 0-90 degrees
      • Motor muscles: Deltoids, especially the middle fasciculus and Supraspinatus
    • Second Stage. 90-150
      • Upward rotation of the scapula orienting glenoids
      • Motor muscles: Serratus and Upper trapezius
    • Third Stage. 150-180
      • Contralateral tilt of the spine due to contraction of the spinal muscles of the opposite side

    Global Adduction

    • 30-45
      • When arm is in ABD —> the ADD is made by eccentric contraction of ABD muscles
      • Motor muscles:
        • GHj flex: Pectoralis Major and Anterior deltoid
        • GHj extension: Teres major and minor, Latissimus dorsi
        • STj flex: Serratus anterior
        • STj extension: Rhomboids

    External Rotation

    • 60-70
      • Motor muscles: Infraspinatus and teres minor
      • The movement of scapular adduction is added by the action of the rhomboids and the middle portion of the Trapezius

    Internal Rotation

    • 75-85
      • Motor muscles: Teres major, Latissimus dorsi, Subscapularis, Pectoralis Major
      • The protraciton movement of the scapula is added by Serratus Major and Pectoralis Minor action

    Studying That Suits You

    Use AI to generate personalized quizzes and flashcards to suit your learning preferences.

    Quiz Team

    Related Documents

    Shoulder Kinesiology PDF

    Description

    Understanding internal and external rotation, simultaneous glide and roll, and kinematics of AC and SCC joints for wider range of motion in shoulder abduction.

    More Like This

    Use Quizgecko on...
    Browser
    Open
    Browser
    Browser