The Shoulder Complex

Consists of TWO SHALLOW SADDLE-SHAPED surfaces but is often considered a PLANE SYNOVIAL JOINT
Click the card to flip 👆
1 / 34
Terms in this set (34)
Consists of TWO SHALLOW SADDLE-SHAPED surfaces but is often considered a PLANE SYNOVIAL JOINT
Sternoclavicular Articulation
Acromioclavicular Joint OBJECTIVES:
INCREASING upper extremity motion

Positioning the glenoid BENEATH the humeral head

Helping MAXIMIZE scapula contact with the thorax
Where is the STERNOCLAVICULAR ARTICULATION Located?
Anteriorinferiorly
PRIMARY FUNCTION of the Acromioclavicular Joint
To allow the SCAPULA to ROTATE in THREE dimensions during ARM MOVEMENT
The STERNOCLAVICULAR JOINT is surrounded by a fairly strong fibrous capsule BUT depends on THREE ligament complexes for majority support:
Anterior & Posterior Sternoclavicular ligaments

Bilaminar Costoclavicular ligament

Interclavicular ligament
What OCCURS when the STERNOCLAVICULAR DISC & MEDIAL articular surface of the CLAVICLE roll and glide TOGETHER on the manubrial facet with the LOWER attachment of the fibrocartilage disc serving as the PIVOT POINT?
Clavicular Protraction and Retraction
Attachment of the LOWER PORTION of the FIBROCARTILAGE DISC?
Attached to the MANUBRIUM and the FIRST COSTAL CARTILAGE as well as the ANTERIOR & POSTERIOR portions of the fibrous STERNOCLAVICULAR CAPSULE
Attachment of the UPPER PORTION of the FIBROCARTILAGE DISC?
Attached to the POSTERIOR-SUPERIOR CLAVICLE
Which joint contains FIBROCARTILAGE DISCS?
Sternoclavicular Joint
What is the function of Fibrocartilage Discs?
Increases congruency between the articulating surfaces and dissipates JOINT LOADS
Exists when a moving segment or set of segments is NOT limited very much by PASSIVE forces such as: - articular surface configuration - capsule - ligaments BUT INSTEAD relies heavily on ACTIVE forces or dynamic muscular controlDynamic StabilizationName the OSSEOUS SEGMENTS of the shoulder complexClavicle Scapula HumerusThe THREE Osseous Segments are joined by THREE INTERDEPENDENT LINKAGES:Sternoclavicular Joint Acromioclavicular Joint Glenohumeral JointThe JOINTS that compose the SHOULDER COMPLEX can, in combination with TRUNK MOTION, contribute as much as _________ degrees of ELEVATION180Refers to the combination of SCAPULAR, CLAVICULAR, & HUMERAL motion that occurs when the arms are RAISED either forward or to the side including: - Sagittal Plane Flexion - Frontal Plane AbductionElevationWhich JOINT is the ONLY structural attachment between AXIAL skeleton and the SHOULDER upper extremity?Sternoclavicular JointThe STERNOCLAVICULAR JOINT is classified as a ____________ jointSynovial JointDEGREES OF FREEDOM - Sternoclavicular Joint3 rotary & 3 translatoryThe contradictory requirements on the SHOULDER COMPLEX for both MOBILITY & STABILITY are met through ACTIVE forces known as:Dynamic StabilizationWhat OCCURS when the MEDIAL articular surface of the CLAVICLE rolls and slides on the relatively STATIONARY disc with the UPPER attachment serving as the PIVOT POINTClavicular Elevation and DepressionThe SUPERIOR & INFERIOR portions of the MEDIAL clavicle DO NOT contact the sternum but serve as attachments for the accessory joint structures:Sternoclavicular Joint Disc The Joint Capsule Interclavicular LigamentAt REST the Sternoclavicular Joint Space is:Wedged-shaped & opened superiorlyMovements of the CLAVICLE in relation to the MANUBRIUM result in:Contact area changes between the: - Clavicle - Sternoclavicular Joint Disc - Costal CartilageWhich joint attaches the scapula to the LATERAL clavicle?Acromioclavicular JointThe capsule of acromioclavicular joint is weak and maintains integrity of the joint through the reinforcement of the _______________ & _____________ acromioclavicular ligamentsSuperior & InferiorThe fibers of the SUPERIOR acromioclavicular ligament are reinforced by APONEUROTIC FIBERS of the _________________ & __________________ muscles, making the SUPERIOR ligament stronger than the INFERIOR capsuletrapezius & deltoidWhich joint is not a "true anatomic joint" because it is NOT a union of BONY SEGMENTS by FIBROUS, CARTILAGE, or SYNOVIAL tissues?Scapulothoracic JointWhich joint is formed by the articulation of the ANTERIOR surface of the SCAPULA with the THORAXScapulothoracic JointAny movement of the SCAPULA on the THORAX must result in movement where?Movement at the Acromioclavicular Joint, the Sternoclavicular Joint, or bothWhich joint is a ball-in-socket synovial joint?Glenohumeral JointGlenohumeral Joint - The REDUCED STABILITY results in:Increased susceptibility to degenerative changes, instability, and derangementWhat serves as the PROXIMAL articular surface for the glenohumeral joint?Glenoid Fossa of the ScapulaWhat serves as the DISTAL articular surface of the glenohumeral joint?Humeral HeadThe total available articular surface of the glenoid fossa is ENHANCED by the:Glenoid Labrum