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Muscle Groups of the Shoulder Background Scapulohumeral Timing

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Muscle Groups of the Shoulder Background Scapulohumeral Timing Movement System Impairment Syndromes of the Muscle Groups of the Shoulder Scapula & Humerus Axioscapular Muscles Developed by: – Must move the scapula correctly in order for the humerus to move correctly on the Shirley A. Sahrmann, PhD, PT glenoid and Associates Scapulohumeral Muscles – Control the glenohumeral joint but attach to scapula Washington University School of Medicine Axiohumeral Muscles Program in Physical Therapy – Bypass the scapula (hamstrings of UE) St. Louis, MO. Background Scapular and Humeral Diagnoses Based on the assumption that subtle Diagnosis assigned based on deviations in the precision of shoulder Alignment and movement impairments movement are the cause of the tissue noted throughout exam injury The movement impairment that, when We developed a set of movement- corrected, best alleviates the symptoms related diagnoses for shoulder determines the diagnosis problems and a standard examination Both a scapular & humeral diagnosis for assessing the patient’s preferred can be assigned, if appropriate alignment and movements. Scapular MSI Syndromes Scapulohumeral Timing Scapular internal rotation (AC joint) The critical factor with anterior tilt (AC joint) usually associated with insufficient UR (SC and AC joint) with impaired with abduction (SC joint protraction) – alignment at initiation, Scapular depression (SC depression) – terminal position, Scapular external rotation/adduction and (SC retraction; AC ER) – return to starting Scapular Winging (pathological) (AC joint) position Scapular elevation (SC elevation) Copyright Program in Physical Therapy Washington University School of Medicine - St. Louis 1 Definition of Scapular Definitions of Scapular Movements Movements Internal rotation: – rotation of the scapula (about a vertical axis at the acromioclavicular joint) » lateral border of the scapula moves Winging: anteromedially » vertebral border of the scapula moves – abnormal movement posterolaterally of the scapula » costal surface of the scapula faces more toward the midline of the body – about a vertical axis at Muscles that Internally rotate the the AC joint in which scapula – the vertebral border – Lateral rotators of glenohumeral joint moves in a posterior » Posterior deltoid and lateral direction » Infraspinatus away from the ribcage » Teres minor – (Hall, CM, Brody LT.) – Teres major Ludewig PM et al. 2009 External rotation: – Serratus, middle trap, rhomboids 8 Scapulothoracic Motion Normal Scapular Motion Scapula upwardly rotates and posteriorly tilts THE BIG THREE during arm elevation Upward rotation: – Ludewig PM et. al., JOSPT 1996 – primarily from the SC joint via posterior axial rotation of the – Lukasiewicz AC et. al., JOSPT 1999 clavicle on the sternum – McClure PW et. al., J Shoulder Elbow Surg 2001 – Secondarily from the AC joint – Minimal from elevation at the SC joint Scapula externally rotates during arm elevation Posterior tilt: especially at the end ranges. Ludewig PM 2009 – Primarily from the AC joint – Scapula internally rotates until after ~125° and then External rotation: starts to externally rotate Braman JP 2009 – SC joint (clavicular retraction) – By the end of arm elevation the scapula ER so it is – AC joint 10-20 degrees anterior to the frontal plane. Ludewig PM 2009 Ludewig P 2009 Normal Scapulothoracic Normal Scapulothoracic Motion Motion Arm lowering Arm lowering Scapula had greater posterior tilting (2°) During functional reach task there was relatively during arm lowering compared to arm raising less scapular movement compared to GH Ludewig PM 2009 movement during arm lowering compared to – So…you shouldn’t see increased anterior tilting during arm lowering during arm elevation. During functional reaching task the pattern of – Arm elevation: .43° scapular : 1° GH scapular movement during raising was – Arm lowering: .37° scapular: 1° GH mirrored during lowering regarding: Braman JP 2009 – Scapular internal/external rotation • Common impairment seen is ’d scapular movement during arm – Scapular tilting Braman JP 2009 lowering Copyright Program in Physical Therapy Washington University School of Medicine - St. Louis 2 Clinical Assessment: Criteria for Clinical Assessment: Criteria Normal Scapular Motion for Normal Scapular Motion Scapula should elevate but only slightly (6- By the end range of arm elevation: 10°) Ludewig PM 2009 – Acromion should be aligned with C6-7 – The vertebral border of the scapula should reach 55- 60 (+ or - 5) . Vertebral border of scapula should remain – Normal scapular abduction is 3” from the vertebral in contact with thorax spine to the root of the spine of the scapula. – Scapula should posteriorly tilt 10 (Ludewig PM 2009) – Scapula should externally rotate so it is 10-20 anterior Normal GH:ST rhythm: to the frontal plane (Ludewig PM 2009) – 2.1:1for abduction; 2.4:1 for flexion; 2.2:1 for scapular plane abduction Ludewig PM 2009 Normal Resting Standing Torque capabilities of Trapezius Alignment (Fey AJ, …..Ludewig PM JOSPT Jan 2007 Abstract) 19° SC joint clavicular retraction Used 3-D motion analysis and 6° SC clavicular elevation computer modeling of muscle moment arms – Findings of Primary Torque Capability: 41° scapular internal rotation » Upper trap = clavicular elevation 5° scapular upward rotation » Middle trap = scapular external rotation 13.5° scapular anterior tilt » Lower trap = scapular external rotation and upward rotation » Serratus anterior = upward rotation, 12 subjects; mean age 29.3 posterior tilt and external rotation Ludewig PM 2009 Scapular Internal Rotation – Key Concept insufficient Upward Rotation For Most Effective Treatment: Identify the Principal Movement Impairment (PMI) that is consistently associated with the patient’s symptoms throughout the examination (Diagnosis or Syndrome) Identify the impairments that contribute to the Principal Movement Impairment: – Muscle: (atrophy, strain, length-associated weakness, increased or decreased stiffness, changes in length) – Muscle recruitment: (timing, increased, decreased) – Biomechanical: (alterations in forces on the joints, bones, structural variations) Focus on modification of the Principal Movement Impairment via: – Patient education and practicing modifying the PMI during daily activities – HEP addressing the impairments that contribute to the PMI Copyright Program in Physical Therapy Washington University School of Medicine - St. Louis 3 Insufficient Scapular Posterior Tilt Scapular Internal Rotation and and External Rotation (end range) Anterior Tilt Due to a muscle activation problem: Movement Impairment: – Excessive IR/anterior tilting during the return from flexion » Criteria: not significant if the IR/tilting does not occur until the last 30-40 degrees of the return motion especially if the scapula is just resuming its starting alignment. – Scapular IR/anterior tilting with the initiation of flexion especially with heavy arms - > post Deltoid Scapular Internal Rotation and Scapular Internal Rotation and Anterior Tilt Anterior Tilt (Winging and Tilting) Movement Impairments when there is a muscle activation problem – These patients usually have a combination of IR and tilting Scapular motion controlled – elbow extended Scapular IR and Tilting: return from Flexion (strength 3/5 on MMT) (muscle activation problem) Copyright Program in Physical Therapy Washington University School of Medicine - St. Louis 4 Scapular Internal Rotation and Insufficient Scapular Upward Anterior Tilt Rotation Movement Impairment insufficient scapular upward rotation during flexion and abduction – Criteria at the end range of shoulder flexion or abduction = 60 plus or miinus 5 of scapular upward rotation » normal SH rhythm is 60º of scapular upward rotation (Inman VT, 1934) – scapula downwardly rotates during arm rotation or when a load is placed on the arm Relative flexibility: The scapula does not move as readily as it should. The GH joint may move too much, not enough or the normal amount. Insufficient Scapular Upward Insufficient Scapular Upward Rotation Rotation Alignment: Movement Impairment – increased slope of shoulders – insufficient scapular upward rotation – vertebral border of scapula not may occur with excessive or insufficient parallel to spine scapular abduction – scapula may or may not be Criteria: abducted – Scapular adduction = root of spine of scapula <2.5 inches from vertebral spine at – humerus in abduction relative to end range shoulder flexion scapula – Scapular abduction = root of spine of scapula > or = 3.5 inches from vertebral – may have normal alignment at rest spine at end range shoulder flexion Insufficient Scapular Upward Insufficient Scapular Upward Rotation Rotation •Rhomboids more prominent than other scapular muscles = red flag •Rhomboids more prominent on left Intervention: Unsuccessful Correction of Alignment •SH muscles short on right Copyright Program in Physical Therapy Washington University School of Medicine - St. Louis 5 Left Side Involved Pathokinesiological Problem Onset after biking trip for several weeks with backpack on back; 20 y/o 32 Serratus anterior absent Recovery of SA function Video: initial (left) and 6 weeks later (right) Scapular Depression Scapular Depression Movement Impairment: – scapula fails to elevate sufficiently during abduction and flexion Symptoms »Criteria: at the end range of shoulder abduction or Pain can be located in upper trap area flexion the acromion should be aligned level with C6-7 Clavicle elevates 6-10° Ludewig PM 2009 Headaches associated with neck
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