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Upper Body

Muscle Weakness

QuestionAnswer
What happens with Serratus Anterior weakness? 1) Full active shoulder flexion/elevation is not possible; 2) Pec Min, Lev Scap, Rhomb. still elevate but lose abd/rot of Inf. Angle of scap, resulting in ADDucted(med/post) scapula; 3)Scap-hum. muscles can't maintain optimal length tension relationshp
What happens with Rhomboid Major weakness? 1) ADDuction weakness 2* lose downward rotation; 2) EXTension weakness of humerus 2* lose retraction; 3) Increased tension on Levator; 4) Lats/Triceps lose ability
What happens with Upper Trap weakness? 1) Lev & Rhombds become dominant creating dwnwd rot force on scap; 2) Acromion end drops & shld moves fwd; 3) Inability to effectively elevate & abd humerus; 4)Incr. tension if serratus doesn't initiate upwd rot.; 5)If Serr. takes over, excess ABD of
What happens with Middle Trap weakness? 1) Lose stability in shoulder flexion; 2) Incr. Thoracic kyphosis
What happens with Levator Scapula weakness or tightness? 1) Elevation of shoulder @ medial border, not at acromial end; 2) Usually cause of stiff neck
What happens with Pec Minor tightness? 1) compression of Brachioplexus; 2) interferes with upward rotation of scapula; 3) shoulders elevate 1" off table
What happens with Pec Major tightness? 1) limits External Rotation ROM
What happens with Latissimus Dorsi weakness/tightness? 1) Limits shoulder Flexion ROM;
What happens with Teres Major weakness or tightness? 1) Scapula will laterally rotate immediately with ABDuction; 2) Limited humeral External Rotation
What happens with Deltoid tightness? 1) GH joint becomes ABDucted; 2) to compensate, shoulders become depressed and dwnwd rotated, drawing arms into thorax; 3)
What happens with Infraspinatus tightness? 1)Contributes to mid-scapular tightness; 2) excessive anterior glide of humeral head, contributing to impingement;
What happens with Subscapularis weakness or tightness? 1) Limits function of Supination; 2) Impingement of humeral head with abduction and elevation (lose posterior pull and depression);