Muscle Weakness
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each of the black spaces below before clicking
on it to display the answer.
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| 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
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| 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
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| 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
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| What happens with Middle Trap weakness? | 1) Lose stability in shoulder flexion;
2) Incr. Thoracic kyphosis
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| What happens with Levator Scapula weakness or tightness? | 1) Elevation of shoulder @ medial border, not at acromial end;
2) Usually cause of stiff neck
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| What happens with Pec Minor tightness? | 1) compression of Brachioplexus;
2) interferes with upward rotation of scapula;
3) shoulders elevate 1" off table
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| What happens with Pec Major tightness? | 1) limits External Rotation ROM
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| What happens with Latissimus Dorsi weakness/tightness? | 1) Limits shoulder Flexion ROM;
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| What happens with Teres Major weakness or tightness? | 1) Scapula will laterally rotate immediately with ABDuction;
2) Limited humeral External Rotation
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| What happens with Deltoid tightness? | 1) GH joint becomes ABDucted;
2) to compensate, shoulders become depressed and dwnwd rotated, drawing arms into thorax;
3)
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| What happens with Infraspinatus tightness? | 1)Contributes to mid-scapular tightness;
2) excessive anterior glide of humeral head, contributing to impingement;
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| 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);
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