rotator cuff anatomy - bonepit.combonepit.com/lectures/rotator cuff chuck kenney.pdf · august 1,...
TRANSCRIPT
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Rotator Cuff Anatomy
Dr. XXXXX
Hospital XXXXX
Date XXXXX
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Rotator Cuff
• Muscles/Tendons
• Individual Tendon Components
• Supraspinatus Anomalies
• Anterior Fibers of Supraspinatus
• Infraspinatus
• Greater Tuberosity Anatomy
• Bare Area of GT
• Interdigitation Artifact
• 4-5 Histologic Layers
• Cable Crescent Component
• Teres Minor
• Subscapularis
• Rotator Intervals
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Rotator Cuff Muscles
• Supraspinatus
• Infraspinatus
• Teres Minor
• Subscapularis
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• Muscular origin Supraspinatus Fossa
• Inserts on Greater Tuberosity
• Innervation from Suprascapular Nerve
• Triple Blood Supply
• Two and Perhaps three main tendinous components
Supraspinatus
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Supraspinatus
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Supraspinatus Anomalies
• Separate Muscular origins from the
Supraspinatus fossa, anterior component
intramuscular tendon and posterior
component lateral tendon
• Accessory Slip extends to Lesser
Tuberosity
• ????
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Accessory Anterior Slip of Supra
• 10/37 cadaveric specimens, 1 with FT
RCT
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• Insertional fibers-
Rim Rent Tears
• Critical Zone-
Hypovascular
• Intramuscular/Mus
culotendinous
Zonal Anatomy of Supraspinatus
Tendon .
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Anterior Insertional Fibers
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Anterior Insertional Fibers/Rim Rent
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Rim Rent Tears
• Younger Patents anterior insertional SS
tears, frequently with adjacent bone
changes
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Anomalous Supraspinatus
Tendon 1
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Anomalous Supraspinatus
with Prominent RI Slip
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Intraspinatus
• Muscular Origin
Infraspinatus Fossa
• Multicircumpennate
• Innervated
Suprascapular Nerve
• Inserts on Oblique
Facet Greater
Tuberosity
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• Superior/Horizontal Facet—Anterior and
Mid Fibers of Supraspinatus
• Middle/Oblique Facet---Upper ½ receives
overlapping fibers of Supra and
Infraspinatus, Lower ½ Infraspinatus
• Posterior/Vertical Facet---Teres Minor
Greater Tuberosity Anatomy
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Greater Tuberosity Anatomy
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Interdigitation Artifact
August 1, 2001 - Volume 22, Issue 4
Shoulder MRI refinements: differentiation of rotator cuff tear from artifacts
and tendonosis, and reassessment of normal findings.
Wright T; Yoon C; Schmit BP Seminars in US, CT, MRI
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Greater Tuberosity Anatomy
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Supra, Infra, Bare Area
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Cystic Lesions in the Posterosuperior Portion of the Humeral Head on MR Arthrography:
Correlations with Gross and Histologic Findings in Cadavers
Wook Jin1, Kyung Nam Ryu2, Yong Koo Park3, Weon Kyu Lee4, Sung Hye Ko2 and Dal Mo
Yang1
AJR 2005; 184:1211-1215
Cystic Changes at Bare Area
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4-5 Layers of the Rotator Cuff
• Clark-5 layers
• CHL&Rotator Cable 1,4
• Capsule 5
• 3 and 2 differ in orientation
• Fallon’s-4 layers
Capsule
CHL
Tendons
Attachment Fibrocartilage
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Rotator Cuff Cable/Crescent
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Cable/Crescent
• Cable component of the CHL (layer 4), thick fibrous tissue visible arthroscopically bounds thinner Crescent shaped portion of the distal cuff
• Extends from anterior Supra to Infra
• Functions as “Suspension Bridge”
• Shields the thinner crescent from undue stress
• Limits the degree of retraction of RCT
• Cable dominant/non dominant shoulders
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Rotator Cuff Cable/Crescent
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Rotator Cuff Cable/Crescent
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Rotator Cuff Cable/Crescent
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Rotator Cuff Cable/Crescent
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“Cable Dominant”
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Cable Dominant PT RCT
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Cable Dominant with FT RCT
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Teres Minor
• Originates lower inferior edge of scapula
• Inserts on Vertical Facet of Greater Tub
• Innervated by Axillary Nerve
• May show atrophy/denervation changes “Quadrilateral Space Syndrome”/Fibrous Bands
• Isolated Teres Minor abnormality typical---Nonspecific, d/t prior Trauma, Posterior Dislocation, Instability
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45 y/o female with Adh Capsulitis,
SS PT RCT, Teres Minor Atrophy
3% of Routine Shoulder
MRs
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Subscapularis
• Broad origin on the ventral surface of the scapula
• Multicircumpennate similar to infraspinatus
• Inserts on lesser tuberosity
• Contributes to “transverse humeral” ligament
• Inferior muscular portion that inserts near surgical neck of humerus
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Subscapularis
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History of Dislocation
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History of Dislocation
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Rotator Interval(s)
• Anterior Rotator Interval Medial and Lateral Portions
• Medially-Fat, RI Capsule, CHL, SGHL
• Lateral Apex-more complex anatomy, above components plus fibers from Supraspin and Subscapularis
• Focal RI tears, Site of Fibrosis in Adhesive Capsulitis
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Posterior Rotator Interval
Anatomy of the Posterior Rotator Interval:
Implications for Cuff Mobilization. Miller et al.
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PRI Normal
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PRI Abnormal
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Posterior Rotator Interval Findings
• Site for Arthroscopic Port Placement
• Normal Joint Recess
• Potential Space for Perilabral Cysts
• Adhesive Capsulitis
• Vessels
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Biceps Pulley Impingement
25 y/o surfer with pain during
paddling and findings of bicipital
tendonitis on physical exam
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