Low Yield Flashcards
Where do the trapezoid and conoid ligaments insert on the clavicle?
Trapezoid- 3.0cm from distal end
Conoid- 4.5cm from distal end
What portion of the AC ligament is strongest?
Superior
2nd is posterior
Where is the most common location for an os acromiale?
Junction of the meso- and meta- acromion;
60% are bilateral
Treated with bone grafting and second stage acromioplasty
What are shoulder exam findings of impingement?
1) Neer- positive with 70-110 degrees of forward flexion
2) Hawkins- internal rotation with passive forward flexion to 90 degrees
3) Internal impingement- pain with abduction and external rotation
What are common radiographic findings in shoulder impingement?
1) proximal migration of the humerus (rotator cuff arthropathy)
2) traction osteophytes
3) coracoacromial ligament ossification
4) type III-hooked acromion
Which patients have poorer outcomes with subacromial decompression?
worker’s compensation
What are the 5 main phases of throwing?
1) wind-up
2) cocking (early and late)
3) acceleration
4) deceleration (highest torque phase)
5) follow-through
What are shoulder exam findings of rotator cuff tear?
1) Internal rotation lag- hand held away from lumbar spine, will fall into spine if tear of subscap; can also do belly press
2) Jobe’s test and drop arm-supraspinatus
3) Hornblower’s- arm held in external rotation, positive for teres minor tear if drops into internal rotation
What are shoulder exam findings of SLAP tear?
1) Crank test- abduct arm and apply axial pressure with IR/ER, pain or crepitus is positive
2) O’Brien’s test- adduct arm 10° and forward flex 70°, apply pressure with hand supinated and pronated; positive if pain with pronation but not supination (if pain is “deep” then SLAP, if superficial then AC joint pathology)
What are shoulder exam findings of biceps injuries?
1) Speed’s test- forward elevate the arm against resistance with elbow extended
2) Yergason’s- resisted supination of pronated wrist with elbow flexed
3) Popeye sign- indicates long head rupture
What are shoulder exam findings of shoulder instability?
1) Apprehension and relocation- ER and abduct to 90°, will be apprehensive will dislocate, posterior direct force at GH joint will relieve pain and apprehension (anterior instability)
2) Anterior drawer (anterior instability); 1-to glenoid rim, 2- over glenoid rim but reduces, 3- locks outside glenoid rim
What are shoulder exam findings of AC joint pathology?
1) O’Brien’s test- adduct arm 10° and forward flex 70°, apply pressure with hand supinated and pronated; positive if pain with pronation but not supination (if pain is “deep” then SLAP, if superficial then AC joint pathology)
2) Adduction test- pain in AC joint with cross body adduction
3) Sulcus sign- pull arm inferior; sulcus is sign of MDI (multidirectional instability)
4) Loss of internal rotation can be sign of posterior dislocation
What are shoulder exam findings of other pathology?
1) Wright’ test- (for thoracic outlet syndrome) passively externally rotate and abduct the patient’s arm while having the patient turn their neck away from (Adson’s turns head towards) the tested extremity; positive if loss of pulse
2) Medial scapular winging- inferior border of the scapula migrates medially; injury to long thoracic nerve
3) Lateral scapular winging- inferior border of scapula migrate laterally; injury to CN XI (spinal accessory n.)
What is the most common tendon affected by calcific tendonitis?
Supraspinatus tendon; MC in women aged 30-60; a/w DM and hypothyroidism; pain MC in resorptive phase
When compared to tenotomy of biceps tendon, what are some advantages of a biceps tenodesis?
tenodesis may decrease subjective arm cramping and improve cosmesis
Distal clavicle osteolysis is commonly seen in what patients?
Weight lifters; repetitive microfractures lead to osteopenia; treat with activity modification, NSAIDs, steroid inj or arthroscopic DCE
Which type of shoulder dislocation has the highest incidence of neurovascular injury?
Inferior; Luxatio erecta
What is little leaguer’s shoulder?
A salter harris I injury to the proximal humerus physis (hypertrophic zone) seen in adolescent pitchers (breaking pitches)
Can lead to premature growth arrest
What are a reverse Bankhart lesion and a Kim lesion?
Reverse bankhart- tear of posterior labrum
Kim lesion- incomplete avulsion of posterior labrum
What structure is at risk when repairing a posterior labral tear?
The axillary n.
Travels within 1mm of the inferior shoulder capsule and glenoid rim
What is scapulothoracic dyskinesis?
Abnormal scapula motion leading to shoulder impingement and dysfunction cause are multifactorial:
1) neurologic injury
2) pathologic thoracic spine kyphosis
3) periscapular muscle fatigue
4) poor throwing mechanics
5) secondary to pain (shoulder, neck)
Treat with PT, core strengthening and teaching proper throwing mechanics
What are the provacative tests for thoracic outlet syndrome?
Wright
abduction and external rotation with the neck rotated away leads to loss of pulse and reproduction of symptoms
Adson
extension of the arm with the neck extended and turned towards the affected side may result in loss of radial pulse or reproduction of symptoms with inhaling
Roos
hands repeatedly opened and closed while holding them overhead for 1 minute can reproduce symptoms
What are risk factors for a triceps rupture?
1) Renal osteodystrophy
2) Anabolic steroid use
3) Fluoroquiniolones
4) Local steroid injection
What is the MC mechanism of a triceps rupture?
Eccentric contraction
Common in males and weight lifters, may see a “flake sign” on lateral radiograph
What nerve compression syndrome, that if becomes chronic can lead to deltoid and teres minor atrophy?
Quadrilateral space syndrome;
compression of the axillary n. and posterior circumflex humeral a. in quadilateral (quadrangular) space
What are the boundaries of the quadrangular space?
Lateral- surgical neck of humerus
Superior- Subscap and teres minor
Inferior- teres major
Medial- long head of triceps
What are the symptoms of quadrangular space syndrome?
Poorly localized pain in the posterolateral shoulder that is usually worse at night and with overhead activities; point tenderness over quadrangular space
MRI will show teres minor and deltoid atrophy; EMG is diagnostic and shows axillary n. involvement
What are indications for shoulder hemiarthoplasty?
Contraindications?
Indications:
1) DJD with rotator cuff arthropathy and shoulder flexion of >90°
2) DJD and risk of glenoid loosening (young active, laborer)
3) Osteonecrosis of humeral head
4) 3-4 part fractures in older
5) head splitting fractures
Contraindications:
1) infection
2) neuropathic joint
3) unmotivated patient
4) Coracoacromial ligament deficiency (prevents anteriosuperior migration if have RCT)
What is the most important determinant of outcome in shoulder hemiarthroplasty?
Condition of the rotator cuff
Outcomes also inversely proportional to age and time from injury to operation
What are important techniques when implanting a shoulder hemiarthroplasty?
1) aim for 30° retroversion
2) Cemented is better
3) tuberosity reduction should be anatomic (MC cause of failure)
4) Greater tuberosity shoulder be 3-5mm below humeral head
5) Distance from top of prosthesis to superior border of pec major is 56mm
What is the MC mechanism for pectoralis major rupture?
excessive tension on a maximally eccentrically contracted muscle
Almost always male; common in weight lifters
What are the physical exam findings for pectoralis major rupture?
1) Ecchymosis down arm (tendon avulsion)
2) Weakness or pain with resisted adduction and internal rotation
3) Pt may describe a tearing sensation
4) Palpable defect in axillary fold, asymmetry of chest
Most are treated with NSAIDs, rest and ice; athletes can have primary repair
Where is the MC location for an OCD lesion of the elbow?
Capitellum
Gymnast or throwing athletes; typically after age 10 with lateral arm pain and possible elbow effusion. Also clicking or catching in joint
What is the position of the shoulder for a glenohumeral fusion?
30-30-30
Abduction-flexion-internal rotation
What are a few indications for a shoulder fusion?
Brachial plexopathy
Salvage for failed TSA
Paralytic disorders
What is an overuse syndrome of the flexor-pronator mass?
Medial epicondylitis (Golfer's elbow) Pronator teres and FCR most commonly