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First Aid for the USMLE Step 2 CK (10th Ed.)
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Pediatric Musculoskeletal Disorders

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First Aid for the USMLE Step 2 CK (10th Ed.) | Medicine (MD/DO) School Study Aid

Pediatric Musculoskeletal Disorders
17 Picmonics to Learn | 45 mins
Muscular Dystrophy
Mechanism
X-linked Recessive
Signs and Symptoms
Muscle Weakness
Motor Problems
Gower Sign
Large Calves
Waddling Gait
Loss of Ambulation
Consideration
Cardiac and Respiratory Failure
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2 mins
Ewing's Sarcoma
Epidemiology
Most Common in Boys < 15 years old
Pathophysiology
11;22 Translocation
Characteristics
Long bones, Pelvis, Ribs
Diaphysis
Small Blue Cells
Malignant
Aggressive
Onion-skin Appearance
TREATMENT
Responsive to Chemotherapy
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2 mins
Osteosarcoma
Pathophysiology
Osteogenic Sarcoma
Peak incidence men 10-20 years old
Metaphysis of Long Bones
Knee Region
Radiation
Familial Retinoblastoma
Paget's Disease
Diagnosis
Codman Triangle
Sunburst Pattern from Elevated Periosteum
Grave Prognosis
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2 mins
Supracondylar Fracture Of Humerus
Mechanism
Fall On Outstretched Hand (FOOSH)
More Common In Children
Signs & Symptoms
Elbow Pain & Swelling
Diagnosis
X-ray Shows Elbow Effusion
Anterior Sail Sign
Posterior Fat Pad Sign
Treatment
Non-displaced: Splint And Sling
Displaced: Closed Reduction With Percutaneous Pin Placement
Considerations
Compartment Syndrome
Volkmann Ischemic Contracture
Brachial Artery Injury
Median Nerve Palsy
Cubitus Varus Deformity
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3 mins
Types of Fractures
Nondisplaced
Displaced
Incomplete
Complete
Closed
Open
Direction of Fracture Line
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2 mins
Salter-Harris Fracture Classification
SMACK
Slipped Across Physis (Type 1)
Metaphysis and Physis (Type 2)
Articular-Epiphyseal (Type 3)
Complete Metaphysis and Epiphysis (Type 4)
Krushed Physis (Type 5)
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2 mins
Nursemaid's Elbow (Radial Head Subluxation)
Pathophysiology
Radial Head Subluxation
Inferiorly Under Annular Ligament
Axial Traction on Forearm
Pulled or Lifted by the Hand or Forearm
Children Aged (1-4 Years Old)
Signs & Symptoms
Extended & Pronated Forearm
Refusal to Bend Elbow
Treatment
Manual Reduction
Hyperpronation of Forearm
Gentle Supination of Elbow at 90 Degrees Flexion
No Immobilization
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3 mins
Osgood-Schlatter Disease (Tibial Tubercle Apophysitis)
Pathophysiology
Apophysitis of Tibial Tubercle
Active, Young Boys
Running and Jumping
Overuse Injury
Recent Growth Spurt
Signs and Symptoms
Diagnosis Made on History
Anterior Knee Pain
Enlarged Tibial Tubercle
Edema
Treatment
Rest
NSAIDs
Activity Restriction
Self-limiting
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2 mins
Myotonic Dystrophy
Pathophysiology
Autosomal Dominant
Trinucleotide Repeat
CTG
Signs and Symptoms
Facial Muscle Weakness
Frontal Balding
Sustained Grip
Conduction Defects
Cataracts
Selective Atrophy of Type 1 Fibers
Testicular Atrophy
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2 mins
Clubfoot
Cause/Mechanism
Multifactorial Congenital Anomalies
Fetal Position
Assessment
Deformed Foot and Ankle Position
Talipes Equinovarus
Interventions
Serial Casting
Ponseti Method
Early Surgery
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2 mins
Developmental Dysplasia of the Hip
Cause
Abnormal Femoral Head in Acetabulum
Newborn Assessment
Positive Barlow Sign
Clicking with Adduction
Positive Ortolani Sign
Clicking with Abduction
Asymmetrical Limb Lengths and Folds (Gluteal and Thigh)
Older Child Assessment
Trendelenburg Sign
Interventions
Abduction Device
Pavlik Harness
Closed Reduction
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3 mins
Legg-Calve-Perthes Disease
Pathophysiology
Idiopathic Avascular Necrosis of Femoral Head
Boys 5-7 Years of Age
Symptoms < 18 Months
Signs & Symptoms
Painless Limp
Limited Range of Motion
Intermittent Anterior Thigh Pain
Insidious Pain in Knee
Atrophy of Upper Thigh
Diagnosis
AP and Frog Leg Lateral X-ray
Compression and Deformity of Femoral Head
Treatment
Bed Rest
NSAIDs
Containment with Brace or Cast
Surgery
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4 mins
Slipped Capital Femoral Epiphysis (SCFE)
Pathophysiology
Separation of Femoral Epiphysis from Femoral Neck
Through Growth Plate (Physeal Plate)
Obesity
Male Adolescents
African American
Growth and Sex Hormone Imbalances
Signs & Symptoms
Thigh or Knee Pain
Inability to Bear Weight
Decreased Internal Rotation of Hip
Obligate External Rotation of Hip with Flexion
Diagnosis
Frog Leg Lateral X-ray
Treatment
Surgical Pinning
Complications
Avascular Necrosis of Femoral Head
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3 mins
Scoliosis
Assessment
S Shaped Lateral Spinal Rotation
Unequal Shoulder and Scapula Height
Uneven Gait
Impaired Oxygenation
Hump when Bending Forward
Interventions
Body Braces
Worn 23 Hours/Day
Surgery
Considerations
Adolescent Screening
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3 mins
Charcot Marie Tooth Disease
Pathophysiology
Hereditary Motor Sensory Neuropathy
Autosomal Dominant
PMP22 Duplication
Schwann Cell Dysfunction
Clinical Features
Distal Muscle Weakness
Foot Drop
Calf Muscle Atrophy
Scoliosis
Hammertoes
Pes Cavus
Diagnosis
Onion-skin Appearance on Nerve Biopsy
Electrodiagnostic Studies
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5 mins
Langerhans Cell Histiocytosis
Characteristics
Antigen Presentation Defect
Lytic Bone Lesions
Skull
Presentation
Hypopituitarism
Diabetes Insipidus
Skin Rash
Recurrent Otitis Media
Diagnosis
Birbeck Granules
"Tennis Racket" Appearance
S100 Positive
Management
Observation
Prednisone +/- Vinblastine
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4 mins
Medial Tibial Stress Syndrome
Pathophysiology
Overuse Injury
Periosteal Inflammation
Clinical Findings
Diffuse Tibial Pain
Diagnosis
Diagnosis by Clinical Impression
Treatment
Conservative Therapy
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1 min

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