The Calgary Guide to Understanding Disease @TheCalgaryGuide
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Menstrual Cycle Physiology: Ovarian Cycle – Ovulation Explained

Around Day 14, estrogen exerts sudden +++ positive feedback
sudden +++ positive feedback ... on the anterior ... negative to positive feedback ... for clarity) #MenstrualCycle ... #OvarianCycle #pathophysiology
Classification of Pelvic Ring Fractures: Mechanisms, Clinical Features and Complications
 • Anterior Posterior Compression (APC) -
Complications • Anterior ... Anterior Sl diastasis ... displacement, anterior ... Grades #Grading #Orthopedics ... complications #pathophysiology
Menstrual Cycle Physiology: The Hypothalamic-Pituitary-Ovarian Axis
Estrogen, when released:
 • Negatively feeds back on the hypothalamus and
hypothalamus and anterior ... hypothalamus and anterior ... #MenstrualCycle ... #pathophysiology ... endocrinology #feedback
Stress Fracture: Pathogenesis and clinical findings
Abnormal biomechanics, Repetitive impact activities
=> Repetitive subthreshold mechanical loading
=> Bone strain
=>
Stress Fracture: ... => Microscopic fractures ... loading Stress Fracture ... StressFractures #msk #orthopedics ... #pathophysiology
Femoral Head Fracture: Pathogenesis and clinical findings
 • Posterior hip dislocation -> Impaction force from femoral
Femoral Head Fracture ... acetabular wall • Anterior ... femoral head onto anterior ... msk #diagnosis #pathophysiology ... signs #symptoms #orthopedics
Subtrochanteric Femur Fracture: Pathogenesis and clinical findings
 • Subtrochanteric region spans 5 cm distally from the
Subtrochanteric Femur Fracture ... low energy fall fractures ... Atypical femur fracture ... #msk #orthopedics ... differential #causes #pathophysiology
Anterior Shoulder Dislocation: Pathogenesis, clinical, and radiographic findings

Trauma, Fall on, outstretched arm, Overhead throwing => Abduction
Anterior Shoulder ... • Humeral head anterior ... bone -> Pain #Anterior ... symptoms #msk #orthopedics ... #pathophysiology
Menstrual Cycle Physiology: Ovarian Cycle – Luteal Phase Explained
 • The LH surge can be thought
hypothalamus and anterior ... Ovarian Cycle #MenstrualCycle ... #OvarianCycle #pathophysiology
Acute Spinal Cord Injuries: Pathogenesis and clinical findings
 • Anterior Cord Syndrome -> Anterior spinal artery
clinical findings • Anterior ... Cord Syndrome -> Anterior ... Syndromes #diagnosis #pathophysiology ... symptoms #msk #orthopedics
Acute Compartment Syndrome
 • Crush injuries, burns, circumferential constriction to limbs (each containing facially divided muscle
bleeding tendency/fracture ... CompartmentSyndrome #ACS #pathophysiology ... #orthopedics