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This is a clinician-written, evidence-based guide aligned to the MCC Examination Objectives. It is structured by clinical presentation — the way the MCCQE tests and the way patients actually present. Management reflects current Canadian guidelines (CMA, CFPC, CPS). Always cross-reference with institutional protocols and clinical judgment.
Key points
- A fragility fracture after age 50 is osteoporosis until proven otherwise and predicts future fracture
- Hip and vertebral fractures are high-risk presentations requiring treatment consideration regardless of BMD details
- Assess fracture risk, falls risk, secondary causes, renal function, calcium/vitamin D intake, and medication contributors
- DEXA supports diagnosis and monitoring but treatment decisions are risk-based, not T-score alone
- First-line pharmacotherapy commonly uses bisphosphonates; anabolic or specialist therapies are used for very high-risk patients
Approach to the Presentation
Osteoporosis presents as low-trauma fracture, height loss, kyphosis, back pain from vertebral compression fracture, low BMD, or incidental imaging comment. The MCCQE1 approach is practical: treat the fracture, identify whether it was fragility-related, estimate future fracture risk, evaluate secondary causes, prevent falls, and initiate pharmacologic therapy when risk is high. Osteoporosis Canada’s 2023 guideline emphasises exercise, nutrition, fracture risk assessment, pharmacotherapy, and good practice statements. The exam often tests that a fragility hip or vertebral fracture is not simply an orthopaedic event; it is a sentinel endocrine/metabolic risk event.
Differential Diagnosis
| diagnosis | likelihood | key features | distinguishing test |
|---|---|---|---|
| Fragility Hip or Vertebral Fracture | must-not-miss | Low-trauma fall from standing height or less; hip pain/inability to weight-bear or acute back pain/height loss; high future fracture risk | X-ray/CT/MRI for fracture; osteoporosis treatment assessment regardless of DEXA delay |
| Malignancy / Pathological Fracture | must-not-miss | Night pain, weight loss, focal bone pain, lytic lesions, anaemia, renal dysfunction, known cancer | Imaging pattern, CBC, calcium, SPEP/free light chains, cancer workup |
| Osteomalacia / Severe Vitamin D Deficiency | must-not-miss | Diffuse bone pain, proximal weakness, low calcium/phosphate, high ALP, malabsorption, limited sun exposure | 25-OH vitamin D, calcium, phosphate, ALP, PTH |
| Primary Hyperparathyroidism | must-not-miss | Osteoporosis, kidney stones, hypercalcemia, constipation, neuropsychiatric symptoms | Calcium high with inappropriately high/normal PTH |
| Postmenopausal or Age-related Osteoporosis | common | Older age, menopause, family history, low BMI, prior fracture, smoking, alcohol, low activity | DEXA T-score and fracture risk assessment |
| Glucocorticoid-induced Osteoporosis | common | Current or recent prednisone or equivalent, transplant/autoimmune disease, inhaled or injected steroid burden | Medication history; early fracture risk assessment and preventive therapy |
| Hypogonadism-related Bone Loss | less common | Early menopause, amenorrhoea, eating disorder, androgen deprivation therapy, low libido or testosterone deficiency | Menstrual/sexual history, LH/FSH/estradiol or testosterone as indicated |
| Hyperthyroidism or Levothyroxine Over-replacement | less common | Weight loss, tremor, palpitations, low TSH, AF, bone loss | TSH/free T4 |
| Chronic Kidney Disease-Mineral Bone Disorder | less common | CKD, abnormal phosphate/PTH, renal osteodystrophy; fracture risk and treatment choices differ | eGFR, calcium, phosphate, PTH, alkaline phosphatase |
Red Flags & Key History
Symptoms
Hip fracture, vertebral fracture, multiple fractures, or fracture from standing-height fall after age 50
Back pain with neurological deficit, bladder/bowel symptoms, or cancer history
Unexplained weight loss, night pain, anaemia, renal failure, or high calcium — consider malignancy/myeloma
Long-term glucocorticoid therapy or aromatase/androgen deprivation therapy
Recurrent falls, syncope, visual impairment, sedatives, alcohol use, or unsafe home environment
Height loss, kyphosis, dental issues, low dietary calcium, low sunlight exposure
Early menopause, amenorrhoea, malabsorption, celiac symptoms
Signs
Inability to weight-bear after fall or shortened externally rotated leg — hip fracture
Focal spine tenderness, kyphosis, height loss, or rib-pelvis distance reduction
Neurological signs with back pain — cord or cauda equina concern
Proximal myopathy, bruising, wide striae — Cushing/glucocorticoid excess
Gait impairment, poor vision, orthostatic hypotension, or sedating medication effects
Approach to Investigation
First-line
X-ray of painful area after suspected fractureDo not rely on DEXA to diagnose an acute fracture
DEXA of hip and lumbar spineSupports BMD diagnosis and fracture risk stratification; include forearm in selected hyperparathyroid/obesity/artefact cases
Fracture risk assessmentUse Canadian fracture risk approach with clinical risk factors, BMD, age, sex, fracture history, and glucocorticoid exposure
Baseline labsCBC, calcium, phosphate, creatinine/eGFR, ALP, 25-OH vitamin D, TSH, and PTH when calcium abnormal
Second-line
Secondary cause workupTestosterone in men when indicated, celiac serology, SPEP/free light chains, cortisol testing, liver tests, or renal bone labs according to presentation
Vertebral fracture assessment or spine imagingFor height loss, kyphosis, back pain, or high suspicion of occult vertebral fracture
Falls assessmentOrthostatic vitals, vision, gait/balance, medication review, home hazards, footwear, assistive devices
Specialist
Fracture liaison service / osteoporosis specialistHip/vertebral fractures, multiple fractures, very high risk, renal impairment, treatment failure, or anabolic therapy consideration
Dental assessmentBefore antiresorptive therapy in selected high-risk dental contexts; do not delay urgent fracture prevention unnecessarily
Management Principles
Osteoporosis Canada 2023 Clinical Practice Guideline1
Immediate fracture-centred care
- Treat acute fracture pain, mobility, orthopaedic needs, and rehabilitation
- Start secondary fracture prevention before discharge or soon after; do not wait months for outpatient DEXA after hip/vertebral fragility fracture
- Assess fall risk and medication contributors such as sedatives, antihypertensives, alcohol, and hypoglycemia-causing drugs
2
Lifestyle and nutrition
- Weight-bearing, resistance, posture, and balance exercise adapted to fracture risk
- Ensure adequate calcium intake preferably through diet and vitamin D adequacy
- Smoking cessation, alcohol moderation, home safety, vision correction, and hip protectors when appropriate
3
Pharmacotherapy
- Oral bisphosphonates are common first-line for many high-risk patients if renal function and GI tolerance permit
- IV zoledronic acid or denosumab may be used when oral therapy is unsuitable; plan denosumab transition to avoid rebound vertebral fractures
- Very high-risk patients may need specialist anabolic therapy or sequential therapy
Complications & Pitfalls
- Waiting for DEXA after hip fracture: A fragility hip or vertebral fracture already indicates high risk
- Missing secondary causes: Myeloma, hyperparathyroidism, vitamin D deficiency, hyperthyroidism, celiac disease, hypogonadism, and steroids are exam favourites
- Ignoring falls: Medication review and balance/vision interventions can prevent more fractures than tablets alone
- Denosumab discontinuation: Stopping without follow-on antiresorptive therapy can cause rebound vertebral fractures
- Over-supplementing calcium: Aim for adequate intake, not indiscriminate high-dose supplementation
MCCQE1 Exam Tips
- 1Fragility fracture after age 50 is a sentinel event — treat future fracture risk
- 2Hip and vertebral fractures are high-risk even before DEXA
- 3DEXA informs risk, but treatment is risk-based, not T-score alone
- 4Always look for secondary causes in men, younger patients, severe osteoporosis, or atypical features
- 5Glucocorticoids cause rapid bone loss; prevention should begin early
- 6Falls assessment is core management, not an optional geriatric add-on
- 7Osteomalacia causes bone pain and weakness with low vitamin D/phosphate pattern
Put your reading into practice
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Choose MCCQE Part I questions from the existing bank. General exam practice covers your selected topics; it is not filtered to this article. Your usual question-bank access applies.
Choose MCCQE Part I practiceAfter your session, return to this section to revisit the reading and choose your next review.
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