8.1 Osteoporosis, Pathological Fracture and Tumour

Quick Answer: Osteoporosis increases fracture risk after low-energy loads. Physiotherapy uses load modification (avoid high-risk loaded spinal flexion and impact spikes) while still prescribing progressive strength and balance exercise—not lifelong total rest. Pathological fracture / tumour red flags (cancer history, night/rest pain, systemic features, minimal-trauma severe pain) need urgent medical escalation. Always link bone health to multi-factorial falls prevention.

Osteoporosis and low bone mass are common modifiers of musculoskeletal presentations in Australian practice, especially in older adults, post-menopausal women, people on long-term corticosteroids, those with endocrine or malabsorption disease, and people with marked immobility. On the APC Written Assessment, bone health rarely appears as an isolated “definition” question. It appears as a decision modifier: how you load the spine and limbs, how you interpret low-energy fracture, when pain is a red flag for pathological fracture or tumour, and how you integrate falls prevention with rehabilitation. Entry-level physiotherapists do not diagnose osteoporosis from DEXA alone or prescribe anti-resorptive drugs, but they must reason safely about load, falls, referral, and functional recovery.

Bone Health Concepts Relevant to Physiotherapy

Osteoporosis is characterised by reduced bone mineral density and microarchitectural deterioration, increasing fracture risk. Osteopenia / low bone mass sits on a continuum of risk. Clinically, what matters for your plan is not memorising T-score cut-offs for the exam so much as recognising high fracture risk contexts and adapting load, education, and environment.

Bone responds to mechanical load (Wolff’s law concepts at a clinical level): progressive, appropriately dosed loading can support bone health and function, while sudden high-risk loads can precipitate fracture in vulnerable bone. Immobility accelerates bone loss. Therefore, the worst long-term plan for many people with osteoporosis is complete activity avoidance driven by fear. The best plans combine safe progressive strength and balance training, falls risk reduction, nutrition/medical collaboration, and clear education about which movements are higher risk in early or severe disease.

Common high-risk populations in vignettes

Load Modification: Protect Without Paralysing

Load modification means temporarily or selectively reducing loads most likely to cause fracture while preserving and building capacity elsewhere. It is not synonymous with bed rest.

Higher-risk loading patterns (especially advanced spinal osteoporosis)

• Loaded or rapid spinal flexion combined with rotation (e.g., sit-up style abdominal exercises, toe-touches with weight, aggressive “crunches”)
• Heavy lifting from a flexed spine with poor control
• High-impact spikes without progressive preparation (unaccustomed jumping onto hard surfaces)
• Uncontrolled twisting under load
• Sudden falls onto outstretched hand or hip (environmental and balance focus)

Preferred training themes (entry-level, general principles)

• Progressive resistance training for major muscle groups, started at a tolerable load and advanced by form and symptom response
• Balance and dual-task training to reduce falls
• Weight-bearing activity as tolerated (walking programmes common; impact progressed carefully if appropriate and medically safe)
• Spinal extension-biased postural endurance and hip/trunk strength rather than repeated loaded flexion drills in high-risk spines
• Functional practice: sit-to-stand, step-ups, carrying light loads with neutral alignment education

Communication that matches Threshold-aligned care: “Your bones benefit from progressive strength and balance work. We will avoid sudden high-risk spinal loads and build capacity in a controlled way. If pain pattern changes—especially night pain, progressive rest pain, or pain after trivial injury—we re-evaluate urgently.”

Pathological Fracture: Recognise and Escalate

A pathological fracture occurs through bone weakened by disease (metastasis, primary bone tumour, severe osteoporosis, osteomyelitis, metabolic bone disease), often with minimal or no trauma. On MCQs, the stem may describe a “sprain after stepping off a kerb,” “back pain after bending to tie shoes,” or “thigh pain with no injury” in a person with cancer history. Treating this as an ordinary soft-tissue injury is a high-stakes error.

Red-flag cluster suggesting pathological fracture or serious bone disease

• Known malignancy, recent unexplained weight loss, night pain not eased by position change
• Pain progressive at rest, deep bone pain, or pain out of proportion to mechanism
• Fracture or severe pain after trivial load in an at-risk person
• Systemic features: fever (infection), night sweats, malaise
• Neurological deficit with spinal metastasis suspicion (cord/cauda patterns—emergency)
• Failure of expected healing or escalating pain despite protection

Physiotherapy action: stop provocative loading, protect the region appropriately, do not “push through”, arrange urgent medical/ED/orthopaedic review as indicated, document, and communicate clearly. Imaging and oncological/orthopaedic decisions sit with medical teams; your value is recognition, safety, and appropriate escalation.

Distinguishing osteoporotic fragility fracture from tumour-related pathological fracture (exam-level)

Both can present with low-energy injury. Fragility fracture in osteoporosis is common in vertebrae, hip, distal radius, and proximal humerus. Tumour-related pathological fracture raises concern when there is cancer history, constitutional symptoms, atypical site or progressive night pain, or multiple sites. You do not need to make a definitive tissue diagnosis from history alone—you need a threshold for medical imaging and specialist review that is lower when red flags cluster.

Bone Tumour Suspicion in MSK Practice

Primary bone tumours are less common than metastatic disease in adults, but both appear in teaching cases. Warning patterns include deep progressive bone pain, night pain, lump, unexplained limp in a child/adolescent, or pain not fitting mechanical patterns. Soft-tissue sarcoma concerns (progressive mass, deep fixed lump) also require medical referral rather than prolonged “massage and stretch” pathways.

Paediatric / adolescent vignette cue: night pain, limp, or bone pain without clear trauma—do not assume growing pains without careful reasoning and appropriate medical review when atypical features exist.

Adult with prior breast, prostate, lung, kidney, or thyroid cancer and new back/hip pain: lower your threshold for medical escalation; physiotherapy for “mechanical strain” without screening is unsafe if red flags are present.

Falls Risk: The Bridge Between Bone Health and Injury

Osteoporosis multiplies the consequence of a fall; falls risk multiplies fracture incidence. APC reasoning expects a multi-factorial falls lens, not only “do balance exercises.”

Key domains to screen and address

1. Intrinsic: previous falls, gait/balance deficit, muscle weakness, sarcopenia, orthostatic hypotension, incontinence urgency, cognitive impairment, depression, fear of falling
2. Sensory: vision, peripheral neuropathy, vestibular issues
3. Medications: sedatives, polypharmacy, recent medication changes (flag for medical/pharmacy review)
4. Environment: mats, lighting, footwear, steps, bathroom safety, outdoor surfaces
5. Behaviour: rushing, risk-taking, activity restriction that worsens deconditioning

Post-fracture care (e.g., after hip or vertebral fragility fracture) is incomplete if it only mobilises the fracture site. Reassess why the person fell, rebuild lower-limb strength, train safe transfers, review aids, and plan community exercise that is sustainable. Vertebral fracture may present as acute thoracic/lumbar pain with height loss or kyphosis change—still screen for neurological deficit and red flags while supporting mobilisation as medically allowed.

Australian Setting Patterns

Private practice

A 72-year-old with thoracic pain after lifting a grandchild, known osteoporosis, no cord signs: educate on bone-safe movement, avoid loaded flexion drills, start gentle activation and walking, liaise with GP regarding pain control and bone health plan, commence falls prevention, safety-net for progressive neurology or night pain with systemic features.

Hospital / subacute

Post neck-of-femur fracture: early mobilisation per orthopaedic protocol, DVT awareness, delirium/falls precautions, discharge planning, hip precautions only if specified by surgical approach (do not invent universal “no flexion ever” rules without protocol), progressive gait and strength, osteoporosis and falls secondary prevention pathway with the team.

Community / aged care

Focus on transferable strength (sit-to-stand), balance, footwear, lighting, staff education, and avoiding both under-activity and unsupervised high-risk exercise fads.

High-Yield Exam Distinctions

Putting It Together for APC MCQs

1. Bone health modifies load—progressive strength and balance are first-line allies; high-risk spinal flexion under load is not.
2. Minimal trauma + severe pain = consider fragility or pathological fracture, not “just a strain.”
3. Cancer history + night/rest pain + systemic features = escalate; do not treat as ordinary mechanical pain.
4. Falls risk is multi-factorial—always link osteoporosis cases to prevention, not only local joint treatment.
5. Scope clarity—you screen, educate, load safely, and refer; you do not replace medical diagnosis of tumour or osteoporosis pharmacology.
6. Fear management—avoid creating kinesiophobia while still teaching genuine precautions.

Self-check before moving on

1. Can I list load modifications for osteoporotic spines without prescribing total rest?
2. Can I recognise pathological fracture / tumour red flags and escalate?
3. Can I connect falls domains to a concrete plan after fragility fracture?
4. Can I explain why strength training remains indicated in osteoporosis for most people?
5. Can I distinguish mechanical back pain management from serious bone pathology pathways?

If yes, you are ready for amputations and congenital musculoskeletal conditions, where residual limb care, prosthesis readiness, and family-centred paediatric pathways dominate decision-making.