How Does Osteoporosis Affect Fracture Risk?

Summary: Osteoporosis reduces bone strength, increasing the risk of low-energy fractures, particularly at the hip, spine and wrist. Individual risk is determined by considering bone mineral density measurements, age, previous fractures and the likelihood of falls together. The aim is to understand the person's overall risk profile, not just the bone density value.

Osteoporosis changes fracture risk by reducing the bone's structural strength, making a fall or strain that might seem ordinary in daily life more likely to cause a fracture. Bone mineral density is therefore important but insufficient on its own; age, previous fractures, coexisting conditions and fall risk are also assessed. Tools such as FRAX use these factors to help calculate 10-year fracture probability (PMID 37874461 — An overview of the use of the fracture risk assessment tool (FRAX) in osteoporosis, 2024).

The key point is that a first osteoporotic fracture may sometimes be the first recognised sign of the condition. A hip fracture after an older person falls at home, or vertebral fractures accompanying back pain that begins without significant trauma, may suggest reduced load-bearing capacity of the bone. Decisions in this situation consider not only pain severity, but also fracture location, mobility, general health and the risk of another fracture.

Why Does Osteoporosis Increase Fracture Risk?

Osteoporosis increases fracture risk by impairing bone mineral density and internal architecture. As the outer shell thins and connections in the spongy structure weaken, bone becomes less able to distribute force during a fall or sudden loading. A low-energy injury that healthy bone could withstand may therefore cause an osteoporotic fracture.

Bone strength does not depend solely on ‘how much calcium it contains’. Tissue structure, the balance of bone remodelling and accumulated microscopic damage also matter, alongside bone mineral density. A T-score of −2.5 or lower measured by dual-energy X-ray absorptiometry is consistent with osteoporosis, but fracture risk is not defined by one measurement alone. This threshold and risk assessment are discussed in the 2022 publication The clinician’s guide to prevention and treatment of osteoporosis (PMID 35478046).

Several changes contribute together to increased fragility:

• Bone loss: The load that the bone can bear decreases.
• Impaired microarchitecture: Supporting connections within spongy bone become fewer and thinner.
• Cortical thinning: The outer shell of the bone becomes less resistant to impact.
• Accumulation of microdamage: Repair of small injuries caused by everyday loading may become insufficient.
• Low-energy trauma: Events such as falling from standing, turning suddenly or bending may trigger a fracture.

This does not mean that ‘a fracture is inevitable if there is osteoporosis’. Osteoporotic fracture risk reflects the combination of structural bone weakness, the likelihood of falls and coexisting health conditions. A fracture therefore cannot be predicted with certainty from back pain or a single bone density result alone.

Where Do Osteoporotic Fractures Occur Most Often?

Osteoporotic fractures occur most often in the spine, hip, wrist and upper humerus near the shoulder. When bone mineral density and internal structure weaken, low-energy injuries such as a fall from standing height can cause fractures in these areas; vertebral fractures may sometimes develop without an obvious fall.

Fracture location affects the symptoms and impact on everyday life:

• Spine: Vertebral fractures are often compression fractures in the thoracic or lumbar spine. New back pain, loss of height and a forward stoop may occur. Some fractures may go unnoticed without significant pain.
• Hip: A hip fracture usually affects the part of the femur close to the hip joint. Inability to stand up, groin pain or inability to bear weight after a fall requires assessment, especially in an older patient.
• Wrist: Reaching a hand out during a fall can cause a wrist fracture. This may sometimes be the first recognised sign of osteoporotic bone fragility.
• Upper arm: Falling onto the shoulder can fracture the upper humerus near the shoulder joint. Pain and swelling around the shoulder and inability to raise the arm may occur.
• Pelvis and other areas: Osteoporotic fractures can also develop in the pelvis, ribs and certain long bones, but not every fracture is explained by osteoporosis alone.

A low-energy fracture after the age of 50 is a clinical warning requiring assessment of bone strength and future fracture risk. A previous fracture is also among the factors that can increase the risk of another fracture (The clinician’s guide to prevention and treatment of osteoporosis, 2022; PMID 35478046).

Why Are Hip and Vertebral Fractures Important?

Hip and vertebral fractures matter because they can affect not only bone but also independent mobility, breathing and everyday life. A hip fracture makes standing up difficult, especially in older patients, while vertebral fractures may occur without obvious trauma and become apparent through height loss, a stooped posture and persistent low back pain. Both require reassessment of future fracture risk.

Hip fractures usually result from falls. Osteoporotic bone loss can make even a low-energy fall sufficient to cause a fracture. Inability to walk or bear weight on the affected leg also raises concerns about problems associated with immobility.

• Loss of mobility: Prolonged time in bed may reduce muscle strength and balance.
• General health effects: Prolonged immobility may be associated with lung, circulatory and pressure sore problems.
• Loss of independence: Assistance with daily care, walking aids and home adaptations may be needed.
• Risk of another fall: A similar event may recur if the balance problem present before the fracture is not addressed.

Vertebral fractures do not always cause sudden severe pain. Some are recognised through back pain, a forward stoop or loss of height; others are found incidentally on imaging. Involvement of several vertebrae can impair trunk balance and everyday movements more markedly.

A vertebral fracture is a strong warning of future fractures. The clinician’s guide to prevention and treatment of osteoporosis reports that a single vertebral fracture increases the risk of another vertebral fracture approximately 5-fold, and the risk of hip and other fractures 2–3-fold (PMID 35478046).

New severe low back or hip pain, inability to stand up after a fall or inability to bear weight requires prompt medical assessment. Go to an emergency department if there is leg weakness, numbness or a change in bladder or bowel control.

Surgery may be considered for a hip fracture; the approach to a vertebral fracture depends on its structure and neurological findings. Outcomes of any surgical or interventional procedure may vary between individuals.

How Is an Individual Patient's Fracture Risk Assessed?

Individual fracture risk is assessed by considering bone mineral density, age, previous fractures, likelihood of falls, medication and coexisting conditions together. Tools such as FRAX use these data to help calculate the probability of hip fracture and major osteoporotic fracture over the next 10 years.

Assessment does not rely on bone density alone. The following factors, which can influence bone strength and everyday fall risk, are considered together:

• Bone mineral density: Usually measured by dual-energy X-ray absorptiometry. A T-score of −2.5 or below is considered consistent with osteoporosis.
• Previous fractures: A vertebral, hip or wrist fracture after minor trauma is an important indication of bone fragility.
• Age and general health: Older age, reduced muscle strength, impaired vision or balance problems may increase the likelihood of falls.
• Medicines and conditions: Long-term corticosteroid use and conditions such as rheumatic disease, diabetes and malabsorption may alter risk.
• Family and lifestyle history: A parental hip fracture, smoking and high alcohol consumption are included in assessment.

A FRAX result supports decision-making by indicating the patient's probability over the next 10 years; it is not a diagnosis or treatment decision on its own. The calculated value is interpreted alongside clinical assessment, particularly in people who fall frequently, have had a recent fracture or have certain chronic conditions.

Sources: PMID 37874461 — An overview of the use of the fracture risk assessment tool (FRAX) in osteoporosis (2024); PMID 33830957 — Fracture Risk Assessment: An Update (2021).

How Do Age, Menopause and Oestrogen Loss Affect Fracture Risk?

Bone formation slows with age, while falling oestrogen levels at menopause accelerate bone breakdown and increase fracture risk. When reduced bone mineral density is accompanied by changes in muscle strength, balance, vision and tendency to fall, hip and vertebral fractures in particular may become more frequent.

Oestrogen helps balance the ongoing cycle of bone formation and breakdown. Reduced protection after menopause can affect both the amount of bone and its internal architecture. This may reduce the ability of bone to withstand everyday loads and impacts from falls.

• Age at menopause: Earlier menopause may mean a longer duration of bone loss associated with oestrogen decline.
• Older age: Age-related muscle loss, balance problems and slower reflexes may increase the likelihood of falls.
• Previous fracture: Future fracture risk is assessed separately in a patient with a previous low-energy fracture.
• Coexisting factors: Low body weight, inactivity, inadequate nutrition and certain diseases may compound age-related risk.
• Medication use: Some long-term medicines may affect bone strength or balance.

Considering bone mineral density testing in women aged 65 and over helps identify osteoporosis and fracture risk early. For younger postmenopausal women, testing is decided not by age alone but by considering early menopause, previous fractures, family history and other clinical risk factors together (PMID 35478046 — The clinician’s guide to prevention and treatment of osteoporosis, 2022).

Age or menopause alone does not mean that ‘a fracture will happen’. Two people of the same age may have markedly different risks because of bone mineral density, previous fractures, fall history and general health. Assessment therefore focuses on the person's overall risk profile rather than calendar age alone.

How Do Osteoporosis Treatment and Fall Prevention Reduce Fracture Risk?

Osteoporosis treatment aims to preserve bone strength, while fall-prevention measures aim to reduce the trauma that causes fractures. Medication alone is not considered sufficient to reduce fracture risk; balance and strength exercises, adequate nutrition, vision assessment, home safety and regular clinical follow-up are planned together.

Treatment is chosen according to age, previous osteoporotic fractures, bone mineral density, coexisting conditions and medication. Tools such as FRAX help calculate the probability of hip and major osteoporotic fractures as a 10-year risk. This result does not determine treatment by itself; it is interpreted alongside clinical findings. An overview of the use of the fracture risk assessment tool (FRAX) in osteoporosis (2024), PMID 37874461

A fracture-risk reduction plan generally includes:

• Taking medication regularly: Osteoporosis medicines aim to reduce bone breakdown or support bone formation. The type and duration of treatment depend on the patient's risk profile; treatment is not stopped or changed without medical assessment.
• Strength and balance training: Resistance, weight-bearing and balance exercises matched to the patient's ability may support bone health and help reduce fall risk. The effect of exercise on bone mineral density was assessed in a 2022 systematic review and network meta-analysis. Effect of exercise on bone mineral density among patients with osteoporosis and osteopenia: A systematic review and network meta-analysis (2022), PMID 34725872
• Reducing fall hazards at home: Review slippery rugs, inadequate lighting, unsecured cables and bathroom areas without grab supports. Keeping a clear path around the bed at night is particularly important for older patients.
• Reviewing vision, balance and medication: Conditions causing dizziness, low blood pressure or drowsiness can contribute to falls. A doctor should review all current medicines together in this context.
• Personalised nutritional support: Calcium, protein and vitamin D requirements are considered according to diet, laboratory results and coexisting conditions. Supplements are not products that everyone should start independently at the same dose.

Future fracture risk is specifically addressed in patients who have already had a hip, vertebral or other low-energy fracture. Treating the fracture alone therefore does not complete care; osteoporosis must be investigated, the causes of falls identified and the prevention plan followed up.

How Are Treatment and Recovery Planned After an Osteoporotic Fracture?

Treatment and recovery after an osteoporotic fracture are planned by considering fracture location, age, general health, pain, mobility and future fracture risk together. The aim is not only to heal the fracture, but to restore safe movement, prevent falls and reduce the likelihood of subsequent fractures by organising osteoporosis treatment.

Even two patients with the same diagnosis may need different treatment plans. For example, surgical assessment may be prioritised to enable early mobility in an older patient with a hip fracture, whereas some vertebral fractures can be managed with a brace, pain control and a controlled movement programme.

Planning generally includes the following stages:

• Fracture assessment: X-rays, CT or MRI are used to examine fracture location and pattern and the load-bearing capacity of the bone.
• Choosing treatment: Non-surgical monitoring or surgery is considered according to fracture stability and mobility needs. In osteoporotic bone, the fixation method is also planned according to bone structure.
• Pain and movement management: The effects of prolonged immobility on muscle loss, fall risk and dependence in daily life are considered. The timing of weight-bearing and exercise depends on fracture healing.
• Organising osteoporosis treatment: Bone mineral density, nutritional status, coexisting conditions and medicines are assessed. The relevant doctor addresses medication and calcium and vitamin D requirements when necessary.
• Estimating future fracture risk: Tools such as FRAX help estimate hip and major osteoporotic fracture probability over a 10-year period; the result is interpreted alongside clinical findings, not in isolation. (An overview of the use of the fracture risk assessment tool (FRAX) in osteoporosis, 2024; PMID 37874461.)
• Fall prevention: Balance, safe walking, vision problems, obstacles at home and the need for assistive devices are reviewed.

Recovery is not measured only by fracture union on imaging. The ability to get out of bed, walk safely and resume daily tasks is also monitored. New or increasing back or hip pain, or loss of movement after a fall, requires reassessment.

Outcomes of any surgical or interventional procedure may vary between individuals. Treatment and rehabilitation are planned according to fracture type and general health.

For Which Vertebral Fractures Are Vertebroplasty and Bone Cement Considered?

Vertebroplasty with bone cement may be considered when imaging confirms an osteoporotic vertebral compression fracture, pain corresponds to the fracture level and persists despite non-surgical treatment. Not every vertebral fracture is suitable; the decision depends on fracture age, vertebral wall integrity, nerve compression and general health.

During vertebroplasty, a needle enters the vertebral body under imaging guidance and bone cement called polymethylmethacrylate is injected. The aim is not to restore the collapsed vertebra to its former height, but to provide mechanical support at the fracture. The course and treatment response of osteoporotic vertebral fractures differ between patients (PMID 32967415 — Vertebral compression fractures: Still an unpredictable aspect of osteoporosis, 2021).

The following criteria are assessed together:

• Back pain corresponding to the fracture level identified on examination
• MRI findings suggesting a recent or unhealed fracture
• Pain significantly limiting movement, standing up or daily care
• Persistent functional loss despite the non-surgical treatment plan
• No vertebral wall damage, infection or clotting disorder that could prevent safe bone cement injection

A numerical pain scale from 0–10 may be used for monitoring, but a high score alone is not enough to justify vertebroplasty. Examination and imaging must point to the same vertebral fracture. Widespread low back pain, old healed fractures or pain from another cause may limit the expected benefit of bone cement treatment.

Leg weakness, progressive numbness, sudden deterioration in walking or changes in bladder or bowel control may suggest nerve compression. Do not wait for routine vertebroplasty assessment with these symptoms; urgent medical assessment is needed the same day. Some vertebral fractures compressing nerve tissue may require other surgical techniques.

Risks considered include cement leakage outside the vertebra, infection, bleeding, effects on nerve tissue and new fractures in neighbouring vertebrae. The technique and approach are planned according to the patient's anatomy (PMID 35504777 — Percutaneous curved vertebroplasty for osteoporotic vertebral compression fracture, 2022).

Outcomes of any surgical or interventional procedure may vary between individuals. Vertebroplasty decisions consider examination, imaging, fracture characteristics and general health together, rather than pain level alone.

What Helps Protect Bones in Everyday Life?

Protecting bones in daily life involves regular weight-bearing and strengthening exercise, adequate protein, a doctor-directed calcium and vitamin D plan, and a home environment that reduces fall risk. Reviewing vision, balance, footwear and medication also helps reduce osteoporotic fracture risk.

Maintaining bone health involves more than eating more dairy products. Loading the bones, supporting joints with muscles and reducing environmental fall hazards are parts of the same plan.

• Choose an individual activity programme: Weight-bearing activities such as walking and stair climbing can be complemented by resistance and balance exercises. Muscle-strengthening activities are generally included on at least 2 days a week. In patients with osteoporosis or a previous vertebral fracture, exercise type should be agreed with a physiotherapist or doctor. The effect of exercise on bone mineral density was assessed in a 2022 systematic review and network meta-analysis (PMID 34725872 — Effect of exercise on bone mineral density among patients with osteoporosis and osteopenia: A systematic review and network meta-analysis, 2022).

• Avoid sudden, uncontrolled movements: Movements that force the back into forward bending, rotate the trunk rapidly or increase fall risk may be unsuitable, particularly for people at risk of vertebral fractures. This does not mean stopping all movement; it means choosing safe ways to move.

• Do not base nutrition on a single product: Protein, calcium and vitamin D requirements are assessed according to age, diet, kidney function and medication. Supplements should not be started indiscriminately; deficiency, daily intake and coexisting conditions should be considered together.

• Reduce fall hazards at home: Secure slipping or curling rugs, keep routes clear, light stairs and consider grab supports in the bathroom. Even a few metres of dark space between the bed and bathroom at night can increase an older person's fall risk.

• Footwear and aids should be functional: Choose shoes that hold the foot securely and have non-slip soles. If using a walking stick or frame, check its height and how it is used; an incorrectly adjusted aid may impair rather than improve balance.

• Review vision, hearing and medicines regularly: Medicines causing dizziness, drowsiness or low blood pressure may be associated with falls. Do not decide independently to stop medication; all medicines should be reviewed with the relevant doctor.

New low back pain, loss of height, a marked stoop or hip and groin pain after a minor fall may suggest an osteoporotic fracture. In this situation, medical assessment is important rather than waiting for the pain to resolve.

Frequently asked questions

Osteoporosis reduces bone strength, increasing the likelihood of fractures from low-energy trauma. Hip and spinal fractures can have serious consequences; however, risk does not depend solely on bone mineral density. Age, previous fractures, history of falls, medication use and coexisting conditions must be assessed together.

What is an osteoporotic fracture?

An osteoporotic fracture is a fracture that can occur following low-energy trauma, such as a fall from standing height, because bone strength has decreased. The hip, spine, wrist and shoulder region are commonly affected. Some spinal fractures may develop without an obvious fall.

What happens if osteoporosis progresses?

As osteoporosis progresses, bone fragility and the associated fracture risk may increase. Spinal fractures can cause loss of height, a hunched posture and lower back pain, while a hip fracture can lead to loss of mobility and a lengthy recovery. A previous osteoporosis-related fracture is also a finding that requires assessment of the risk of further fractures.

Why do bones fracture more easily in older age?

The increased fracture risk in older age results from changes in bone density and structure combined with the likelihood of falling. Reduced muscle strength, balance or vision problems, certain medications and coexisting conditions can also influence the risk. In women, the fall in oestrogen levels after menopause may accelerate bone loss.

What can be done to prevent osteoporosis?

Although osteoporosis cannot always be completely prevented, bone loss and the risk of fall-related fractures can be reduced. Resistance and balance exercises suited to age and health, adequate protein and calcium intake, assessment of vitamin D status, avoiding smoking and addressing fall hazards at home are important. Individual risk should be assessed alongside age, previous fractures, bone mineral density and other clinical factors.

Does osteoporosis cause lower back pain?

Osteoporosis itself usually causes no pain; lower back pain may be a sign of a vertebral compression fracture. Sudden pain, loss of height or forward curvature of the back requires assessment for spinal fractures. Because lower back pain can also arise from muscles, discs and joints, a diagnosis cannot be made from symptoms alone.

Does everyone diagnosed with osteoporosis need medication?

The same drug treatment is not appropriate for everyone diagnosed with osteoporosis. Treatment decisions are made by considering bone mineral density, previous fractures, age, fall risk, coexisting conditions and estimated fracture risk together. Medication should not be started, changed or stopped without a doctor's assessment.

Which symptoms of an osteoporosis-related fracture require emergency assessment?

If a fall is followed by severe hip or leg pain, inability to stand, limb deformity or suspected head or neck injury, call 112 or attend an emergency department. New lower or upper back pain accompanied by leg weakness, numbness or changes in bladder or bowel control requires emergency assessment. Persistent pain and restricted movement after trauma should be reported to a healthcare facility on the same day; this information does not replace a medical diagnosis.