Understanding Osteoporosis: What It Is, Who It Affects, and When a Bone Density Scan Is Worth Considering

Osteoporosis develops silently over decades. Learn what it is, why it develops, who is most at risk, and how bone density is measured.

9 September 2026 · 5 min read

Osteoporosis is a skeletal condition where bone mineral density falls low enough that bones fracture under forces healthy bone would absorb, diagnosed when a DEXA scan T-score reaches -2.5 or below. Most people learn they have it only after a fracture, because the condition produces no symptoms during the years it progresses.

Prevalence and context in Singapore

Between 35.7% and 59% of Singapore adults aged 60 and above have osteoporosis, and national hip fractures nearly doubled from 1,487 to 2,729 per year between 2000 and 2017. The 2025 Singapore consensus on osteoporosis management puts prevalence among women aged 45 to 69 at 6.8%, with 8.5% among all adult men. Hip fracture incidence among residents aged 45 and older is 611 per 100,000 person-years, climbing to 1,369 per 100,000 for women aged 75+.

A hip fracture can be life-altering—nearly a third of individuals lose significant independence afterward, and up to 20% do not survive the following year. Singapore's fracture rates among women over 50 are among the highest in Asia, approaching those of the US and Europe.

Several factors contribute locally. Smaller Asian skeletal frames carry lower absolute bone mass. Singapore's indoor-dominant lifestyle limits sun exposure, driving widespread Vitamin D insufficiency: the Ministry of Health reports 40% of Singaporeans are Vitamin D deficient, with 8% severely so. Sedentary work culture and low dietary calcium intake add further risk.

How bones change across a lifetime

Bone density peaks between ages 20 and 25, remains relatively stable through the thirties, then enters a gradual age-related decline that accelerates sharply in women during menopause and more slowly in men from around age 70. Around 90% of adult bone mass is accumulated by ages 18 to 21 in women and 20 to 23 in men, so peak bone mass acts as a structural reserve for later life.

In women, oestrogen directly regulates bone remodelling. As it declines during menopause, bone resorption accelerates significantly, with women losing up to 2% to 3% of total bone mass annually during the early post-menopausal years. In men, bone loss progresses more gradually as testosterone levels decline, though risk rises sharply past age 70.

What causes osteoporosis

Osteoporosis is caused by sustained imbalance between bone resorption and bone formation, driven by sex hormone decline, chronic calcium or Vitamin D insufficiency, physical inactivity, genetic factors, and certain medications.

Heritable factors account for 60% to 80% of peak bone mass variation, which is why family history matters. Calcium provides the mineral building blocks for bone, while Vitamin D is required for intestinal calcium absorption. Chronic shortfalls force the body to leach calcium from the skeleton to maintain stable blood levels, weakening bone from within. Weight-bearing exercise generates mechanical strain that signals new bone formation; prolonged inactivity does the opposite. Chronic smoking and high alcohol intake directly impair bone cell function and calcium metabolism. Prolonged corticosteroid use, hyperthyroidism, coeliac disease, inflammatory bowel disease, and chronic kidney disease can also accelerate bone loss independently.

Who is at higher risk

Post-menopausal women are at highest risk, particularly those with early menopause at or before age 45, along with individuals who have a small frame or low BMI (<18.5 kg/m²), a family history of hip fracture, or prolonged corticosteroid use.

The 2025 Singapore consensus specifically identifies Chinese ethnicity, low BMI, chronic joint pain, and weak muscle strength as locally relevant risk factors. In younger adults, prolonged amenorrhoea, long-term steroid use, and certain hormonal conditions can cause significant bone loss well before middle age.

Symptoms and signs to be aware of

Osteoporosis produces no symptoms until a fracture occurs. Bone density can fall substantially without pain, stiffness, or any outward signal, which is why it is often called a silent condition.

The signs that do emerge appear late: a gradual loss of height (2 cm or more over time), a stooped or rounded upper back (kyphosis), and fractures from low-impact events such as a minor fall, bending, or coughing. The most common fracture sites are the wrist, hip, and spine. Spinal compression fractures can occur without a person realising, accumulating silently and contributing to height loss.

How bone health is measured

Bone health is primarily measured using a DEXA scan (dual-energy X-ray absorptiometry), which quantifies bone mineral density at the hip and lumbar spine and expresses the result as a T-score compared to the peak bone mass of a healthy young adult. The WHO classification:

• T-score of -1.0 and above: normal bone density
• T-score between -1.0 and -2.5: osteopenia (lower than normal, but not yet osteoporosis)
• T-score of -2.5 or below: osteoporosis

Approximately half of fragility fractures in postmenopausal women occur at the osteopenia stage, not at established osteoporosis, which is why the intermediate range matters clinically.

Doctors may also assess Vitamin D (25-OH), calcium, and in some cases parathyroid hormone (PTH) and bone turnover markers such as P1NP and CTX. In Singapore, a DEXA scan requires a doctor's referral.

Genie's Health Locker stores DEXA T-scores, Vitamin D, and calcium results in one place over years. Ask Genie contextualises these markers against your age, sex, and life stage, helping you and your doctor track change across time.

When a bone density scan might be worth considering

Singapore guidelines recommend DEXA screening for postmenopausal women and men aged 60 and above with risk factors, and for anyone who has experienced a low-impact fracture after age 50. Earlier screening is also considered for those on prolonged corticosteroids, with early menopause, or with conditions that affect bone metabolism.

Talking to your doctor about bone health

If you have risk factors, or are approaching or past menopause, raise bone health with your doctor. Mention family history of hip fractures, medications that may affect bone density, and whether you have noticed height loss.

Consider asking:

• "Given my age and risk factors, would a DEXA scan be appropriate?"
• "My Vitamin D was tested previously. How does it track with my overall bone health picture?"
• "If my T-score shows osteopenia, what does follow-up look like?"

Read Next: How Often Do You Need a Health Screening?

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