Summary: The Bones Beneath
Osteoporosis, Arthritis, and the Infrastructure of Independence
Janet is 71 and broke her wrist catching herself on a kitchen counter. The DEXA scan that followed changed her life: a T-score of negative 3.2, severe osteoporosis. The bones had been failing for years without symptoms, without anyone checking. Her doctor had never ordered a bone density test.
Roughly 69% of Americans with osteoporosis do not know they have it. The disease produces no pain, no warnings until something breaks. By age 70, a woman may have lost 30 to 40% of her peak bone density. More than half the population over 50 has either osteoporosis or low bone mass. Yet fewer than 25% of women for whom screening is recommended actually receive it. Among men, nearly 87% with osteoporosis go undiagnosed.
Bone does not erode in isolation. Muscle declines alongside it. Sarcopenia, age-related muscle loss, affects 10 to 16% of older adults, climbing to 50% after 80. After age 50, muscle mass decreases 1 to 2% per year and strength drops faster: 3% per year after 60. Muscle contraction stimulates bone formation, so when muscles weaken, bone weakens in turn. A person who stops moving is losing both simultaneously, each loss compounding the other.
Osteoarthritis, affecting about 37% of Americans over 60, reshapes daily life in ways that cascade through every other system. Pain reduces mobility. Immobility accelerates bone loss, muscle wasting, cardiovascular decline, and weight gain. One-third of adults with arthritis over 45 meet criteria for depression or anxiety.
Treatments for osteoporosis work but are underused. Bisphosphonates reduce fracture risk by 30 to 50%. Newer agents like denosumab and romosozumab offer stronger bone-building effects. Joint replacement remains one of the most successful procedures in modern medicine, with 90% patient satisfaction. The pipeline holds promise for sarcopenia, but no drug is yet approved. Resistance training remains the only proven intervention for muscle preservation.
Ask about a DEXA scan if you are a woman over 65 or a man over 70. If you have already had a fracture, ask whether your bone density has been checked. The bones beneath cannot speak for themselves.