Bones [01] Bone Density is a helpful term for understanding bone density, a recognized indicator of the amount of mineral in bone tissue. Bone density is not constant throughout life, and low bone density may make someone more vulnerable to fracture. But a bone density number doesn't paint the whole picture of skeletal health.
This guide details how bone mineral density is measured, what DXA results and T-scores mean, nutrients and exercises that support bone health, and key caveats to remember. It also addresses common questions about a 1.7 result and if it’s good, which vitamin is most important, what is a concerning bone-density score, and if a T-score can get better.
Bones [01] Bone density is the amount of minerals, especially calcium and phosphorus, in bone tissue. Dense bone usually provides more structural support. Decreased bone mineral density to a significant degree may lead to predisposition to fractures. Bone is living tissue that is constantly being restructured as old bone is taken away and new bone is formed.
The most common clinical measurement is a Dual-energy X-ray absorptiometry (DXA) scan. The hip and spine are common sites of assessment of fracture risk, often assessed with the central DXA. The test is fast, noninvasive and has a relatively low level of radiation. Bone density measurements can be used to identify osteoporosis, to detect density that is below normal, and to track changes that occur during treatment.
Bones [01] Don't confuse Bone Density with general bone health. Bone strength is also affected by other factors, including bone structure and turnover, geometry, falls, muscle strength, medications, age, and medical conditions. As such, a single number should be interpreted in the light of an individual’s overall fracture risk, and not as a complete picture of skeletal health.
Bones [01] Bone Density is shaped by the balance between bone formation and bone resorption that is underway. Specialized cells break down older bone while other cells form new tissue. Bone formation during childhood and early adulthood usually outpaces bone loss and bone mass accumulates. As we age, this balance can be moved toward losing more bone, especially after menopause and with other conditions that affect hormone levels or bone metabolism.
A DXA scan produces a measurement of bone mineral density and routinely records a T-score and, when appropriate, a Z-score. The T-score compares the measured bone density with the average density of a healthy young-adult reference population. It is intended for post-menopausal women and men 50 years and older. Generally a T-score of -1 or higher is described as normal. A score from -1 to -2.5 is osteopenia, and a score of -2.5 or lower is in the osteoporosis range.
Bones [01] The testing site, equipment, position and normal variability in the measurement may also change the Bone Density results. In younger adults, premenopausal women, and children, clinicians more often prioritize the Z-score, which compares bone density to an age- and sex-matched reference population. That's why you can't just look at one number when you're reviewing a report.
Healthy Bones [01] Bone Density helps to maintain the mineralized framework to support the body and protect organs. Adequate bone density is connected to increased skeletal tissue and may be associated with diminished fracture risk. Healthy bones also work together with muscles to help support movement, posture and physical activity.
Weight-bearing and resistance exercise may promote aspects of skeletal health. Brisk walking, climbing stairs, dancing, resistance band exercises and strength training apply appropriate mechanical stress to bones. Exercise can also improve muscle strength and balance, which can help lower the risk of falling. However, those with osteoporosis or a history of fractures may need an individualized exercise program, as some high-impact movements can increase the risk of injury.
Normal bone maintenance depends on adequate calcium, vitamin D, protein and overall nutrition. Calcium is an important structural mineral and vitamin D aids the body in absorbing calcium. Good nutrition is good, but more than the recommended amount of supplements will not give you stronger bones and may even have the opposite effect.
It could also mean addressing factors that speed up bone loss to keep bone density healthy. Smoking, heavy alcohol use, prolonged inactivity, some medications, hormonal changes, and some medical conditions can all affect skeletal health. While it may be important to address a particular underlying factor, not all causes of low density can be improved by lifestyle measures alone.
Bones [01] Bone Density is not a treatment or medication and it has no negative effects. The risk, if any, would result from how the bone density is measured or treated. A DXA scan is a small-dose x-ray, and the body is exposed to a small amount of radiation. Peripheral screening devices may be useful in some settings but do not necessarily provide the same diagnostic information as central DXA of the hip and spine.
Supplements also need to be taken in suitable amounts. Some people can have digestive symptoms such as constipation with calcium supplements and too much calcium can be problematic for some people. Vitamin D supplements are useful when diet or blood levels are low, but too much can lead to vitamin D toxicity and elevated calcium levels. Therefore, by default, supplements should be a supplement to a well-rounded diet, not a alternative to a balanced diet.
In the right patients, prescription drugs for osteoporosis can considerably lower the risk of fracture, but each drug has its own potential side effects and contraindications. The decision to treat is based on bone density, history of fractures, age and other risk factors and medical conditions. However, a lower T-sc