Most people don't think about their bones until something goes wrong. A stress fracture. A broken wrist from a fall. A diagnosis of osteoporosis that arrives, seemingly out of nowhere, at a routine checkup.
By the time any of those things happen, the bone health story has been written over decades. The good news is that bone is living tissue — it responds to the right inputs throughout life, and there is almost always something meaningful that can be done, regardless of age or starting point.
October is Bone and Joint Health National Awareness Month, which makes it a timely moment to understand what actually drives bone health, what threatens it, and what physical therapy has to do with any of it.
Bone Is Not Static
The most important thing to understand about bone is that it is constantly being broken down and rebuilt. This process — called bone remodeling — is how bone responds to mechanical load, repairs microdamage, and maintains its structural integrity throughout life.
During childhood and adolescence, bone formation outpaces bone resorption, and bone density increases. Peak bone mass is typically reached in the late 20s to early 30s. After that, the balance gradually shifts — resorption begins to outpace formation, and bone density slowly declines.
This decline is normal. What varies enormously between individuals is the rate of decline — and that rate is significantly influenced by factors that are within our control.
What Threatens Bone Health
Physical inactivity. Bone responds to mechanical load — specifically, to the impact and muscle-pull forces generated by weight-bearing activity. Bone that isn't regularly loaded loses density. This is one of the most well-established relationships in musculoskeletal physiology, and it means that sedentary adults are at significantly higher risk for bone density loss than active ones.
Low energy availability. As covered in our post on RED-S, chronic underfueling — whether intentional or inadvertent — suppresses the hormonal environment that supports bone remodeling. This is particularly relevant for athletes, who may be training hard while unintentionally under-eating, creating a bone health deficit despite high levels of physical activity.
Hormonal changes. The post-menopausal decline in estrogen significantly accelerates bone resorption in women. This is one of the primary reasons osteoporosis is more common in women than men, and why the decade following menopause is a critical window for bone health intervention. Lower testosterone in men similarly affects bone density, though typically later and more gradually.
Vitamin D and calcium insufficiency. Bone mineral density depends on adequate calcium, and calcium absorption depends on adequate vitamin D. Both deficiencies are common in adults, particularly in fall and winter when sun exposure — the primary driver of vitamin D synthesis — decreases.
Certain medications. Long-term corticosteroid use, some cancer treatments, and several other medications directly affect bone density. Patients on these medications deserve proactive bone health monitoring and intervention.
What Protects and Builds Bone
Weight-bearing exercise. Walking, running, hiking, tennis, dancing — any activity that loads the skeleton through impact and ground reaction forces stimulates bone formation. This is one of the reasons running, despite its injury reputation, is generally protective of bone density compared to non-weight-bearing activities like swimming or cycling.
Resistance training. The muscle contractions involved in strength training pull on bone, stimulating remodeling. Heavy resistance training is one of the most potent bone-building stimuli available to adults, and its effects persist into old age. For postmenopausal women in particular, progressive resistance training is a first-line intervention for bone health — not a nice-to-have addition.
Impact loading. Research increasingly supports the role of higher-impact activities — jumping, hopping, skipping — in stimulating bone density, particularly at sites like the hip and spine that are most vulnerable to osteoporotic fracture. This doesn't mean everyone should be doing box jumps, but it does mean that appropriate impact loading, calibrated to the individual's capacity, has a role in bone health programming.
Adequate nutrition. Calcium and vitamin D are the most discussed nutrients for bone health, but the picture is broader — protein, vitamin K2, and magnesium all play roles in bone metabolism. For most adults eating a varied diet, supplementation beyond vitamin D in low-sun months is not typically necessary, but deficiencies are worth screening for.
Where Physical Therapy Fits
PT's role in bone health operates at several levels.
For patients who have already sustained a fragility fracture — a fracture that occurs with minimal trauma, the hallmark of osteoporosis — rehabilitation addresses the immediate physical consequences and builds the strength and balance that reduce the risk of the next fracture.
For patients identified as high-risk through bone density scanning — DEXA scans are the standard tool — PT can design and supervise the exercise programming that is most appropriate for their specific bone density profile, comorbidities, and physical capacity.
For active adults who haven't yet had a fracture or a diagnosis, a movement assessment can identify the gaps in their current activity that may be leaving bone health on the table — and fill them in before the consequences arrive.
At Aureum Physio, bone health is part of how we think about the whole patient, not just the presenting injury. For patients who are at or past midlife, it's a conversation worth having — because the investments made now have consequences that show up decades later.
If you haven't thought about your bone health recently, October is as good a time as any to start. Come in and let's talk about what your current activity is doing for your skeleton — and what it isn't.
