Lifting protects the hip, and in one trial creatine protected it more

Here is the uncomfortable arithmetic of bone after menopause. Exercise helps. Everybody says so, and it is true. But when researchers actually measure what a year of hard training does to bone mineral density at the hip or the spine, the honest answer is that it moves by about one to two percent.

One to two percent. After a year. That is not nothing, and it is a great deal better than the direction bone travels when you leave it alone. But it is a thin margin, and anybody who has watched a mother or a patient go through a hip fracture knows the stakes do not feel thin at all.

So a group in Saskatchewan asked a simple question. If the limiting factor is how hard the muscle can pull on the bone, what happens if you make the muscle work better while it pulls?

What they actually did

This was not a survey and not a guess. It was a double blind randomized controlled trial run across two universities for twelve months, which is a long time to keep anybody doing anything.

Forty-seven postmenopausal women, average age 57, were randomly assigned to one of two groups. Both groups did exactly the same supervised resistance training, three days a week, all year. Three sets of ten repetitions to fatigue, at around eighty percent of maximum for the big lifts, with the weight increased as they got stronger.

One group also took creatine monohydrate at 0.1 grams per kilogram of body weight per day. On training days they split it, half immediately before the session and half immediately after. On the other days they took it with two meals. The second group got corn starch maltodextrin that looked and mixed identically. Nobody, including the people running the tests, knew who was on what.

Thirty-three of them finished and were analysed at twelve months. Hold on to that number, because it matters later.

The hip did something

Both groups lost bone at the femoral neck, which is the narrow part at the top of the thigh bone and the piece that breaks in a hip fracture. That is what postmenopausal bone does, and a year of lifting did not reverse it in either group.

But the rate was different. The placebo group lost 3.9 percent. The creatine group lost 1.2 percent.

Look carefully at those confidence intervals, because they say something the headline number does not. The placebo group's interval sits entirely on the losing side. The creatine group's interval crosses zero, meaning the data are consistent with a small loss, no change, or even a very slight gain. That is a meaningfully different picture, and it is why the authors argue their result approaches the size considered clinically relevant for preventing fracture.

And the shape of the bone changed too

The second finding is the one that matters most from a physiotherapy point of view, because it is not about density at all.

They measured the subperiosteal width of the femoral shaft, which is simply how wide the outer surface of the bone is. Width matters out of proportion to its size, because a wider tube resists bending far better than a narrow one of the same material. It is why scaffolding poles are hollow and wide rather than solid and thin.

The creatine group's femoral shaft got 0.04 cm wider. The placebo group's got 0.12 cm narrower.

Density is what the scan reports. Whether the bone bends or breaks depends on how that material is arranged, and those are not the same question.

They also got noticeably stronger on the bench press, 64 percent against 34 percent in relative terms. Which is roughly what you would expect if creatine is doing what creatine is understood to do, letting you complete more hard work over a year of training.

Now the part most articles leave out

Everything else they measured showed no difference between the groups. Not the lumbar spine. Not the total hip. Not whole body bone density, not the speed of sound measurements at wrist and shin, not lean tissue mass, not muscle thickness, not hack squat strength.

That is a lot of nothing, and it deserves saying plainly rather than being buried under the two findings that worked.

The spine result is especially worth sitting with, because the spine was originally registered as the study's primary outcome. The researchers expected it to be the site that responded best. It did not respond at all. When they worked out afterwards how many women they would have needed to detect a spine difference of the size they saw, the answer was two hundred per group. They had fewer than twenty.

How much to trust this

The authors are unusually straight about their own study, and their caution is worth repeating rather than sanding off.

What that adds up to is a genuine signal in a small trial, pointing somewhere worth investigating, rather than a settled fact. One good study is a reason to pay attention. It is not a reason to reorganize anybody's cupboard.

On safety, which is usually the first question anybody asks about creatine and kidneys, this trial checked. Liver enzymes showed no difference between the groups, and creatinine clearance stayed normal in the creatine group across the whole twelve months. Every adverse event recorded was rated mild or moderate.

What we take from it in practice

The finding worth carrying out of this paper is not the powder. It is the training.

Both groups lifted three times a week for a year, and both were measured at eighty percent of their maximum on the big lifts. That is real training, not a resistance band and a cheerful pamphlet. The creatine question only exists because that foundation was in place for everybody in the study. Nothing here suggests a supplement does anything for a bone that is never loaded.

So the order matters, and it does not change:

• Load the bone properly first. Progressive resistance training, heavy enough to be hard, often enough to count, sustained long enough to matter. Twelve months, in this trial. Not six weeks.
• Understand that the hip and the spine behave differently. They responded differently here, and a plan that assumes one number covers the whole skeleton is not really a plan.
• Treat any supplement as a question for your doctor, not a decision made in a shop. Creatine has a good safety record in trials like this one, but you have your own kidneys, your own medications and your own history, and none of those were in this study.

There is a reason this paper is worth the attention. Bone density after menopause is the thing women are told to worry about and given very little to actually do about, beyond a calcium tablet and some vague encouragement to stay active. What the hormonal side of that picture looks like, including what hormone therapy does and does not do to bone, is covered in Dr de Windt's write-up on menopause and bone. Meanwhile the intervention with the best evidence, lifting something heavy on a schedule, is the one that most women over sixty have never been properly taught and are often quietly discouraged from.

Which is why the most useful result in this trial is not the one in the title. Forty-seven postmenopausal women, average age 57, trained hard three days a week for twelve months under supervision, at eighty percent of their maximum on the big lifts, and the recorded adverse events were mild to moderate. They got substantially stronger doing it.

That part was true in both groups. Linda is in the 70+ division at CrossFit and has been lifting since 2016, which is the same argument made with a longer run-up.