Bone on Bone Does Not Mean What You Think It Means

She had not been up the Dune Climb in two years.

Not because it hurt too much. Because a doctor had held up an x-ray in 2024, pointed at a narrow gap on the left, and said the words. Bone on bone. She heard them the way most people hear them, as a warning label. Any more walking and you are grinding away what is left.

So she stopped. And in two years of stopping, she lost strength she is now going to have to earn back, and the hip got worse, not better.

I want to take those three words apart, because I think they have done more damage in Northern Michigan than most of the injuries I treat. That is a strong claim and I mean it.

What the x-ray is actually showing

The gap you see between the ball and the socket on an x-ray is not cartilage. Cartilage does not show up on film. That gap is a shadow, the space where cartilage used to be, and radiologists measure it in millimeters to estimate how much wear has happened.

"Bone on bone" is shorthand for "that space is very narrow." It is a description of a picture. It is not a description of your afternoon.

And here is where it gets interesting.

The x-ray and the pain do not line up

In 2015 the BMJ published a study looking at exactly this question. The researchers pulled from two large groups of people. One was the Framingham Osteoarthritis Study, 946 participants from a community in Massachusetts, recruited whether or not they had any symptoms. The other was the Osteoarthritis Initiative, 4,366 people from a multicenter study across the United States.

Everybody got hip x-rays. Everybody was asked, using a picture of the hip joint so there was no confusion about location, whether they had hip pain on most days.

Then the researchers compared the two.

In the Framingham group, only 15.6% of hips in people with frequent hip pain showed arthritis on the x-ray. Flip it around: only 20.7% of hips that looked arthritic on the x-ray were frequently painful.

In the larger national group the numbers were even further apart. Just 9.1% of hips in people with frequent pain showed radiographic arthritis, and 23.8% of arthritic-looking hips actually hurt.

Sit with that. In the bigger cohort, more than nine out of ten frequently painful hips did not have arthritis visible on the film. And roughly three out of four hips that looked bad on the film were not causing frequent pain.

The same paper noted that in the Framingham community, radiographic hip arthritis showed up in about 19.6% of people, while symptomatic hip arthritis was down around 4.2%.

Plenty of people are walking around Traverse City right now with hips that would look alarming on film and feel fine on the TART.

So what is the x-ray good for

Do not throw it out. It is real information. If you are heading toward a hip replacement, the surgeon needs that picture, and joint space narrowing does track with who eventually ends up in the operating room.

What it is not is an explanation of your pain, and it is definitely not a prognosis.

The BMJ authors were making a narrower point than the one people take from it. They were testing the x-ray as a diagnostic test for hip pain, and as a diagnostic test it performed poorly in both directions. That is all. It does not mean arthritis is imaginary or that imaging is useless.

It means the film and the symptom are two different things, and treating one as proof of the other leads people to conclusions that hurt them.

Why this one matters so much

Because of what happens after somebody hears it.

I see the pattern almost weekly. Someone is told bone on bone, and within a month they have quit the walking group, sold the kayak, started taking the stairs sideways, and told their kids they cannot do the trip. The hip did not do that. The sentence did.

Then six months of not loading the leg does its own work. The glutes get weak. Balance drops. The other hip and the low back start picking up slack they were not designed for. Now there are three problems where there was one, and the x-ray has not changed at all.

This is the part I would want a friend to understand. In a body, the loud spot is usually the one that gave in, not the one that failed first. The hip that hurts on the film is often the link that absorbed years of an ankle that stopped bending, or a mid-back that stopped turning, or an opposite leg that quietly stopped doing its share. Take the picture as the beginning of a question rather than the end of one.

Cartilage does not wear out like a brake pad. Joints are living tissue and they are healthier under regular, tolerable load than under none. The research on exercise for hip arthritis is consistent on this point even in people with clear joint space narrowing.

What to do about it

If you have been told you are bone on bone, here is what I would do with that information. You may weigh it differently, and that is fine.

• Ask a follow-up question. "Does the x-ray explain my symptoms, or is it just what my hip looks like?" A good doctor will not be annoyed by that. Many will tell you the two do not always match.
• Find out where the pain actually is. Groin and front-of-thigh pain behaves differently than pain on the outside of the hip or in the buttock. The outside-of-the-hip stuff is very often tendon or muscle related and responds well to loading, and it gets mistaken for arthritis constantly.
• Get a movement exam, not just a picture. How much internal rotation do you have. How long can you stand on that leg. How does your ankle move on that side. None of that is on the film and all of it is changeable.
• Keep loading the hip in the range you have. Sit-to-stands, step-ups, hills. Pain that settles within a day is not damage.

Two things that do need a doctor and not a home program: pain that wakes you every single night regardless of position, and hip or groin pain after a fall in someone with thinning bones. Those get looked at.

The bottom line

You were handed a photograph and told it was a forecast.

The people in those two studies were living proof that the photograph and the forecast are different documents. Most hips that hurt looked normal. Most hips that looked bad did not hurt.

Your hip might genuinely need replacing someday, and if that is where this goes, nobody here will think you failed at anything. But that decision belongs to how you are living, not to a shadow on a film.

So what have you stopped doing since you heard those words? That is the question I would start with, not the x-ray.

If you were told you are bone on bone and it quietly took things away from you, let us take an actual look. The first visit is a free 20-minute movement assessment. Twenty minutes, in clinic, and you leave knowing what your hip can and cannot do right now. We look at the whole chain rather than the joint on the film, which is a way of working called Applied Functional Science. Every therapist in this building is certified in it through the Gray Institute. No charge, no insurance, no pressure to schedule anything after. Call the West Front St office at (231) 944-6541.

My book on hip replacement recovery is free at thesuperiortherapy.com if you want it.