Hip dysplasia describes an abnormally shaped hip joint — usually a socket that’s too shallow for the ball. The abnormality develops in childhood, but if it isn’t detected, it can present in young adults as activity-related hip pain. So what is hip dysplasia in adults, and what should you do about it in the UK? 

hip dysplasia

What is hip dysplasia in adults? 

Hip dysplasia is poor containment of the ball within the socket. When the ball or socket doesn’t develop properly in childhood, the two don’t fit together well. Excess movement then occurs between them, producing shearing forces and, over time, damage.

Up to 50% of adults with hip dysplasia also have hypermobility — looser-than-average ligaments and joint capsule. These more flexible structures allow even more movement of the ball within the socket.

The extra movement loads the joint abnormally. Left unchecked, those forces lead to pain, reduced function, and early arthritis. Think of a car tyre: if the wheel isn’t aligned properly, the tyre wears down prematurely.

Symptoms of hip dysplasia in adults

People usually notice intermittent pain with activity, around the hip or groin — though it can also be felt in the buttock, thigh, or knee. The pain typically eases with rest. More severe symptoms include clicking or catching, limping, or a feeling that the hip might give way.

One of the challenges is that symptoms vary from person to person, and hip dysplasia often masquerades as simply “tight muscles”. As a result, most cases aren’t diagnosed until late — by which point more damage has been done to the joint.

How is hip dysplasia in adults diagnosed?

hip dysplasia

A plain X-ray is usually all that’s needed to diagnose hip dysplasia. We measure specific angles to assess how well the socket covers the ball:

  • The lateral centre-edge angle — less than 18 degrees indicates significant dysplasia.
  • The sourcil (acetabular) angle — greater than 10 degrees means poorer coverage and significant dysplasia.

A 3T MRI is often added to image the soft tissues — the hip cartilage and the labrum. Importantly, a labral tear on the scan doesn’t automatically mean you need surgery.

Many cases are borderline, and these are frequently missed by clinicians who aren’t specifically looking for the condition. Getting the diagnosis right is the single most important step. 

Treatment options for hip dysplasia in adults

There are two broad approaches for the treatment of acetabular dysplasia: conservative and surgical.

Physiotherapy

Physiotherapy addresses poor posture, muscle weakness, reduced joint awareness, and any associated tendon inflammation. A programme typically strengthens the hip extensors and external rotators, re-educates the walking pattern, and improves body awareness of the joint’s position.

Activity modification

Reducing the sports that aggravate the hip — particularly change-of-direction sports — often helps. Weight management, a healthy lifestyle, and cross-training (swimming, for example, though avoiding breaststroke) all reduce the load on the joint.

Injections

A cortisone injection into the joint can reduce pain and inflammation for a period of time. It also serves a diagnostic purpose: if the injection relieves the pain, it confirms that the pain is coming from the joint itself rather than from the surrounding structures.

Surgery

Where conservative treatment fails, surgeons may recommend surgery. The gold-standard procedure is a peri-acetabular osteotomy (PAO) — repositioning the socket over the ball and fixing it with screws while the bone heals. It’s usually recommended for people with dysplasia before arthritis has developed; once arthritis is established, it’s often too late.

PAO aims to delay arthritis — by up to 20 years in some studies — but it’s a major undertaking, with rehabilitation taking at least a year. Keyhole surgery isn’t usually advised for dysplasia (unlike for hip impingement).

Frequently asked questions about acetabular dysplasia in adults

Can hip dysplasia be missed in childhood and only appear in adulthood?

Yes — this is common. Milder or borderline dysplasia often isn’t detected as a child and only causes symptoms in young adulthood, typically as activity-related hip or groin pain. Because it can masquerade as “tight muscles”, it’s frequently missed even then, which is why specific assessment matters.

Is hip dysplasia the same as hip impingement?

No — in some ways they’re opposites. Dysplasia is too little coverage of the ball by the socket; hip impingement (FAI) is too much, or an abnormally shaped ball or rim. They can coexist, and telling them apart matters because the treatments differ — keyhole surgery suits impingement, whereas dysplasia usually needs a PAO.

Does a labral tear on my scan mean I need surgery?

Not on its own. Labral tears are common and often found on scans of people whose pain is being driven by the underlying dysplasia. Treating the tear without addressing the dysplasia misses the real problem — which is why the diagnosis, not just the scan finding, guides treatment.

Can acetabular dysplasia be treated without surgery?

Milder cases are often managed with physiotherapy, activity modification, and sometimes an injection — particularly where arthritis is limiting the surgical options. Surgery (PAO) is considered for significant dysplasia in a younger person before arthritis develops, because that’s when it can most change the long-term outlook.

Will hip dysplasia lead to arthritis?

Untreated significant dysplasia is a well-recognised cause of early hip arthritis due to abnormal joint loading. Diagnosing and addressing it early — before arthritis sets in — is the best way to protect the joint.

Final word from Sport Doctor London about hip dysplasia in adults

Acetabular dysplasia is an important and under-recognised cause of hip pain in young adults, and a preventable cause of early arthritis. The most crucial part of managing it is getting the diagnosis right — and early. Dr Masci works with experts in hip dysplasia, so you’ll see the right person at the right time.

If you have persistent hip or groin pain, Dr Masci can assess you in London, including the right imaging. Contact the team here or call +44 (0) 203 488 0350.

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