If your vet says they felt a “click” in your dog’s hip, that click has a name — and it tells them a lot.

The Ortolani test is one of the most useful tools a vet has for detecting hip laxity in dogs before arthritis has fully taken hold. It is a hands-on physical exam — no imaging required — that can reveal whether the hip joint is loose enough to be a concern. If you have a large-breed puppy or a dog showing rear-end weakness, understanding what this test is and what the results mean can help you have a much more informed conversation with your vet.

Quick answer: The Ortolani test is a manual orthopedic exam that vets use to detect hip laxity — looseness in the hip joint — in dogs. With the dog on its back under sedation, the vet applies pressure to the femur and then rotates it outward; a palpable "click" or "clunk" as the femoral head slips back into the socket is called a positive Ortolani sign and indicates significant hip laxity consistent with hip dysplasia. A positive result is not a final diagnosis on its own, but it typically leads to X-rays and further evaluation. The test is most reliable in young dogs and less useful once chronic joint changes have made the hip too stiff to reduce.

What Exactly Is the Ortolani Test?

The Ortolani test is a hands-on orthopedic maneuver that checks whether a dog’s femoral head — the “ball” in the hip’s ball-and-socket joint — can be subluxated (partially displaced) and then reduced (popped back in) with controlled movement. The test was originally developed in human medicine to screen newborns for hip dysplasia, and veterinary medicine adapted it for dogs decades ago.

The mechanics are straightforward. With the dog lying on its back and the hip flexed, the vet applies gentle axial pressure along the femur to push the femoral head out of the socket slightly. They then slowly abduct the leg — move it outward away from the body. If the joint is lax, the femoral head was partially displaced by the initial pressure, and as the leg rotates outward it slips back into the acetabulum (the socket). That return is what creates the palpable “clunk” or “click” that vets call a positive Ortolani sign.

If the hip is tight and well-seated, the femoral head never leaves the socket, and no click occurs. That is a negative result.

What the Ortolani Result Actually Tells You
  • A positive result means the hip is lax enough for the femoral head to partially leave and return to the socket — consistent with hip dysplasia
  • A negative result means either the hip is well-seated, OR the joint is too arthritic to subluxate (a false negative)
  • The test does not grade severity on its own — X-rays and scoring systems do that
  • Results are most reliable in dogs under 18 months before significant arthritis develops

Why Does the Test Require Sedation?

A dog with painful hips will naturally tense the muscles surrounding the joint as a protective response. That muscle tension masks laxity and makes the Ortolani test nearly impossible to perform accurately in a fully awake patient. Even a cooperative, pain-tolerant dog may guard enough to prevent the femoral head from subluxating — giving you a false negative.

Sedation or general anesthesia relaxes all the surrounding musculature, allowing the vet to feel what the joint is actually doing without interference. This is why the Ortolani test is often performed at the same appointment as other sedated procedures — spay or neuter surgeries, dental cleanings, or dedicated hip screenings.

The Orthopedic Foundation for Animals includes the Ortolani test as part of their PennHIP and OFA screening protocols, typically performed in conjunction with radiographs under sedation.

How Does It Fit Into the Broader Hip Dysplasia Workup?

The Ortolani test is a screening tool, not a diagnostic endpoint. Here is how it typically fits into the sequence of events:

Step 1 — Physical examination: Your vet watches the dog move, assesses gait, checks for muscle asymmetry, and palpates the hips for pain or crepitus (grinding).

Step 2 — Ortolani test: Performed under sedation, this reveals whether joint laxity is present and gives the vet a rough sense of how loose the joint is.

Step 3 — Radiographs (X-rays): Hip films taken under sedation or anesthesia confirm joint conformation, measure the degree of subluxation, and identify any arthritic changes already present. You can read more about what those films show in our article on hip X-rays for dogs.

Step 4 — Scoring and planning: Based on the combined picture, your vet or a veterinary orthopedic specialist discusses options — whether that is monitoring, medical management, or surgical intervention.

If a dog tests positive on Ortolani, it is not the end of the conversation. It is the beginning of it.

When the Ortolani Test Can Miss Things
  • Dogs with advanced arthritis may have a false negative — the joint is too stiff to subluxate even though dysplasia is present
  • Very tight-muscled breeds may guard even under light sedation, requiring deeper anesthesia for accurate results
  • A negative result in a young dog with clinical signs of hip pain still warrants X-rays — do not stop investigating based on a single negative Ortolani alone
  • The test is performed bilaterally — both hips are checked, since hip dysplasia is often asymmetric

What Happens If the Test Is Positive?

A positive Ortolani finding — especially in a young dog — is taken seriously, but it does not mean your dog’s future is written in stone. Many dogs with measurable hip laxity go on to live comfortable lives with the right management.

From what I have seen following hip dysplasia caregiving communities, a common next step after a positive Ortolani result in a young dog is a conversation about whether surgical intervention makes sense before secondary arthritis develops. Two surgical options specifically target hip laxity in younger patients:

  • JPS (Juvenile Pubic Symphysiodesis): A relatively minor procedure done before 18–20 weeks of age that changes pelvic geometry as the puppy grows, helping the socket better cover the femoral head.
  • TPO (Triple Pelvic Osteotomy): A more involved surgery for dogs typically under 10–12 months, cutting and rotating the pelvis to improve hip coverage.

For older dogs or those where surgery is not pursued, the focus shifts to pain management, weight control, exercise modification, and joint support. Our article on hip dysplasia management strategies covers that side of the picture in detail.

Questions Worth Asking After a Positive Result
  • What is the degree of laxity — mild, moderate, or severe?
  • Are both hips affected, and equally so?
  • Are there already arthritic changes visible on X-ray?
  • Is my dog’s age and weight appropriate for surgical options?
  • What are the realistic long-term outcomes with and without surgery?

Is the Ortolani Test the Same as PennHIP?

No — these are related but distinct. PennHIP is a standardized radiographic screening system developed at the University of Pennsylvania that measures the distraction index (DI) of the hip joint under controlled positioning. It requires specific training and certification to perform correctly.

The Ortolani test is a physical maneuver, not a radiographic measurement. PennHIP and OFA-standard X-rays give you objective, measurable data that can be compared across populations. The Ortolani test gives your vet real-time tactile feedback about joint behavior that imaging alone cannot capture. They complement each other.

Many vets perform the Ortolani test as part of a sedated hip evaluation that also includes radiographs — you get both the hands-on assessment and the imaging data from a single anesthesia event.

If you are dealing with potential hip dysplasia in a dog showing rear-end symptoms that are hard to sort out, our article on conditions mistaken for canine hip dysplasia may help you understand what else could be in the differential picture.

The orthopedic exam is one piece of a larger puzzle, but it is often the piece that gets the right conversation started. If your vet mentions performing an Ortolani test, now you know exactly what they are checking for — and why that little click matters.

Frequently Asked Questions

What does a positive Ortolani test mean in a dog?

A positive Ortolani test means the vet felt the femoral head (the ball of the hip joint) slip back into the socket during the exam — a sign of hip laxity, or looseness, in the joint. It strongly suggests hip dysplasia but is not a standalone diagnosis; X-rays are typically taken next to confirm the degree of joint change.

Does the Ortolani test hurt the dog?

The test is generally performed under sedation or anesthesia in dogs, so it should not cause pain during the exam itself. An awake dog with painful hips may tense up and prevent the vet from performing it accurately, which is why sedation is standard practice for this assessment.

Can the Ortolani test miss hip dysplasia?

Yes. The Ortolani test can produce false negatives, particularly in dogs with severe chronic hip dysplasia where the joint has stiffened and the femoral head can no longer reduce back into the socket. It is most reliable in younger dogs with mobile, lax joints.

At what age is the Ortolani test typically done?

The Ortolani test is most commonly performed in puppies and young dogs, often between 4 and 8 months of age, when hip laxity is most detectable. It is also used in breeding-program screenings and can be performed in adult dogs, though it becomes less sensitive as joint changes progress.

This guide is based on real experience and should be used alongside professional veterinary care. Always consult your veterinarian before starting any new treatment or making changes to your dog’s care plan.