CONDITION
Hip Luxation
Hip luxation describes what happens when the ball of the femur (thigh bone) slips out of the socket in the pelvis. The joint is no longer sitting in its normal position, and the leg can no longer move in the usual way. This can happen after trauma—a fall, a road traffic accident, or an awkward landing—or occasionally in association with underlying hip disease. Owners often notice sudden, severe lameness in one hind leg. The affected leg may be carried off the ground, appear shorter than the other side, or sit at an unusual angle. Some dogs will still try to bear weight; others will not put the paw down at all. Cats tend to be similarly reluctant to use the leg, and may resist being touched around the hip. This page explores what signs often accompany hip luxation, what is happening at the joint itself, how the condition is confirmed, and the range of approaches—both surgical and non-surgical—that exist to address it. Each approach carries different expectations and tradeoffs, which are discussed in later sections.
Why this matters now
Hip luxation can occur at any age, though the underlying cause often differs by life stage. Younger, active dogs may luxate a hip during vigorous play or after trauma, while older animals with pre-existing hip dysplasia or degenerative joint disease may experience luxation after relatively minor strain. Large and giant breeds prone to hip dysplasia—such as German Shepherds, Labrador and Golden Retrievers, and Rottweilers—tend to have shallower, less congruent hip sockets and so may be more vulnerable to luxation, sometimes after relatively minor trauma. Toy and Miniature Poodles carry a well-recognised predisposition to medial patellar luxation, a different joint condition affecting the kneecap rather than the hip, but there is no comparable evidence of a breed-specific predisposition to atraumatic hip luxation in Poodles. Cats of any age can luxate a hip, most often following a fall or road traffic accident.
The luxation itself happens in a single event, but what follows varies considerably between individuals. Some hips remain stable after the initial displacement and the leg stays non-weight-bearing, while others may partially reduce and then slip out again with movement. Over the hours and days that follow, soft tissue swelling around the joint typically increases, and muscle spasm can make the leg appear progressively more fixed in an abnormal position. Without intervention, chronic changes—including muscle atrophy and joint remodelling—tend to develop over weeks to months.
Signals & patterns
Early signals
Sudden severe lameness
The dog or cat will often stop using the affected hind leg within moments of the luxation occurring. The limb may be held clear of the ground, and the animal may vocalise or show visible distress when attempting to move.
Leg held at odd angle
The affected leg may appear rotated inward or outward compared to the other side, and the paw may point in an unusual direction. This reflects the new position of the femoral head relative to the pelvis.
Apparent shortening of the leg
The luxated leg often looks shorter than its pair when the animal is standing or lying down. This happens because the femoral head has moved out of the socket, altering the effective length of the limb.
Reluctance to be touched
Many animals will flinch, pull away, or vocalise when the hip area is approached or gently palpated. The joint capsule and surrounding muscles are under tension, and any movement can be uncomfortable.
Weight-shifting when standing
If the animal attempts to stand, weight is typically shifted entirely onto the unaffected hind leg and the forelimbs. Some dogs will hop on three legs rather than place the luxated limb on the ground.
Later signals
Visible muscle wasting
Over days to weeks of disuse, the muscles of the affected thigh and hip begin to lose bulk. The leg may appear noticeably thinner compared to the opposite side, particularly over the quadriceps and gluteal muscle groups.
Persistent abnormal gait
If the luxation remains unreduced, the animal may develop a compensatory way of moving, often bearing partial weight on the toe or outer edge of the paw. This pattern can become habitual even if the hip is later addressed.
Reduced range of hip movement
Chronic luxation can lead to fibrosis and thickening of the joint capsule, and the hip may become stiffer over time. Passive movement of the leg—if tolerated—often reveals a more limited arc compared to the normal side.
Click to read about the biological mechanisms
How this is usually investigated
Diagnosis typically begins with an account of the events leading up to the lameness—whether there was known trauma, a fall, or whether the onset appeared spontaneous. Physical examination follows, during which the leg's position, range of movement, and the animal's response to manipulation are noted. Radiography is usually performed to confirm the displacement and to assess the underlying joint architecture, though additional imaging may be considered when the clinical picture is unclear or when surgical planning requires more detail.
Physical examination
Radiography
Computed tomography (CT)
Ultrasonography
Arthrocentesis and synovial fluid analysis
Options & trade-offs
Management of hip luxation is shaped by the animal's size, age, general health, the underlying condition of the joint, and the time elapsed since displacement. Some hips can be returned to their socket and stabilised without surgery, while others require surgical reconstruction or removal of the femoral head to restore comfort and function. Each approach carries its own pattern of recovery, risk, and long-term outcome, and what works well for one animal may be less suitable for another.
Closed reduction and external coaptation
Under general anaesthesia or deep sedation, the femoral head is manipulated back into the acetabulum and the leg is held in position using a sling, hobbles, or other external support for several weeks. The aim is to allow the torn soft tissues—particularly the joint capsule—to heal in a way that maintains joint stability. This approach is often attempted when luxation is recent, the hip architecture is otherwise normal, and there are no complicating fractures.
Trade-offs: Re-luxation occurs in a substantial proportion of cases, particularly in animals with shallow sockets, those in which reduction is delayed beyond a few days, or when post-reduction activity is not adequately restricted. Even when the hip remains in place, some degree of osteoarthritis tends to develop over time, and muscle loss on the affected side is common during the period of restricted movement.
Toggle pin or prosthetic capsule techniques
These surgical methods aim to reconstruct or augment the damaged soft tissue structures that normally hold the femoral head in place. A toggle pin is passed through the femur and acetabulum to mimic the function of the torn round ligament, while prosthetic capsule techniques use suture material to reinforce or replace the joint capsule. The intention is to restore stability while preserving the natural ball-and-socket articulation.
Trade-offs: Surgery carries the usual risks associated with general anaesthesia and infection, and implant failure or loosening can occur, leading to re-luxation. The procedure requires a period of strict rest and controlled activity during healing, and some animals develop ongoing discomfort or stiffness even when the hip remains in place. Smaller dogs and cats tend to have better outcomes than larger, more active dogs.
Femoral head and neck excision (FHNE)
The femoral head and a portion of the neck are surgically removed, eliminating the bone-on-bone contact that causes pain. Over the weeks and months that follow, fibrous scar tissue forms between the femur and pelvis, creating a false joint that allows weight-bearing and a functional range of movement, though not equivalent to a normal hip. This approach is often considered when other methods have failed, when the acetabulum is severely damaged or dysplastic, or when the cost or complexity of joint reconstruction is not feasible.
Trade-offs: Recovery depends heavily on physiotherapy and controlled exercise to encourage formation of a supportive pseudoarthrosis and to maintain muscle mass. Cats and small dogs—typically those under 20 kilograms—tend to regain good function, while larger, heavier dogs may experience persistent lameness or reduced range of movement. Some animals develop chronic discomfort in the affected limb, and leg length discrepancy is common.
Total hip replacement
The damaged femoral head and acetabulum are replaced with metal and plastic prosthetic components, restoring a smooth, stable articulation. This option is typically reserved for larger dogs with concurrent hip dysplasia or when other surgical methods are unlikely to provide adequate function. The procedure is performed by specialist surgeons and requires precise implant sizing and placement.
Trade-offs: Total hip replacement carries the highest initial cost and requires access to advanced surgical facilities and postoperative care. Complications—including infection, implant loosening, dislocation of the prosthesis, and fracture around the implant—can occur, sometimes necessitating further surgery. When successful, the procedure can provide excellent pain relief and function, but lifelong monitoring is required and some activities may need to be modified.
Analgesia and activity modification
Pain relief is provided using non-steroidal anti-inflammatory drugs, opioids, or other analgesic agents, and the animal's activity is restricted to allow soft tissue healing and to minimise discomfort. This approach may be used alone in cases where surgical intervention is declined or not possible, or as an adjunct to other treatments. Over time, some animals develop a functional pseudoarthrosis without formal surgical intervention, though the quality of the outcome is variable.
Trade-offs: Chronic pain and lameness are common when luxation is managed without reduction or surgery, and muscle atrophy tends to be pronounced. Long-term use of analgesic medication carries its own risks, including gastrointestinal, renal, and hepatic effects, and regular monitoring may be required. This approach is generally considered less suitable for animals with good surgical candidacy, though it may be the most appropriate option in very elderly or systemically unwell individuals.
Common misconceptions
"Once a luxated hip is put back into place, it will heal completely and the joint will return to normal."
Even when closed reduction is successful and the hip remains in the socket, the torn soft tissues—particularly the round ligament and joint capsule—rarely heal back to their original strength or configuration. Most animals develop some degree of osteoarthritis over time, and the risk of re-luxation remains higher than in an uninjured hip. The goal of treatment is functional stability and comfort, not restoration of a pristine joint.
"Hip luxation always requires surgery to fix."
Closed reduction—manipulating the hip back into place without an incision—can be successful in some cases, particularly when attempted soon after injury and when the underlying joint structure is sound. However, re-luxation rates are higher with non-surgical management, and the decision between closed and open techniques depends on a range of factors including the animal's size, the cause of luxation, and the time elapsed since displacement.
"If the vet removes the femoral head, my dog will have three legs."
Femoral head and neck excision removes the damaged portion of bone, but the limb itself remains intact. Over time, scar tissue forms between the remaining femur and the pelvis, creating a false joint that allows the animal to bear weight and move the leg, though the gait may not be entirely normal. Cats and smaller dogs typically regain good function, though larger, heavier animals may experience ongoing lameness.
Related conditions
Coxofemoral Subluxation
Coxofemoral subluxation describes a partial displacement of the hip joint, whereas hip luxation involves complete loss of contact between the femoral head and the acetabulum. Both can occur after trauma or in association with underlying hip disease, and in some cases subluxation may progress to full luxation if left untreated or if further trauma occurs.
Sacroiliac Disease in Dogs
Sacroiliac disease can sometimes be confused with hip luxation in the early stages of assessment, as both can cause hindlimb lameness, reluctance to bear weight, and discomfort localised to the pelvic region. The proximity of the sacroiliac joints to the hip means that careful examination and imaging are often needed to distinguish between the two.
Iliopsoas Strain
Iliopsoas strain may occur alongside hip luxation, particularly when the luxation follows acute trauma or an awkward landing that places sudden strain on the deep hip flexor muscles. Both conditions can produce hindlimb lameness and reluctance to extend the leg fully, and owners may notice similar changes in gait or posture.
Elbow Dysplasia in Dogs
Elbow dysplasia and hip luxation both involve developmental or traumatic changes to weight-bearing joints in the limbs, and both can result in chronic lameness if not addressed. In young dogs, underlying joint laxity or malformation may predispose to luxation in some cases, particularly when hip dysplasia is present.
Septic Arthritis
Septic arthritis can occasionally develop as a complication following surgical repair of hip luxation, particularly if bacteria are introduced during the procedure or if a wound becomes infected. Both conditions produce severe lameness, joint pain, and reluctance to bear weight, though septic arthritis typically also causes systemic signs of infection.
Hip luxation often prompts questions about the underlying condition of the joint, particularly in animals with hip dysplasia or osteoarthritis, and these related conditions are discussed elsewhere within the Pain & Mobility pillar. The choice between surgical and non-surgical management, and between different surgical techniques, depends on factors that vary between individuals, and these are conversations that tend to evolve as the clinical picture becomes clearer. Some owners find it useful to explore what physiotherapy and controlled activity involve in practice, particularly when recovery depends heavily on gradual rebuilding of muscle and range of movement.