Patellar Luxation in Cows: Slipping Kneecap and Stifle Problems in Cattle

Quick Answer
  • Patellar luxation in cattle means the kneecap is not tracking normally in the stifle joint. In practice, many cattle are seen for traumatic patellar displacement or for upward fixation of the patella, often called a locked stifle.
  • Common signs include a hind leg stuck in extension, dragging of the toe, sudden jerking release of the limb, marked lameness, reluctance to walk, and trouble rising.
  • See your vet promptly if a cow cannot bear weight, cannot extend or flex the stifle normally, is down, or has swelling, pain, or repeated locking episodes.
  • Diagnosis usually relies on a hands-on exam and gait assessment. Your vet may also recommend radiographs to look for fracture, joint injury, or confirm patellar position.
  • Typical 2025-2026 US cost range is about $350-$650 for farm call, exam, and basic workup, and roughly $900-$2,500+ if sedation, imaging, or surgical correction is needed.
Estimated cost: $350–$2,500

What Is Patellar Luxation in Cows?

Patellar luxation means the patella, or kneecap, moves out of its normal track in the femoral groove of the stifle. In cattle, true patellar luxation is uncommon, but patellar and stifle problems do happen. Some calves are born with developmental limb abnormalities that affect patellar tracking, while adult cattle are more likely to develop stifle injury after slipping, falling, mounting trauma, or struggling while down.

A related condition that is discussed often in cattle is upward fixation of the patella, also called a locked stifle. In that problem, the patella catches on the medial trochlear ridge and the hind limb stays extended until it suddenly releases. To a pet parent or producer, both conditions can look like a "slipping kneecap" because the leg does not move normally.

These problems matter because cattle depend on steady hind-limb function to stand, walk to feed and water, breed, calve, and avoid becoming down. Even when the issue is not immediately life-threatening, delayed care can lead to pain, muscle strain, joint damage, pressure sores, and a worse outlook for recovery.

Symptoms of Patellar Luxation in Cows

  • Hind limb held straight or "locked" behind the body
  • Dragging of the toe or scuffing of the hoof
  • Sudden jerking or snapping release when the leg unlocks
  • Marked lameness or non-weight-bearing on one hind leg
  • Difficulty rising, turning, backing, or walking on slick ground
  • Visible swelling, heat, or pain around the stifle
  • Abnormal patella position that can sometimes be felt on exam
  • Reduced appetite, isolation, or drop in milk production from pain and reduced mobility

When to worry depends on how severe the lameness is and whether the leg is stuck. A brief, occasional locking episode still deserves a veterinary exam, especially in a growing calf or breeding animal. See your vet immediately if the cow is down, cannot bear weight, has severe swelling, seems very painful, or the limb stays fixed in extension. Those signs can overlap with fractures, cruciate injury, femoral nerve paralysis, or other serious stifle problems.

What Causes Patellar Luxation in Cows?

In adult cattle, stifle injuries are often linked to trauma. Slipping on wet concrete, falling, mounting activity, rough handling, transport stress, or struggling while recumbent can all injure the structures that stabilize the patella and stifle. Older animals may also have degenerative joint changes that make the joint less stable over time.

In calves and young stock, abnormal limb conformation or developmental orthopedic problems may play a role. Case reports in large animals describe congenital or developmental patellar instability, sometimes along with trochlear groove abnormalities or other limb deformities. In some breeds and populations, conformation appears to matter.

For upward fixation of the patella, risk factors reported in cattle and other large animals include straight hind-limb conformation, poor muscling, and mechanical catching of the medial patellar ligament over the trochlear ridge. A classic cattle case series also found increased risk in Brahman and Brahman-type cattle. Your vet will also consider look-alike conditions such as cruciate ligament injury, meniscal injury, distal femur fracture, and femoral nerve paralysis.

How Is Patellar Luxation in Cows Diagnosed?

Diagnosis starts with a careful history and physical exam. Your vet will watch the cow walk if it is safe, assess whether the stifle can flex and extend normally, and feel for swelling, pain, crepitus, or an abnormal patellar position. In calves, inability to extend the stifle can resemble femoral nerve paralysis, so localization of the problem is important.

If the limb is intermittently or persistently locked in extension, your vet may suspect upward fixation of the patella. If the kneecap feels displaced or the joint is unstable, traumatic luxation or another stifle injury moves higher on the list. Because many stifle injuries in cattle look similar from a distance, the exam is used to rule out lower-limb causes and focus attention on the stifle.

Radiographs are often the next step when the diagnosis is unclear, when trauma is suspected, or when your vet needs to check for fracture, joint disease, or confirm patellar position. In selected cases, ultrasound or referral-level imaging may help evaluate soft tissues and joint effusion. The final diagnosis guides whether conservative management, field surgery, referral surgery, or humane culling is the most practical option.

Treatment Options for Patellar Luxation in Cows

Spectrum of Care means you have options. Here are treatment tiers at different price points.

Budget-Conscious Care

$350–$900
Best for: Mild intermittent locking, cases where upward fixation is suspected without major trauma, or situations where the cow is stable and your vet believes a trial of supportive care is reasonable
  • Farm call and orthopedic exam
  • Gait assessment and stifle palpation
  • Deep bedding, confinement, and improved footing
  • Short course of NSAID pain control if appropriate for the animal and production status
  • Activity restriction and close monitoring for ability to rise, walk, and eat
  • Discussion of prognosis, welfare, and whether referral or surgery is realistic
Expected outcome: Fair for mild intermittent locking; guarded to poor for severe traumatic luxation or major stifle injury managed without surgery
Consider: Lower upfront cost range, but it may not correct a true luxation or recurrent locked stifle. Delayed improvement can mean ongoing lameness, lost production, and a higher chance that surgery or culling is still needed.
Most Common

Recommended Standard Treatment

$900–$2,500
Best for: Most cattle with recurrent locked stifle, confirmed upward fixation, or suspected patellar instability where your vet believes surgery offers a practical chance of improved function
  • Farm call or hospital exam
  • Sedation and radiographs when indicated
  • Targeted pain control and aftercare planning
  • Field or hospital surgical correction for appropriate cases, commonly medial patellar desmotomy for recurrent upward fixation of the patella
  • Bandage or incision care as needed
  • Recheck exam and return-to-activity guidance
Expected outcome: Often fair to good for upward fixation when the right case is selected; one cattle series reported elimination of clinical signs in 25 of 28 followed surgical cases
Consider: Requires handling, restraint, and aftercare. It adds procedure cost and may not be appropriate if there is severe concurrent joint damage, poor body condition, or limited long-term production value.

Advanced / Critical Care

$2,500–$6,000
Best for: High-value breeding animals, unusual traumatic luxations, calves with developmental deformity, or cases where pet parents want every available option and referral is feasible
  • Referral hospital evaluation
  • Advanced imaging or more extensive radiographic workup
  • Complex orthopedic surgery for traumatic or developmental patellar luxation
  • Hospitalization, perioperative monitoring, and more intensive nursing care
  • Longer rehabilitation planning
  • Welfare-based decision support if prognosis is poor
Expected outcome: Variable. Some individual large-animal case reports describe good outcomes after surgery, but prognosis depends heavily on chronicity, joint damage, body size, and whether the problem is traumatic, congenital, or part of broader stifle disease
Consider: Highest cost range and most intensive handling. Referral surgery may not be practical for every cow, and even advanced care can carry a guarded prognosis in chronic or severe cases.

Cost estimates as of 2026-03. Actual costs vary by location, clinic, and individual case.

Questions to Ask Your Vet About Patellar Luxation in Cows

Bring these questions to your vet appointment to get the most out of your visit.

  1. Do you think this is true patellar luxation, upward fixation of the patella, or another stifle injury?
  2. What findings on the exam make you most concerned about fracture, cruciate injury, or femoral nerve paralysis?
  3. Would radiographs change the treatment plan in this cow?
  4. Is conservative care reasonable here, or do you recommend surgery sooner rather than later?
  5. If surgery is an option, what procedure are you considering and what function should we realistically expect afterward?
  6. What is the expected cost range for farm treatment versus referral treatment in our area?
  7. How should we manage footing, bedding, and movement during recovery?
  8. At what point would humane euthanasia or culling be the kindest option if recovery is unlikely?

How to Prevent Patellar Luxation in Cows

Not every case can be prevented, especially when a calf is born with conformational problems or when a traumatic accident happens. Still, many adult cattle stifle injuries are linked to environment and handling, so prevention starts with secure footing. Dry, non-slip walking surfaces, good drainage, careful alley design, and prompt repair of slick or broken flooring can reduce slipping and falling.

Good housing also matters. Deep bedding for lame or fresh cows, enough space to rise and lie down safely, and low-stress handling can reduce the risk of struggling injuries. Down cattle need prompt veterinary attention and careful nursing because repeated attempts to force movement can worsen stifle damage.

Body condition and muscling may also influence patellar stability, especially in animals prone to upward fixation. Work with your vet and herd advisors on nutrition, breeding choices, and culling decisions if certain lines show repeated conformation-related problems. For Brahman and Brahman-type cattle, it is reasonable to stay alert for locked-stifle signs because published data suggest increased risk in those cattle.

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