Luxating Patella in Dogs

Luxating patella, commonly referred to as "trick knee," is a prevalent orthopedic condition in dogs where the kneecap (patella) dislocates from its normal position. This condition can range from mild to severe, affecting a dog’s ability to move comfortably and lead an active life. Here, we’ll explore the causes, signs, treatments, and preventive measures for luxating patella in dogs, while addressing common questions owners have.

What Is Luxating Patella in Dogs?

The patella, or kneecap, sits in a groove at the end of the femur (thigh bone). It normally moves up and down as the knee bends and straightens. In dogs with a luxating patella, the kneecap slides out of this groove, causing pain and difficulty walking.

Patellar luxation can occur medially (inside of the leg) or laterally (outside). Medial luxation is more common, especially in small and toy breeds like Chihuahuas, Poodles, and Yorkshire Terriers.

Signs of Luxating Patella in Dogs

Early detection is crucial for managing luxating patella effectively. Common signs include:

• Intermittent skipping or limping: Dogs may occasionally hold up the affected leg.
• Sudden yelping during activity: Discomfort or pain when the kneecap dislocates.
• Abnormal gait: A "bunny hopping" motion is a common indicator.
• Difficulty standing or jumping: Dogs may struggle with activities requiring strong knee function.
• Stiffness in the joint: Particularly after exercise or prolonged inactivity.

Grades of Patellar Luxation in Dogs

Luxating patella is classified into four grades based on severity:

1. Grade I: The kneecap can be manually dislocated but returns to its position naturally. This grade often causes little to no pain.
2. Grade II: The kneecap dislocates easily during movement but can be repositioned manually. Dogs may show intermittent lameness.
3. Grade III: The kneecap remains dislocated most of the time and is harder to reposition. Dogs may walk with a visible deformity.
4. Grade IV: The kneecap is permanently dislocated and cannot be repositioned. This grade causes significant discomfort and mobility issues.

Causes of Luxating Patella in Dogs

Luxating patella is often a genetic condition, but other factors can contribute:

• Genetics: Breeds like Boston Terriers, Pomeranians, and Bulldogs are predisposed.
• Trauma: Injuries to the knee joint can lead to luxation.
• Abnormal bone development: Deformities in the femur or tibia can misalign the kneecap.
• Obesity: Excess weight puts added strain on joints.
• Joint wear and tear: Arthritis or degenerative joint diseases can exacerbate the condition.

Luxating Patella Treatment in Dogs

Treatment depends on the severity of the condition:

1. Non-Surgical Management

   • Physical Therapy: Strengthening the surrounding muscles can stabilize the joint.
   • Weight Management: Maintaining a healthy weight reduces stress on the knees.
   • Bracing: Orthopedic braces can help keep the kneecap in place, particularly in mild cases.
   • Medications: Anti-inflammatory drugs may alleviate pain and reduce swelling.

2. Surgical Intervention Surgery is recommended for Grades III and IV, or when non-surgical treatments fail. Common surgical techniques include:

   • Tibial tuberosity transposition: Realigns the kneecap to its proper position.
   • Trochlear groove deepening: Deepens the groove to keep the patella in place.
   • Soft tissue reconstruction: Adjusts surrounding tissues for improved stability.

Luxating Patella Surgery in Dogs

Surgery is the most effective treatment for luxating patella in dogs. On average, the cost ranges between $1,500 and $5,000 per knee.

Luxating patella surgery aims to restore the kneecap (patella) to its proper position and ensure it remains stable during movement. The specific surgical approach depends on the severity of the condition and the underlying cause. Here’s what vets typically do during the surgery:

1. Trochlear Groove Deepening:
   If the groove where the kneecap sits is too shallow, the surgeon deepens it to securely hold the patella. This prevents it from sliding out of place during movement.

2. Tibial Tuberosity Transposition:
   When the patella is misaligned due to the attachment point of the patellar ligament, the surgeon repositions the tibial tuberosity (the bony prominence where the ligament attaches) to align the kneecap properly.

3. Soft Tissue Reconstruction:
   Surgeons may tighten or loosen surrounding ligaments and tissues to balance the forces acting on the patella. This ensures stability and reduces the likelihood of future dislocations.

4. Bone Realignment:
   In severe cases, if the bones of the leg are abnormally shaped, they may need to be cut and realigned (osteotomy) to correct the underlying structural issue.

5. Suture Stabilization:
   Special sutures may be placed temporarily to hold the kneecap in position while the surgical site heals.

Post-Surgery Recovery

The dog’s recovery involves rest, limited activity, and possibly physical therapy to regain strength and mobility. Surgery has a high success rate, especially when performed by an experienced veterinary surgeon. Most dogs regain normal or near-normal function after 8–12 weeks of recovery.

Luxating patella surgery has a high success rate, with most dogs regaining full function of the affected leg. Recovery involves:

• Postoperative care: Restricted activity, physiotherapy, and pain management.
• Rehabilitation: Controlled exercises to restore strength and mobility.
• Prognosis: Most dogs recover within 8-12 weeks, though severe cases may take longer.

Can a Dog Recover from a Luxating Patella Without Surgery?

Dogs with Grades I and II often manage well with non-surgical treatments. However, severe cases typically require surgery to prevent further damage and restore normal movement.

Can a Luxating Patella Heal Itself in a Dog?

Luxating patella does not "heal" itself, as it is a structural issue. Mild cases can be managed to minimize symptoms, but the condition is unlikely to resolve without intervention.

What Happens if Luxating Patella Is Left Untreated?

Ignoring the condition can lead to complications, including:

• Chronic pain: Discomfort from repeated dislocations.
• Arthritis: Joint inflammation from ongoing wear and tear.
• Mobility issues: Severe grades can lead to permanent lameness.

How to Prevent Luxating Patella in Dogs

While genetic predisposition cannot be altered, preventive steps include:

1. Weight Management: Keep your dog at a healthy weight to reduce joint stress.
   (How to Help Dog Lose Weight)
2. Exercise: Regular, low-impact activities like swimming or walking strengthen muscles.
3. Joint Supplements: Glucosamine and chondroitin support joint health.
4. Breeding Practices: Responsible breeding reduces the prevalence of this hereditary condition.

Should You Walk a Dog with Luxating Patella?

Exercise is beneficial, but it must be appropriate:

• Controlled walks: Avoid strenuous activities that strain the knee.
• Soft surfaces: Grass or sand is gentler on joints.
• Short durations: Keep walks manageable to prevent overexertion.

Brace for Patellar Luxation in Dogs

Orthopedic braces are a non-invasive option for managing luxating patella, especially in mild cases. These braces stabilize the knee, reduce pain, and allow for more comfortable movement. Consult with your vet to ensure the correct fit and usage.

How Long Can a Dog Live with Luxating Patella?

Dogs with luxating patella can live full, happy lives with proper management. The condition itself isn’t life-threatening, but the quality of life depends on the severity and treatment approach.

Luxating patella in dogs is a manageable condition with early detection and appropriate care. Whether through non-surgical methods like weight control and bracing or surgical intervention for severe cases, dogs with this condition can lead active and pain-free lives. Regular vet check-ups, preventive measures, and a commitment to your dog’s overall well-being are key to ensuring their comfort and mobility.