Introduction to cruciate ligament rupture in dogs
The anterior cruciate ligament plays a crucial role in the knee joint – it enables hinge-like movement of the joint and prevents the bony structures from sliding back and forth. Cruciate ligament rupture remains one of the most common orthopedic conditions in dogs.
A cruciate ligament rupture in dogs is a typical sports injury in humans. In our four-legged friends, the situation is somewhat different. Besides traumatic causes, in dogs it is usually a "degenerative process," meaning that the cruciate ligament shows signs of wear and tear over the years, becomes increasingly thin, and eventually ruptures. These changes to the ligament structure increase with age and the dog's weight (poor physical condition also has a negative impact).
A complete rupture of the cruciate ligament (cruciate ligament rupture in dogs – we have a separate page on this topic for cats) usually causes only mild to moderate pain. Although many dogs initially avoid putting any weight on the affected leg, an apparent improvement occurs within 2 to 3 weeks – the dogs partially bear weight again, until a sudden deterioration occurs: this is often the point at which the medial meniscus is severely damaged (essentially a "shock absorber" between the bony parts of the joint).
The instability of the joint is extremely distressing for the dog; with every strain, the bones shift against each other – the dog feels insecure. The situation is worsened over time by the first signs of osteoarthritis or a painful joint effusion.
Established veterinary expertise in Karlsruhe
In the Arndt small animal centre We treat cruciate ligament ruptures in dogs with specialized surgical routine. Our practice owner Veterinarian Susanne Arndt ensures through her veterinary studies at the Leipzig University The scientifically sound methodology is supported by our experienced senior physician. Sheila Martins, which continuously educates itself in the field of orthopedic soft tissue and bone surgery at the most modern veterinary medical level.
Typical relieving posture: The affected leg is often only placed on the ground with the tip of the paw.
Cruciate ligament rupture in dogs: A compact checklist for owners
What happens when the cruciate ligament tears? Unlike in humans, the cruciate ligament in dogs usually tears due to gradual degeneration. This results in painful instability in the knee joint, which, without treatment, leads to severe osteoarthritis.
Typical symptoms (look out for these signs):
- Sudden limp: Your dog almost completely relieves the weight on one hind leg.
- „Toe-tapping“: Only the tip of the paw is placed on the ground while standing.
- Initial difficulties: Lameness is especially noticeable after periods of rest or when getting up.
- Avoiding jumps: Getting into the car or jumping onto the sofa is refused.
Treatment methods at the Arndt Small Animal Center: We rely on state-of-the-art surgical procedures to permanently restore knee stability:
- TPLO (Tibial Plateau Leveling Osteotomy): The gold standard for athletic and heavy dogs.
- TTA (Tibial Tuberosity Advancement): A proven method for dynamic stabilization.
- Conservative therapy: Targeted physiotherapy for very small dogs or as a supplement to surgery.
Causes of cruciate ligament rupture in dogs
Some dog breeds are more prone to cruciate ligament ruptures due to their anatomy. They occur more frequently in larger dogs such as Rottweilers, Newfoundlands, and Staffordshire Terriers. The biomechanics of the knee joint in dogs differ from those in humans, which is why surgical techniques from human medicine cannot simply be transferred.
Anatomy of the knee joint
The knee joint is a hinge joint with approximately 30° of rotation. It consists of the thighbone (femur), the shinbone (tibia), the fibula, and the kneecap (patella). The joint's stability is ensured by two collateral ligaments and two cruciate ligaments. The cruciate ligaments prevent excessive twisting of the knee and forward sliding of the lower leg. The menisci, located between the bones, provide shock absorption and stabilization.
Anatomy of the knee joint: femur, tibia, fibula, patella, collateral ligaments, cruciate ligaments, menisci.
The cruciate ligament is one of the most important tendons of the knee.
Together with the collateral ligaments, the cruciate ligaments stabilize the knee joint. Each knee joint has a lateral and a medial cruciate ligament, which are actively involved in extending the leg. The cruciate ligaments get their name from the fact that the two ligaments cross each other in the middle of the knee joint. If one of the cruciate ligaments tears, the stability and mobility of the knee are severely restricted.
The most important symptoms and signs of a cruciate ligament rupture in dogs
Dogs with a cruciate ligament rupture typically exhibit difficulty getting started, a flexed posture of the affected hind leg, and touching the ground only with their toes. The hind leg muscles atrophy, and when sitting, the knee is tucked under the belly or abducted to the side. Signs of pain only appear if the ligament tears further.
Cruciate ligament rupture in dog gait pattern
In most cases, a cruciate ligament rupture in dogs is caused by a so-called... “Start-up sluggishness” The injury is marked. Depending on the severity of the injury, the lameness will vary. With minor tears, your dog may limp slightly for a few days and then walk normally again. Such a pre-existing injury increases the risk of a sudden jerk if your dog moves spontaneously and abruptly. Dogs also tense their hind leg and bend it. They usually don't lift their paw: if anything, only the tip of the paw touches the ground.
Your dog alternates between running fast and walking very slowly. The affected leg becomes thinner due to muscle atrophy. The cruciate ligament is painful with each subsequent rupture (otherwise, dogs don't show pain with degenerative tears). In the case of a traumatic cruciate ligament rupture, your dog will exhibit sudden, severe lameness and pain at the time of the injury. Your dog will stretch its leg out to the side while sitting. The knee joint is swollen. The knee of your dog will feel "hot" (significant heat buildup).
How is a cruciate ligament rupture diagnosed in dogs?
A cruciate ligament rupture test in dogs is performed using the so-called Drawer test Diagnosed (tibial compression test in a dog with a cruciate ligament rupture). With this test, the veterinarian checks the mobility of the knee joint. To perform the test, pull the lower leg towards the front legs. If the lower leg can be pulled forward like a drawer, unlike the thigh, this indicates a tear of the anterior cruciate ligament. Additionally, fluid accumulation will be clearly palpable.
This test is generally easier to perform on small dogs than on larger breeds. Larger dogs have more muscle mass, which they contract during the test. For this reason, the drawer test can be negative even if your dog has a cruciate ligament rupture. To confirm the diagnosis, our center performs an additional test. X-ray image or CT manufactured.
Digital X-ray for precise measurement of joint geometry and the tibial plateau.
How does a cruciate ligament rupture occur in dogs: Degenerative or traumatic cruciate ligament rupture?
A cruciate ligament tear (rupture) can occur in two different ways:
a) Traumatic injury
On the one hand, an injury/torn cruciate ligament in a dog can occur as a result of an accident. In this case, it is referred to as trauma or a traumatic fracture.
b) Degenerative rupture / degenerative cruciate ligament tear in dogs
When the cruciate ligament tears due to prolonged wear and tear, it is referred to in medicine as a degenerative rupture. Aging, poor posture, and constant overuse can lead to tears in your dog's cruciate ligament that deepen over time. Therefore, this type of cruciate ligament tear is likely due to pre-existing damage to the ligament. Obesity, strenuous physical activity, or an unusual shinbone structure can increase the risk of degenerative cruciate ligament tears. The difference between a cruciate ligament tear in dogs and humans lies in the severity of the tear. In dogs, the cruciate ligament usually doesn't tear completely, but rather fiber by fiber (cruciate ligament tear in a dog's hind leg).
Cruciate ligament rupture in dogs: surgical methods
The development of numerous surgical methods for cruciate ligament tears has progressed from intracapsular and extracapsular techniques to modern corrective osteotomies. Common to all methods is the assessment and, if necessary, treatment of the menisci (cleaning up, meniscectomy, etc.) and, crucially, the stabilization of the knee joint. A distinction is made between intra- and extra-articular techniques and those with or without ligament replacement.
In our small animal center, we use all common and proven surgical methods:
- Capsular fascial plication according to Meutstege
- lateral thread reining and a mixture of 1 & 2
- Zlig (formerly: VetLig – intra-articular cruciate ligament replacement)
- TTA Rapid
- TPLO
Which cruciate ligament surgery method is right for your animal?
This depends on many factors, which we would be happy to discuss with you by phone, free of charge, after receiving your documents. The choice of surgical method depends on the patient's physical condition (methods 1 and 2 are often not recommended for heavier patients), the degree of osteoarthritis in the joint, the involvement of the menisci, and ultimately, it is also a question of cost. This means that, as the pet owner, we will determine the right approach together during the consultation.
| method | For which dogs? | Advantages (Pros) | Disadvantages (Cons) |
|---|---|---|---|
| TPLO | Heavy, active dogs (>15kg), breeds with anatomical predisposition. | Sustained stabilization. Established gold standard. | Invasive (bone cutting). Long healing process. |
| Zlig | All sizes, very heavy dogs (>70kg), young animals, bilateral cracks. | Preservation of bone anatomy. Immediate weight-bearing is possible after surgery. | Slightly higher material costs. Material failure is rare. |
| TTA Rapid | Medium to large dogs. | Stimulates bone growth. Rapid initial load-bearing capacity. | Higher rate of late meniscus damage than with TPLO. |
| Extracapsular ligament replacement | Very small dogs & senior dogs (<10kg). | Shorter anesthesia duration. Lower price. | Loosening (osteolysis) or renewed cracking is possible. |
TPLO (Tibial Plateau Leveling Osteotomy)
In this surgical method for cruciate ligament tears, a quarter-circle bone incision is made at the upper end of the tibia. The articular surface of the tibia is then rotated posteriorly according to a pre-calculated measurement. It is fixed in this new position with a bone plate and screws. The rotation reduces the inclination of the articular surface. The goal is a postoperative inclination of 5°.
The angle between the patellar ligament and the articular surface is then approximately 90°. Experiments have shown that at this angle, the cranial tibial thrust is neutralized and the tension on the anterior cruciate ligament (if it is not yet completely torn) is significantly reduced.
Advantages of TPLO:
✔ Permanent and reliable stabilization of the knee joint even under heavy load, even in animals with high body weight.
✔ For certain breeds and associated joint problems, the only possible solution (especially for dogs that are generally prone to cruciate ligament tears due to their anatomy (e.g. Old English Bulldog)).
✔ The leading cruciate ligament surgery method in Germany.
Disadvantages of TPLO:
X Major procedure involving sawing the bone.
X Redirection of forces in an unnatural way.
X Long healing process.
X Relatively high price including all aftercare costs such as physiotherapy.
TTA (Tibial Tuberosity Advancement) & TTA Rapid
A method similar to TPLO is TTA (Tibial Tuberosity Advancement). Here, the cruciate ligament tear is also treated by cutting the bone, thus altering the biomechanics of the knee joint. By moving the patellar tendon forward, an almost right angle between the patellar tendon and the tibial articular surface is achieved, similar to TPLO.
A comprehensive comparison between the two surgical methods TPLO & TTA (classic) can be found in the dissertation by Dr. Monika Höpfl here.
With the relatively new TTA Rapid Method Better results can now be achieved than with the classic TTA method. Success rates are comparable to those of TPLO methods, which is why we will offer this method for specific breeds for which the Vetlig method is not suitable.
Current studies on TTA-Rapid can be found here:
https://www.thieme-connect.com/products/ejournals/abstract/10.1055/s-0039-1684050
https://pubmed.ncbi.nlm.nih.gov/25330358/
And the following study explains why the TTA Rapid implant, made from pure Grade 1 titanium, with Dodecahedron unit cell structure stimulates bone growth:
https://pubmed.ncbi.nlm.nih.gov/32344664/
What is the difference between TPLO and TTA?
When a veterinarian performs a TPLO (Tibial Plateau Lope), they make a circular incision in the dog's tibia. They then place special plates at the appropriate points and screw the tibia and plates into place in a different position. The goal of this method is to prevent biomechanical slippage of the leg, thus eliminating the need for the cruciate ligament's supporting function. In a TTA (Transcutaneous Traction Osteotomy), additional plates and a spacer are screwed into the lower leg. Variations in the angle of the patellar tendon and altered fusion of bone structures also prevent slippage of the lower leg.
The advantage of both surgical techniques (compared to ligament replacement) is that the cruciate ligament cannot tear again because it hasn't been replaced. This means that your dog can return to sporting and protective activities after recovery and physiotherapy. A significant disadvantage, especially in very young or very old dogs, is that a repeat cruciate ligament surgery is highly unlikely, and in the worst-case scenario, amputation may be necessary. Our experience with artificial cruciate ligaments like the Zlig or Novelig, based on over 200 surgeries, is very positive. Our Petlig Method® has proven particularly effective in cases of bilateral cruciate ligament ruptures.
Extracapsular ligament replacement (Ruby, Tightrope, Flo/Meutstege ligament replacement)
Extracapsular ligament reconstruction is frequently used in smaller dogs with cruciate ligament ruptures. In this procedure, a synthetic ligament is attached outside the joint, following the course of the anterior cruciate ligament. The method of fixation varies depending on the surgical technique. This can be achieved with bone anchors in the femur and tibia (Ruby), with drill holes in the femur and tibia (Tightrope), or with a bone anchor in the femur and a drill hole in the tibia (Flo).
Advantages of extracapsular ligament replacement:
✔ Shorter anesthesia and surgery duration
✔ Lower price
✔ Good experiences with small and medium-sized dogs
✔ Faster healing process than with the aforementioned methods
Disadvantages of extracapsular ligament replacement:
A replacement cruciate ligament can tear again, just like a normal cruciate ligament.
X „Loosening“ (osteolysis) of the bone drill holes in the Tigthrope method, resulting in renewed instability.
Intracapsular ligament replacement – Zlig (formerly: VetLig)
This method has been used in humans for 25 years. The body's own or artificial material (tendons, parts of the patellar ligament, fascia) is used to replace the torn cruciate ligament.
For a long time, this method proved ineffective in treating cruciate ligament ruptures in dogs. Due to the difficulty in controlling the stress on the knee joints after surgery in dogs, the ligament replacement often tore again. With the development of new materials in medical technology, it is now possible to offer dogs and cats a surgical method that is considered state-of-the-art in humans, as it best replicates the animal's natural anatomy and, unlike TPLO/TTA, does not involve any stressful changes to the bones.
Zlig (formerly VetLig), developed after extensive preliminary work by Dr. Jacques Pillipe Laboureau, is a synthetic ligament available for intra-articular cruciate ligament replacement in small animals. Using a tunnel technique, Zlig is implanted as a total replacement for the cruciate ligament. The braided extra-articular portions of the ligament are anchored in femoral and tibial bone tunnels using cannulated titanium interference screws. This technique does not cause irreversible damage.
Advantages of Zlig:
✔ Can also be used with very heavy dogs >70kg
✔ Replication of natural anatomy without serious intervention in bone structure
✔ The patient's hind leg can bear weight immediately (!) after the surgery without risks.
✔ Lower costs than with TPLO or TTA when considering the total effort including aftercare and physiotherapy.
✔ Especially in young animals, this method does not preclude the later use of Zlig or TPLO/TTA again – the latter, however, are a one-time and permanent procedure.
✔ A good solution for bilateral ligament tears in smaller dog breeds, because both cruciate ligaments can then be replaced in one operation with a single anesthetic risk (Petlig Method®)
Disadvantages of Zlig:
X Higher costs than with capsular fascial plication according to Meutstege or lateral suture fixation
X Not suitable for all breeds (see above – e.g. very rare with Old English Bulldogs)
We offer all the methods mentioned here and are one of the leading practices in Germany for the Zlig method.
Learn more about the Zlig methodEpidural anesthesia during our cruciate ligament surgeries
In all our cruciate ligament surgeries, we strive to be as gentle as possible on your dog and minimize risks. This means that a shallower depth of anesthesia with this type of local anesthesia also reduces the anesthetic risk, even for older animals. You can find more information about epidural anesthesia in our article "Epidural Anesthesia for TPLO" or in the following informational video:
Cost of cruciate ligament surgery in a dog
Treating a cruciate ligament rupture in a dog is never inexpensive. Simple procedures like capsular plication start at €900, plus physiotherapy, etc. TPLO/TTA surgery starts at €2500, plus physiotherapy and aftercare. Artificial cruciate ligament replacement methods cost similarly, but the subsequent physiotherapy and medication costs are lower because the healing time is generally much faster.
Therefore, we recommend that owners of particularly vulnerable dog breeds (we observe cruciate ligament ruptures especially in young dogs, particularly Labradors, Golden Retrievers, all Bulldog breeds or heavier dog breeds) take out surgical insurance or pet health insurance early on.
| Performance phase (according to GOT) | General practitioner (basic) | Center (Specialized) | Aftercare & Rehabilitation |
|---|---|---|---|
| Phase 1: Preparation & Diagnostics Initial orthopedic examination, X-ray (2 planes), blood profile. |
approx. €410 – €620 | Included with initial consultation | – |
| Phase 2: The Operation TPLO / Zlig (incl. material & epidural anesthesia). |
– | from €3,000 – €3,800 | – |
| Phase 3: Aftercare & Rehabilitation Wound check, follow-up x-ray (weeks 6-8), physiotherapy. |
– | – | approx. €500 – €930 |
| Estimated total costs (example TPLO) | approx. €3,900 – €5,300 | ||
Healing process after cruciate ligament surgery
| Area | Weeks 1-2 | Weeks 3-4 | Weeks 5-6 | Weeks 7-8 | From month 4 |
|---|---|---|---|---|---|
| Leash mode | ✔ Short | ✔ Short | ✔ Controlled | Caution | Normal |
| dog walking | 3 x 5-10 min. | 4 x 15 min. | 4 x 20 min. | increase | Construction |
| Action* | ✘ | ✘ | Minimal stimuli | Slightly increasing | After consultation |
| Physiotherapy | Quiet | mobilization | Active | Muscle building | maintenance |
* Jumping, romping, stairs, getting out of the car.
Physiotherapy with a dog
Regardless of the surgical technique, your dog/cat should receive pain medication and possibly cartilage-building supplements after cruciate ligament surgery. The healing time after a TPLO cruciate ligament tear is approximately three months. In contrast, an artificial ligament replacement has a healing time of about one month. The most important measures during the healing process are: Consistent physiotherapy, regular weight checks, gentle exercise, and mandatory leash training. We have compiled more information about physiotherapy measures here.
Prevention of cruciate ligament rupture in dogs
If your dog currently has healthy cruciate ligaments or has already had ligament replacement surgery, you can take proactive steps to prevent a (new) cruciate ligament rupture. Since overweight dogs are more prone to overloading their joints and cruciate ligaments, you should ensure your dog maintains a healthy weight. Additionally, you can support their joints with nutritional supplements. We'd be happy to advise you on the right ones.
Anyone wanting to engage in competitive sports with their dog should pay attention to the dog's age. High stress on the joints can lead to cruciate ligament ruptures in both puppies and older adults. A healthy, normal-weight adult dog, on the other hand, enjoys physical activity.
To reduce the risk of a cruciate ligament rupture in your dog, you should take some preventative measures:
- 1. Weight check: Obesity is a significant risk factor for cruciate ligament ruptures. Make sure your dog maintains a healthy weight.
- 2. Regular exercise: Ensure your dog gets regular exercise to keep its muscles and joints healthy. Avoid sudden changes of direction or jumps that could put excessive strain on the joints.
- 3. Non-slip floors: Avoid slippery floors in your home. Use non-slip mats or rugs.
- 4. Early detection of joint problems: If you notice any signs of joint problems in your dog, consult a veterinarian immediately. Early diagnosis and treatment can reduce the risk of cruciate ligament rupture.
Frequently Asked Questions – about cruciate ligament rupture in dogs (FAQ)
1. Can a cruciate ligament tear in a dog heal on its own?
A dog's cruciate ligament rupture healing on its own is unlikely to be possible, as dogs tend to put more strain on the uninjured side during a cruciate ligament rupture, which can also cause damage on the uninjured side.
2. How quickly does a dog with a torn cruciate ligament need surgery?
The urgency of surgery depends on various factors. Complete cruciate ligament tears generally require surgery to restore joint function. In many cases, surgery is recommended within 1-2 weeks of diagnosis to minimize the risk of secondary damage to the articular cartilage and other structures. Early intervention can help slow the progression of osteoarthritis.
3. What happens if you don't have surgery for a torn cruciate ligament?
If a cruciate ligament rupture in a dog is left untreated, various complications can arise. The stability of the affected joint remains compromised, which can lead to increased instability and pain for the animal. In the long term, there is an increased risk of developing osteoarthritis and other degenerative changes in the joint. Therefore, the decision not to operate on a cruciate ligament rupture should be carefully considered.
4. Does a dog experience pain when it has a cruciate ligament rupture?
Yes, a dog can experience pain with a cruciate ligament rupture. The pain results from the instability of the affected joint, the inflammatory response, and possible accompanying injuries, such as meniscus damage.
5. How much does cruciate ligament surgery cost for a dog in Karlsruhe?
Simple procedures like capsular plication start at €900 plus physiotherapy. TPLO/TTA surgery starts at €2,500 plus aftercare. The total cost according to the German Fee Schedule for Surgeons (GOT) often ranges between €3,900 and €5,300.
6. Cruciate ligament rupture in dogs: surgery – yes or no?
Cruciate ligament rupture in dogs: Healing time without surgery: In small dogs, conservative treatment of a cruciate ligament rupture is sometimes possible. However, this is generally not recommended by veterinarians. The reason for this is that there is a risk of meniscus damage if the cruciate ligament is not operated on. In the worst case, both cruciate ligaments in your dog could tear over time due to extreme overuse.
7. Does a cruciate ligament rupture in a dog always require surgery?
In most cases, yes. Because the dog's knee joint is under constant tension due to its anatomy (sloping tibial plateau), a tear rarely heals on its own. Surgery like TPLO prevents further damage such as meniscus tears and severe osteoarthritis.
8. How long does it take to heal after a cruciate ligament surgery (TPLO)?
The first healing phase lasts approximately 6–8 weeks. During this time, keeping the dog on a leash and controlled exercise (physiotherapy) are crucial. After about 3 months, the bone is usually completely healed and the dog can bear full weight again.
9. What is the difference between TPLO and Zlig?
In TPLO, the biomechanics are altered by cutting the bone (osteotomy). Zlig is an intra-articular ligament replacement procedure. Here, a synthetic high-performance ligament is inserted in place of the torn cruciate ligament without cutting the bone.
10. How do I know if my meniscus is torn?
Dogs often show apparent improvement for several weeks after the actual cruciate ligament rupture. If a massive, renewed lameness then suddenly occurs, this is often the moment when the medial meniscus, which acts as a shock absorber, has been severely damaged or pinched.
Would you like a free consultation with one of our experts? Then use our contact form – we will get back to you promptly:
