CONDITION
Meniscal Injury of the Stifle
The meniscus is a crescent-shaped piece of cartilage that sits between the bones of the stifle (knee), acting as a cushion and stabiliser during movement. When this structure tears or becomes damaged—often in dogs with cruciate ligament problems, but sometimes on its own—it can alter the way the joint moves and feels. The injury may happen suddenly or develop gradually as the cartilage wears down. Owners often notice a distinct click or pop when the dog walks, lameness that seems to persist or worsen despite rest, or reluctance to bear full weight on the leg. In some cases, a meniscal injury is suspected after a dog has had cruciate surgery but continues to show discomfort. The presentation can vary: some dogs show subtle stiffness, others a more obvious limp. This page explores the patterns that may suggest a meniscal problem, what happens inside the joint when the cartilage is compromised, how clinicians investigate the stifle to identify meniscal damage, and the range of surgical and non-surgical approaches that exist. The aim is to help you understand what a meniscal injury involves and how it is typically managed.
Why this matters now
Meniscal injury in dogs tends to occur most commonly in middle-aged and older animals, particularly in medium to large breeds such as Labrador Retrievers, Rottweilers, and German Shepherds. The injury often appears alongside or following cruciate ligament damage, as the loss of stability in the stifle can place abnormal forces on the meniscal cartilage. In some cases, meniscal tears develop independently, particularly in dogs with degenerative joint changes or those who have experienced sudden twisting movements during activity.
The course of a meniscal injury can vary considerably between individuals. Some dogs show a sudden onset of lameness following a specific incident, whilst others develop signs gradually as the cartilage frays or tears over weeks to months. In dogs with concurrent cruciate disease, meniscal damage may occur at the time of the ligament injury or develop later as the joint continues to move abnormally. Left unaddressed, the mechanical disruption inside the joint often leads to persistent discomfort and may contribute to ongoing inflammation and cartilage wear.
Signals & patterns
Early signals
Audible click or pop
Some owners hear a distinct clicking, popping, or snapping sound when the dog walks or stands, often corresponding to weight-bearing on the affected limb. This noise can reflect a torn fragment of meniscus catching or flipping as the joint moves.
Intermittent weight-bearing reluctance
The dog may hold the leg slightly off the ground or shift weight away from the affected limb, particularly when standing still or after rest. This pattern often comes and goes, improving with gentle movement and worsening after periods of inactivity.
Subtle shortening of stride
An attentive owner may notice that the dog takes slightly shorter steps with the affected leg, or that the limb does not fully extend during walking. The gait may appear mildly uneven, though the dog continues to use the leg.
Reluctance to turn tightly
Dogs with early meniscal discomfort may hesitate before turning in a tight circle, particularly in the direction that loads the injured stifle. This can be subtle, appearing as a slight pause or shift in movement rather than outright refusal.
Sudden worsening after a period of improvement
In a dog already being managed for cruciate ligament disease, or one recovering from cruciate surgery such as a TPLO, a meniscal tear often shows itself as a sudden increase in lameness after a period of steady improvement, rather than as a gradual change. This shift — from improving to abruptly worse — is one of the more informative patterns, since it points to a new problem inside the joint rather than the expected course of healing.
Later signals
Persistent or worsening lameness
As the injury progresses, lameness may become more consistent, present even during slow walking or after minimal activity. The dog may avoid placing full weight on the limb or show an obvious limp that does not improve with rest.
Visible muscle loss
Over time, reduced use of the leg can lead to noticeable thinning of the thigh muscles on the affected side. This asymmetry becomes more apparent when comparing both hind limbs, particularly when viewed from above or behind.
Stiffness after lying down
Dogs with established meniscal injury often show marked stiffness when rising from rest, taking several steps to warm up before the gait smooths out.
Click to read about the biological mechanisms
How this is usually investigated
Investigation of a suspected meniscal injury typically begins with a detailed history of when the lameness started, whether there was a specific incident, and how the signs have progressed. Physical examination of the stifle follows, often including manipulation to assess stability, range of motion, and the presence of joint effusion or audible clicks. As the picture develops, imaging may be used to rule out concurrent problems and, in some cases, to visualise the soft tissues directly.
Physical examination and manipulation
Radiography
Arthroscopy
Magnetic resonance imaging
Synovial fluid analysis
Options & trade-offs
Management of a meniscal injury is typically shaped by the severity of the tear, the presence of concurrent cruciate disease, the dog's age and activity level, and what the owner finds workable in their circumstances. In many cases, a combination of approaches is used, and the balance may shift over time as the dog's needs change. Different animals and households find different combinations sustainable, and there is rarely a single path that suits everyone.
Partial meniscectomy
The damaged portion of the meniscus is removed surgically, either through an open incision or via arthroscopy, leaving the healthy cartilage in place to continue its role in load distribution. This approach aims to eliminate the mechanical interference caused by torn fragments whilst preserving as much functional tissue as possible. The procedure is often performed at the same time as cruciate surgery if both conditions are present.
Trade-offs: Removing part of the meniscus reduces the cushioning available in that area of the joint, which may contribute to degenerative changes over the longer term. Recovery involves a period of restricted activity, and some dogs experience ongoing low-grade stiffness even after the acute discomfort resolves.
Meniscal release
The caudal horn of the medial meniscus is deliberately cut to prevent it from becoming trapped or torn in the future, particularly in dogs undergoing cruciate surgery where the risk of subsequent meniscal injury is high. This is a preventative measure rather than a repair, intended to reduce the chance of a later lameness episode that would require a second operation.
Trade-offs: The technique sacrifices some of the meniscus's stabilising and shock-absorbing function in exchange for reducing the risk of a displaced tear. Not all surgeons favour this approach, and it is typically considered only in cases where the meniscus is at particular risk of injury due to ongoing instability.
Medical management and rehabilitation
For dogs with mild meniscal damage or those where surgery is not an option, management may focus on controlling inflammation with anti-inflammatory medication, maintaining muscle strength and joint mobility through controlled exercise and physiotherapy, and modifying activity to reduce the forces acting on the joint. Weight management often forms part of this picture, as excess load can worsen cartilage wear.
Trade-offs: This approach does not remove damaged tissue or restore normal joint mechanics, so mechanical symptoms such as clicking or catching may persist. Some dogs remain comfortable with this combination, whilst others show progressive lameness or stiffness that limits their quality of life over time.
Cage rest and observation
In cases where the diagnosis is uncertain or the lameness is mild and recent, a period of strict rest may be used to see whether the signs resolve or stabilise. Activity is restricted to short, controlled movements, and the dog is monitored for changes in gait, clicking sounds, or the degree of weight-bearing.
Trade-offs: Rest alone does not address a mechanical tear, and if a displaced fragment continues to interfere with joint movement, the lameness often persists or recurs once activity resumes. This approach can be useful as a short-term measure whilst gathering information, but it is rarely sufficient as a standalone solution for significant meniscal damage.
Multimodal pain and inflammation control
A combination of non-steroidal anti-inflammatory drugs, nutritional joint supplements such as omega-3 fatty acids, and sometimes adjunctive therapies such as acupuncture or hydrotherapy are used to manage discomfort and support joint health. A separate option is a course of pentosan polysulphate injections (available in the UK as Cartrophen Vet or Zydax)—a prescription-only medicine given by a veterinary surgeon rather than a supplement—which is used with the aim of slowing degenerative change within the joint. The aim is to reduce the inflammatory response inside the joint and maintain function for as long as possible.
Trade-offs: These measures address symptoms and may slow the progression of degenerative change, but they do not repair torn cartilage or remove mechanical obstruction. Response varies between individuals, and some dogs find little benefit whilst others show meaningful improvement in comfort and mobility.
Common misconceptions
"A clicking sound in the stifle always means the meniscus is torn."
Whilst an audible click during movement can indicate a displaced meniscal fragment catching on bone, other structures in and around the joint can produce similar sounds, including tendons moving over bony prominences or gas bubbles within the synovial fluid. Not every click is pathological, and some dogs with confirmed meniscal tears do not produce an audible sound at all. The click is one piece of information among many, rather than a definitive sign.
"If the meniscus is damaged, the entire structure must be removed."
Modern surgical approaches tend to remove only the damaged portion of the meniscus, leaving healthy cartilage in place to continue distributing load and stabilising the joint. Complete meniscectomy, which was performed more commonly in the past, is now less favoured because it can accelerate degenerative changes. The goal is to preserve as much functional tissue as possible whilst eliminating the source of mechanical interference.
"Once the torn piece is removed, the stifle will return to normal."
Removing damaged meniscal tissue can resolve the acute mechanical symptoms such as clicking or locking, but it does not restore the joint to its pre-injury state. The underlying factors that led to the tear—such as cruciate instability or degenerative cartilage changes—often remain, and some degree of ongoing inflammation, stiffness, or progressive wear is common over time. Many dogs show substantial improvement, but expectations of a return to completely normal function may not align with what the joint can achieve.
Related conditions
Cruciate Ligament Disease in Dogs
Meniscal injury occurs most often in dogs with cruciate ligament disease, because the instability created by a torn cruciate ligament places abnormal stress on the meniscus during weight-bearing. In some cases, a meniscal tear is discovered months or years after a cruciate injury, or during surgery to address cruciate damage.
Luxating Patella in Dogs
Both meniscal injury and patellar luxation involve abnormal mechanics within the stifle joint. In dogs with long-standing patellar luxation, the altered alignment and movement of the kneecap can change how forces are distributed across the joint, occasionally contributing to wear or damage of the meniscal cartilage over time.
Immune-Mediated Polyarthritis
Immune-mediated polyarthritis and meniscal injury can both present with lameness and discomfort in the stifle, though their origins differ entirely. A dog with sudden-onset joint pain involving multiple limbs may prompt consideration of immune-mediated disease, while isolated stifle lameness with a mechanical click often points toward a meniscal problem.
Septic Arthritis
Septic arthritis of the stifle is an important differential when a dog shows persistent lameness after stifle surgery, including procedures to address meniscal injury. While meniscal damage typically causes mechanical signs such as clicking, infection within the joint produces warmth, swelling, and sometimes systemic signs that help distinguish the two.
Panosteitis
Panosteitis is a self-limiting bone condition of young, growing large-breed dogs, typically appearing between about five and eighteen months of age, in contrast to meniscal injury, which tends to affect older dogs and often accompanies cruciate ligament disease. The two can both cause hind-limb lameness, but panosteitis often shifts from one leg to another and responds to pressure over the long bones, whereas meniscal injury usually remains localised to one stifle and may be accompanied by joint noise or mechanical catching during movement.
If your dog is showing lameness or discomfort in the stifle, understanding the possible involvement of the meniscus can help frame conversations about investigation and the range of management options available. The Pain & Mobility pillar includes related conditions such as cruciate ligament disease and osteoarthritis, which often overlap with meniscal injury and may inform the broader picture of what is happening in the joint. Thinking through what trade-offs feel workable in your circumstances—between intervention and observation, or between short-term recovery and longer-term joint health—can be a useful part of the process.
Last reviewed: 13 September 2026 · Dr Alastair Greenway MRCVS