Lameness (limping) in Cats

Overview of Lameness in Cats

Any decrease in an cat’s ability to bear weight on a limb(s) or a decrease in the normal mobility and function of a limb(s) can be considered to be a lameness. Lameness can be extremely subtle or profound, affecting one limb or several limbs. It can be intermittent or constant, worse in the morning, worse at night, worse after rest, worse after or during exercise. Many cat owners refer to lameness as “limping”.

There is no breed, age or sex predeliction for lameness in cats. Lameness may be associated with a traumatic event, such as being hit by a car, or it may develop gradually, as in a bone tumor in an affected leg. The underlying cause of a lameness may be life threatening or it may be detrimental to a good quality of life such as debilitating and painful arthritis.

What to Watch For

• Obvious inability to walk or run normally
• Reluctance to perform normal activity, like going up or down stairs
• Refusing to place any weight on a leg

Diagnosis of Lameness in Cats

• History and physical. Your veterinarian will take a detailed history with regard to the onset, duration and variations in the lameness. S/he will also carefully watch your cat stand, sit and walk, if your cat cooperates. Your veterinarian will also give your pet a general physical examination that includes a careful orthopedic examination.
• Neurologic exam. Not all lameness is due to orthopedic disorders. A neurological examination of the limb(s) may be suggested if your veterinarian believes the problem may lie at the level of the brain, spinal cord, nerves or muscles that they supply.
• Radiographs. Dependent on the physical examination findings, radiographs may be taken of painful or suspicious areas of a limb(s). Opposite limbs may also be X-rayed for comparison or where bilateral (both sides) disease is suspected.
• Other diagnostic tests may be performed such as joint taps (removal of joint fluid and evaluation of this material by a pathologist), ultrasound, CT, MRI, myelography (a dye study of the spinal canal), biopsy, and contrast radiography such as arthrography where dye is injected into a joint.

Treatment of Lameness in Cats

• Treatment may be as simple, such as rest for a few days for a minor tendon or muscle sprain, or it may be as involved as major orthopedic or neurologic surgery for severe hip dysplasia or an acute intervertebral disk extrusion.
• In some cases the exact cause of lameness may not be obvious. A period of exercise restriction and rest may be suggested, perhaps with an anti-inflammatory medication in order to see if the problem responds to such a conservative approach. Failure to respond may suggest a more serious problem that necessitates more detailed diagnostic tests.
• Surgical treatment will almost always necessitate postoperative hospitalization during which time your pet will receive analgesics (pain-killers) to ensure a smooth and comfortable recovery.

Home Care

Following a surgical procedure you will need to enforce a period of rest and restriction. This may not prove too difficult at first; however, in the case of many healing fractures, it will need to last at least six weeks, and your pet may not want to be restricted.

Some lameness problems may be treated with a cast, splint or soft-padded bandage. This will need to be kept clean and dry and, where appropriate, the toes at the bottom of the bandage should be checked daily for swelling, sweating or pain.

Follow your veterinarian’s instructions carefully with regard to medications such as antibiotics or anti-inflammatory drugs, and there may be a need for follow-up x-rays or a follow-up visit with your vet. If the lameness is resolving, gradually re-introduce exercise over a period of several weeks.

Preventive Care

Lameness problems arise during normal everyday activity. Severe injuries such as falling from a height or being hit by a car can be avoided by keeping your cat indoors.

In-depth Information on the Limping Cat

Causes of Lameness in Cats

Sudden causes of lameness are generally more easy to define. If your cat was completely normal before taking exercise and suddenly comes up lame, obviously something happened that created a gait abnormality. Trauma of some type is most likely, although this can be extremely variable.

• A thorn in a foot-pad can produce a sudden onset profound lameness.
• An insect sting or bite on an affected leg may prove more subtle and difficult to find, but can be equally affective at producing lameness.
• An overweight cat might jump down from a deck, landing awkwardly and damaging the ligaments supporting its carpus (wrist).

In all of these examples, the pet has gone from normal to abnormal within a short period of time, but this does not necessarily mean that defining the lameness is always easy. In some cases it is possible to hone in on the correct area, for example the knee, and from there, try to define the problem more accurately.

Sometimes cats will develop sudden onset lameness when the underlying problem has actually been around for some time. A cat with a low grade, partially torn cruciate ligament may suddenly progress to a full blown tear, but there can be chronic arthritis and soft tissue thickening of the joint suggestive of a more long standing problem. Some pets with bone tumors of the limbs can suddenly develop a severe lameness associated with a fracture of a bone at the site of the tumor. These fractures are often associated with more minor trauma, such as slipping on a kitchen floor, an incident that would not normally be thought of as causing a broken bone.

Sudden onset lameness may be the initial presentation associated with a variety of spinal disorders. Extruded disk material in the neck region can causes a profound, single front leg lameness, a so-called root signature, as can disk problems in the lumbo-sacral region of the spine. Disk disease and fibrocartilaginous emboli (FCE) can produce rapid onset weakness and clumsiness that can be misinterpreted as lameness.

Overt lameness of one or more legs may not be what an owner initially notices. It may be a reluctance to go up or down stairs, not eager to play, or just not acting as lively and bouncy as one might expect for a kitten.

Sometimes lameness due to an orthopedic disorder can be misinterpreted as a neurological disease. Cats with cruciate injuries to both stifles can find it extremely difficult to walk and when they do can appear to be weak and clumsy on their back legs, similar to cats with disk disease.

Diagnosis In-depth of Lameness in Cats

Careful history taking can be crucial in the diagnosis of many types of lameness. After noting your pet’s age, sex and breed and asking about general health issues, questions specific to the lameness may include:

a) How long has the problem been going on?
b) Is it getting better or worse?
c) Is it worse in the morning, worse at night, worse after rest, worse after play?
d) Does it wax and wane or remain constant?
e) Does your cat cry in pain?
f) Has it responded to any treatment?

Following a general physical examination your pet will be observed as he/she sits/stands in the examination room. For cats, this can be difficult if the cat chooses not to cooperate. Sometimes owners find it helpful to bring along home videos of their pet’s gait, particularly if the problem appears to come and go.

Orthopedic evaluation usually concentrates on examination of all four limbs, palpating the bones, muscles and joints for pain, swellings and decreased or abnormal ranges of motion. Your veterinarian may also focus on specific areas to look for certain causes of lameness in areas like the hip, elbow and stifle.

Your veterinarian will also manipulate the neck and palpate the spine along its length. If neurological disease is suspected a more detailed neurological examination will be necessary.

If an abnormality of bone or joint is detected on the examination, radiographs of that region may be taken. Radiographs are not always necessary, however, although they can be helpful to confirm a suspected diagnosis, to discover the exact diagnosis (say there is elbow pain but the exact cause could be one of several different problems with different treatment plans) or to give an owner a more accurate prognosis.

Sometimes, with more subtle problems, it is necessary to radiograph the opposite normal limb for the purposes of comparison. Radiographs may lead to a suspicion of a certain problem, but not definitive confirmation. In some cases, further X-rays of the same site, taken in another 4 to 6 weeks may be suggested, to see if the area of interest has changed or the lesion progressed after that time.

Radiographs may also suggest that other diagnostic tests are appropriate such as a biopsy or a joint tap. A joint tap involves the insertion of a sterile needle into a joint, with your pet either sedated or anesthetized. The fluid is evaluated to define the type of pathology present in the joint.

In certain challenging lameness cases, CT scans or MRI can be helpful, such as in the diagnosis of a subtle cruciate injury in the knee. Alternatively, arthroscopy, that is visualization of the inside of the joint using a small camera inserted into the joint, can be minimally invasive and allow diagnosis of certain joint diseases. This is a less invasive alternative to surgically opening the joint, and obviously there is less discomfort associated with arthroscopy.

Where neurological disease is suspected, specific diagnostic tests may include myelography, CT scan, MRI, and spinal taps.

On occasion, injection of a water-soluble dye into a joint, a procedure called arthrography, can be helpful to define the extent and shape of a joint. Problems of the biceps tendon that runs through a sheath in the shoulder joint can be demonstrated, in some cases, using this technique.

Use of bone scans has limited applications in the diagnosis of small animal lameness.

Most lameness problems do not produce a specific change that can be detected with routine blood work. However blood samples may be obtained where infectious or auto-immune causes are suspected, and in cases where an animal will undergo general anesthesia for surgical correction of the lameness.

Treatment In-depth

If conservative management, that is rest and the use of ant-inflammatory medications, is suggested, then it is imperative to adhere to the recommendations made by your vet. Many cases of lameness are caused by soft tissue injuries, like pulled muscles, ligament and tendon sprains and strains, and in most cases will not require specific diagnosis or treatment. But most cats will not limit their own exercise for a sufficient period of time to allow proper healing to occur. Exercising too fast and too hard after an inadequate period of rest can re-injure or exacerbate the problem.

Sometimes the conservative treatment approach is used as a test of the severity of the problem. If after a period of restriction the lameness has not improved, your vet will have to believe that his/her suspicions of a minor cause were not correct.

There are obviously a multitude of levels of surgical intervention dependent on the underlying cause of the lameness, the number of limbs involved and concurrent problems. For more minor procedures, a cat may be discharged the same day. In the case of multiple pelvic fractures, which may take many hours of anesthesia and surgical time to repair, a cat may be severely debilitated, needing intensive supportive care, intravenous fluids, intravenous or transdermal narcotics for alleviation of pain and indwelling urinary catheter. Such patients will require around the clock nursing care until they reach a point in their recovery at which their management can be performed at home.

Cats are marvelously resilient and durable creatures. Despite receiving highly invasive treatment options, such as a plate and screw fixation of a femur fracture, cats can be up and around the day after such surgeries, in many cases using the surgical leg almost 100 percent.

In cases where a lameness is caused by a bone tumor, necessitating an amputation, almost all cats are up and around the next day, invariably with a much improved attitude, because they are no longer carrying the painful tumor on the lame leg.

Follow-up Care for the Cat with Lameness

Restriction often lasts for four to six weeks and requires, in most cases, confinement to a single room, restriction from going up or down stairs and avoiding slippery surfaces such as tile, hardwood floors or linoleum. In some instances your vet may recommend cage or crate rest, which means the “single room” is replaced by a cage or crate. If this kind of restriction promises to prove difficult, then this problem should be discussed with your vet so that alternative treatment options may be adopted

Following many types of limb surgery, a soft-padded bandage may be placed on the leg to offer comfort, reduce some of the normal postoperative swelling, and provide some support. Because it is not possible to observe the surgical incision for any problems, it is imperative to check the toes on a daily basis for swelling, excessive heat or pain. If your pet is persistently trying to chew the bandage and is not behaving normally in any other respect, a bandage change might be helpful to evaluate the surgical site. Similar care would apply if a limb was in a splint or cast.

If your pet has a visible incision it should be checked daily for swelling, redness or discharge. Stitches or staples will need to be removed in 10-14 days following surgery.

Some cats just do not tolerate a bandage very well, despite the absence of complications at the surgical site. Elizabethan collars can be helpful in most instances, but in some cases the bandage should be removed if it becomes more trouble than it is worth.

In some instances, passive range of motion, particularly after certain surgical procedures like FHO, will be demonstrated at the time of discharge in order to maximize postoperative range of motion in a joint.

Follow-up visits with your vet will be important to re-evaluate the lameness or to assess the healing from surgical intervention. Further radiographs may be indicated at this time.

When lameness is due to a fracture, most fractures occur secondary to severe traumatic events and can therefore be prevented by keeping your cat indoors. Spaying or neutering your pet will reduce the tendency to wander that can lead to trauma and fractures.

Sometimes lameness is secondary to nutritional problems. Cats should be fed a carefully balanced diet to ensure a strong and healthy skeleton. In the case of “homemade recipes,” consult with your veterinarian so that vital minerals and vitamins for good bone development and maintenance are adequately provided.

Monitor your kitten’s growth, checking on limb length and straightness. If any bowing or abnormal curvature seems to be developing, consult with your veterinarian.

The number one nutritional disorder in small animals is obesity, a problem that can lead to, and exacerbate many causes of frontleg and hindleg lameness. Be sure to avoid obesity in your pet.

Finally, consult with your veterinarian at the earliest sign of a sudden onset of limb lameness.