This is a surgical technique used to stabilize the stifle (knee) after a rupture of the Cranial Cruciate Ligament (CCL), which is analogous to the ACL in people. A CCL tear leads to an abnormal back-and-forth (tibial thrust) motion in the stifle which is painful to animals just as it is to people. The instability causes inflammation and the irregular motion on the joint structures causes premature osteoarthritis(OA) to develop at a rapid rate. Once OA has developed it can not be removed and remains for life. Additionally patients may tear a cartilage in the center of the stifle called the meniscus. There are two menisci in the stifle and typically the medial (inner) one tears which is painful and can cause a characteristic clicking or popping noise when walking. The menisci have a poor central blood supply and generally do not heal well, if at all. If your pet has a torn CCL they will usually be uncomfortable and manifest this as limping on the limb. They will often prefer to limit their own activity level due to the pain and thus be overall more sedentary. When a CCL tear is diagnosed, usually the best option is to stabilize the stifle surgically for the best outcome. One technique commonly performed for decades has been the Tibial Plateau Leveling Osteotomy (TPLO). The TPLO was designed to eliminate the tibial thrust motion that occurs with a CCL tear and thus return stability to the stifle for return to function. The TPLO procedure is very technical and thus is best performed by experienced surgeons. Initially the TPLO was only taught by the original designer of the procedure, Slocum Enterprises, and luckily Dr. House managed to complete this training program before it ended. To perform a TPLO procedure a bone cut (osteotomy) is made in the shin bone (tibia) near the knee. This cut is curved and allows a change in the angle within the stifle to alter the forces as mentioned above. Once the cut is made and the bone is rotated, a metal plate and screws are placed to hold the bone in its new position while it heals. These implants are usually left in place for life and are only removed if a reaction or infection should develop, which is generally uncommon. Since a cut is made in the bone for this procedure, patients must go through a rest period while the bone heals adequately for normal activity again. It is critical that patients rest to avoid breaking their bone or the implants. The post-operative instructions typically followed are below. If your pet has been diagnosed with a CCL tear, a TPLO may be recommended. This procedure is usually best performed in pets weighing 50 pounds and above. It can be performed in animals under 50 pounds, however, and this can be determined at a surgical consultation. Dr. House performs the TPLO procedure almost daily and would be happy to meet with you and your pet to discuss and perform the procedure accordingly at your local veterinary clinic.
Following the TPLO procedure a strict protocol must be adhered to in order for your pet to heal optimally. A successful surgical procedure is the initial part to a full return to function but without following the recovery plan correctly, your pet could have a poor outcome and could even necessitate future surgical treatment again.
Throughout the recovery period your pet should be restricted indoors when not being monitored. They should avoid going on and off furniture, such as beds and sofas. They should not play with other pets. They should not have the ability to run through your home freely, as a slip could happen or jumping at the door when the bell rings could cause serious injury. Stairs should be avoided. A sling may be used to assist when on stairs, but only minimal stairs should be used. When your pet is not supervised, they should be confined to a room or kennel where they can rest and will not harm themselves.
The first two weeks following surgery, your pet must be very limited in exercise on the leash. They may only be taken for short walks outside to relieve themselves on the leash, and then must return to restricted quarters indoors. During this timeframe pets should take their pain medications regularly for comfort. The post-operative swelling at the surgical site will improve faster if the medications are used as prescribed, but you may also aid in recovery by cold compressing the incision site. You may cold compress the region for 5-10 minutes every 8-12 hours for 3 days following surgery. Afterwards you may switch to warm compressing for up to 7 more days at the same duration and frequency. You may notice swelling around the hock (ankle) region several days after surgery. This is normal, and a result of gravity, and will resolve on its own or with warm compressing if you wish to speed the process. Finally, during the first 2 weeks of recovery, the external incision site is healing and proper care is paramount to avoid infection and wound opening. An Elizabethan collar (E-collar) is provided and use is highly encouraged. It is critical to avoid letting your pet lick at their incision as only a few licks may instill bacteria into the surgical site and cause a superficial or deep infection. Should a deep infection occur, future surgery to remove the implants will be highly likely. Pets should have the E-collar on always, but should you take it off to feed them, it should be replaced afterwards and they should be watched when it is off. If you see signs at the incision site of progressive reddening, increased swelling or drainage, your should contact your veterinarian promptly. At 10-14 days following surgery your pet will recheck at their regular veterinarian for an incision check and staple removal. If the incision is healing normally, they may have the E-collar removed 2-3 days after staple removal.
Once the two week recheck has been completed, and the veterinarian is happy with your pet's recovery status, you may now start to perform longer leash walks. Walking on the leash can be done for 5-10 minute periods, 2-3 times daily. This will allow them to burn off energy accumulating from the indoor restriction, and is an important part to faster healing. Walking on the leg will build their muscle back, will increase the joint range of motion and stimulates their bone to heal. When they are not being walked, they should remain restricted inside.
At 8 weeks following surgery, your pet should return to their vet for x-rays. The x-rays are done to assess the bone healing process and to insure the implants placed have remained unchanged. Your pet's ambulation will also be assessed to insure healing is occurring as expected. Once this visit is completed, and your pet is doing well, you may then start increasing your leash walks duration and frequency for 4 additional weeks. By the 12 week timepoint after surgery, your pet's bone should be adequately healed to run and play like they used to! Remember that following the recovery process strictly is critical to healing well and that each patient may heal differently. If you ever have concerns about the recovery of your pet, please don't hesitate to ask. We all want your pet to heal well from their surgery and be happy and healthy again!
A patient walking 2 weeks after TPLO surgery.
A patient walking 5 weeks after TPLO surgery.
A patient walking 8 weeks after TPLO surgery.