Tibial Tuberosity Avulsion Fractures in Dogs

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An avulsion fracture occurs when a bone breaks and a fragment of the bone is separated by the pull of an attaching muscle, tendon or ligament. The tibial tuberosity is the prominent bump on the front and top of the tibia, the shin-bone, below the knee joint. This tuberosity attaches the patella (knee-cap) via a strong thick tendon of the quadriceps muscle group. A fracture of the tibial tuberosity often results in an avulsion fracture, by virtue of the pull of the quadripceps muscles.

This fracture tends to occur in younger dogs, before this area of the tibia has fully grown and fused to the rest of the bone. The fracture occurs in puppies in association with trauma, often falling from a height and landing with the knee in flexion, tearing the bone fragment from its normal position.

Untreated, the knee joint and consequently the limb function on the affected leg may be poor.

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In most cases, the fracture is the only medical problem and as such chest radiographs may not be necessary. There is no specific laboratory work for this type of fracture, but blood work may be obtained prior to surgical fixation and a general anesthetic.

Treatment

This type of fracture is probably best treated by surgery and fixing the bone back in its correct position; otherwise, the quadriceps muscle group may continue to pull the bone fragment away.

Fixation is achieved under anesthesia by cutting the skin, exposing the fracture site and fixing the displaced piece of bone in position using pins and/or wire. In some cases, if the displacement is minimal, or finances are limited, casting the leg with the knee extended for 2-3 weeks, may be effective.
X-rays will be taken after surgery to assess the position of the implants and the realignment of the bone.

Home Care and Prevention

After surgery, a soft padded bandage may be applied to the leg to reduce swelling and offer comfort and support. This may stay in place for a few days to a week. The toes at the bottom of the bandage will need to be checked daily for swelling or painBiocaine 4oz
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The incision, if visible, will need to be checked for swelling, redness or discharge and stitches or staples removed in 10 to 14 days from surgery.

If a cast has been used, the toes should be assessed in the same way as a bandage, but the top of the cast should also be checked regularly for rubbing or chaffing.

After surgical fixation, exerciseLaunch A Ball
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Implants, pins and wires, may be removed if they are felt to interfere with normal bone growth and lengthening, or left in place if they are not causing a problem and your pet has limited growing left to do.
The prognosis for this fracture is good but there may be damage to the growth region at the top of the tibia that might not be immediately visible on x-rays, yet lead to growth deformities in the leg that are more significant and difficult to treat.

The tibial tuberosity may fuse prematurely following the repair and this could alter the conformation of the knee leading to impaired knee function.

Tibial tuberosity fractures are usually caused by minor trauma in the home and are therefore difficult to prevent. Be careful not to drop small breeds of dogs when holding them while standing and do not encourage your petsStain and Odor Remover
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