Surgery to treat lameness caused by Cranial Cruciate Ligament [CCL] trauma or disease is one of the most common orthopaedic operations in dogs.
There are two cruciate ligaments within the stifle [knee] joint which act in opposite directions to each other to counteract shearing forces between the Femur [thigh bone] and Tibia [shin bone]. When damage occurs to these ligaments, it is almost always the cranial ligament that is affected. The ligament can be torn by straining / twisting of the ligament during exertional exercise, but more commonly in the bigger breeds the ligament is gradually torn over a period of time - causing either continuous or intermittent lameness. It is now widely accepted that this is a 'disease' of the ligament rather than simple trauma. Unfortunately, once the ligament is damaged the gradual process of osteoarthritis [degenerative joint disease] will commence. Surgical treatment is designed to remove as much pain and lameness as possible and reduce the onset and severity of arthritis.
Currently there are a number of surgical techniques used to treat these cases. They can be divided into techniques that Do or DON’T involve osteotomies [cutting into the bones].
1. Without an osteotomy, can offer the Lateral Suture Technique which, after inspection of the menisci [cartilages] in the joint and removal of any damaged sections, involves placing a special HARD TYPE NYLON suture from behind the lateral fabella to a small hole drilled in the tibial crest. The concept of this repair is to stabilize the joint with the prosthetic suture by placing it in a similar direction and taughtness to the original cruciate ligament. Eventually the prosthesis will break, but by then there should be enough fibrosis around the joint for it to cope.
2. Osteotomy techniques are now many and include tibial plateau leveling osteotomy [TPLO], tibial tuberosity advancement [TTA], triple tibial osteotomy [TTO] and others. These operations are all designed to remove the shear forces on the joint thus alleviating pain and lameness. They are all more complex procedures and inevitably involve the risk of bigger complications, but usually give a much better outcome and quicker than lateral suture. Recently a variation of the TTA surgery has been developed called the Modified Maquet Procedure [MMP] using a Titanium Foam Wedge insert which is very exciting because the success rate higher and the complication rate is lower. We are now pleased to be able to offer this surgery and would recommend it as an appropriate surgical option for most cases. For more information contact us at our office.
So what is the Modified Maquet Procedure?
The Modified Maquet Procedure (MMP) is merely a more robust and simplified version of TTA surgery, relying on a novel implant material, Orthofoam, supplied as a pre-formed wedge which is used to advance and fix the tibial tuberosity, thus replacing the cage, fork and plate in current usage (see fig. 2).
Orthofoam consists of sintered titanium beads formed into a rigid, porous structure through which new bone can grow (fig. 3; click to enlarge). It can be pre-formed into any shape and provides a non-compressible scaffold to fill the bone void left by conventional TTA. In addition, Orthofoam’s inherently high coefficient of friction helps lock the wedge into position immediately. The associated saw guide also helps achieve accurate, consistent and reliable results. Moreover, rapid bone in-growth results in a robust construct within a few weeks of surgery. This in turn allows for an early return to full weight-bearing and facilitates intensive physiotherapy much earlier than with other techniques.
A further refinement of the MMP is the method of tibial advancement estimation. This relies on datum points located exclusively on the tibia, thus avoiding the necessity to radiograph the limb in 135˚ of flexion as directed previously; a difficult task to reproduce consistently (see fig. 4).
Without the necessity to apply a plate, fork, cage and graft to the bone, morbidity and surgical time is greatly reduced, aiding the speed of recovery, reducing the cost to the client and most importantly, lowering the risk of complications for the patient and speeding their recovery.
Don’t hesitate to contact us if you would like any further information on this technique or think you may have a suitable case.