ACL reconstruction has been proven to be a very effective method of surgical treatment of symptomatic ACL instability. Traditional ACL reconstruction performed by using trans tibial method did have a slightly higher rate of late onset of arthritis as a result of non anatomic placement of the ACL. It is well known that anatomical reconstruction of the ACL reproduces the normal anatomy of the knee and thus results in complete and full stability and function of the knee. To reach the anatomic location on the femur, it is necessary to make an additional skin incision on the inner side of the knee – the accessory medial portal. If you make the femoral tunnel, with the knee at of 90Â° of flexion, the resultant tunnel length achieved is usually less than 30 mm. So in order to create a slightly longer femoral tunnel, it is necessary to drill the femoral tunnel in about 120Â° or 130Â° of flexion. This poses certain specific problems like:-
Is Joint Reconstruction Right For You?
- The vision may be obscured by the presence of a thick fat pad, which may then necessitate excessive fat pad resection.
- There may be inadvertent scuffing of the articular cartilage of both the medial femoral condyle as well as the patella.
- There is difficulty in visualization of the anatomic insertion point of the ACL on the femur.
Some of the disadvantages of the trans portal method of doing ACL reconstruction are:-
- Critically short sockets < 20mm
- Posterior or lateral wall blowout
- Inferior exit of wire laterally endangering soft tissues
- Iatrogenic chondral damage to MFC
- Difficult visualization of anatomy with hyper flexed position
- Bending of guide wire in hyper flexed position
- Difficulty with graft passage and fixation
(Lubowitz & Arthroscopy)
In order to overcome these difficulties, we use the Clancy flexible drill guide system. This consists of a flexible guide wire and flexible drill bits which can be utilized to undertake an ACL reconstruction by the anatomic method by keeping the knee at 90Â° flexion. This has several advantages:-
- There is no scuffing of the joint surface.
- You get a long femoral tunnel and this will enable you to use any form of fixation – aperture or a suspensorary, very easily.
- The tunnel that exists is much far away from the lateral collateral ligament and the peroneal nerve.
- Visualization is excellent since knee hyper flexion is not required.
- No offset guides are required to be used for tunneling, thereby reducing time and expense of instrumentation.
- There is less risk of bending of guide wires since the knee is at 90Â°