Lateral Extra-articular Tenodesis (LET) is an additional procedure that may be done during ACL reconstruction surgery. In this procedure, another tendon graft is inserted to reinforce the knee joint especially in cases where there is a high likelihood of redislocation after ACL reconstruction only.

The LET procedure involves the reconstruction or strengthening of the lateral part of the knee joint by using a tendon graft from the iliotibial band or the hamstring tendon. This additional graft is positioned at the side of the joint and serves as a secondary stabilizer, which reduces the possibility of the knee moving too much from side to side.

LET is commonly indicated for patients who have excessive looseness or instability in the lateral side of the knee, which may not be fully addressed by ACL reconstruction. LET is designed to enhance the strength and stability of the lateral structures of the knee thus helping prevent re-injury after ACL surgery.

However, it is crucial for patients to speak with their orthopedic surgeon about the advantages, disadvantages, and possible scenarios of LET to decide if it is suitable for them. Like any other surgical process, there are risks and postoperative concerns that need to be discussed.