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ACL Revision: Causes, Surgery and Rehabilitation

ACL revision is a repeat surgical procedure on the anterior cruciate ligament following a previous reconstruction. It is required when the reconstructed ligament re-tears or the initial surgery was unsuccessful.

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Things worth knowing about "ACL Revision"

ACL revision is a repeat surgical procedure on the anterior cruciate ligament following a previous reconstruction. It is required when the reconstructed ligament re-tears or the initial surgery was unsuccessful.

What is ACL Revision Surgery?

ACL revision surgery (anterior cruciate ligament revision) refers to a repeat surgical procedure on the knee in which a previously reconstructed anterior cruciate ligament (ACL) is addressed again. The ACL is one of the primary stabilizing ligaments of the knee joint and is commonly torn during sports activities. When the initial reconstruction fails or the new graft is re-injured, revision surgery becomes necessary.

Causes of ACL Revision

There are several reasons why an ACL revision procedure may be required:

Re-tear of the graft: The replacement tissue (graft) can be torn again due to a new trauma or excessive loading.
Incorrect tunnel placement: If the bone tunnels were not optimally positioned during the initial surgery, long-term knee stability can be compromised.
Biological failure: Insufficient integration of the graft into the bone (poor osseointegration).
Persistent instability: Ongoing knee instability due to associated injuries that were missed or not treated during the first operation, such as meniscus tears or collateral ligament injuries.
Infections or complications: Postoperative infections or other complications may damage the graft.

Diagnosis

Before performing ACL revision surgery, a thorough diagnostic evaluation is carried out to identify the exact cause of failure:

Clinical examination: Tests such as the Lachman test or the anterior drawer test assess knee stability.
MRI (Magnetic Resonance Imaging): Provides detailed images of the graft, bones, and surrounding structures.
X-rays: Used to assess tunnel position and any bony changes.
CT (Computed Tomography): Allows precise analysis of bone structure and tunnel widening.

Treatment: The Revision Operation

ACL revision surgery is technically more demanding than the primary reconstruction and requires experienced knee specialists. Treatment is guided by the specific cause of failure.

Graft Selection

During revision surgery, a different graft is often chosen compared to the initial procedure. Common options include:

Hamstring tendons (semitendinosus/gracilis): Tendons harvested from the back of the thigh
Patellar tendon (Bone-Patellar Tendon-Bone, BTB): A well-established autologous graft option
Quadriceps tendon: Increasingly used in revision cases
Allograft (donor tissue): Tissue from a donor, particularly when autologous tissue is unavailable

Single-Stage vs. Two-Stage Approach

Depending on the extent of tunnel widening, the revision can be performed in one or two steps:

Single-stage: Graft replacement in a single operation when the existing tunnels are still adequate.
Two-stage: In the first step, tunnels are filled with bone grafts and allowed to heal; the actual revision reconstruction is then performed in a second operation.

Concomitant Procedures

Additional procedures are frequently performed alongside ACL revision surgery, such as:

Meniscus reconstruction or repair
Cartilage treatment
Lateral extra-articular tenodesis for additional rotational stability

Rehabilitation After ACL Revision

Rehabilitation following ACL revision surgery is lengthy and typically takes 9 to 12 months or longer. It includes:

Physiotherapy to restore range of motion, strength, and neuromuscular coordination
Progressive weight-bearing and loading
Sport-specific training before return to play
Regular medical follow-up appointments

The return-to-sport rate after ACL revision is somewhat lower compared to primary reconstruction; however, with consistent rehabilitation, a good functional outcome can be achieved in many cases.

References

Getgood A, Bryant D, Litchfield R, et al. - Lateral Extra-articular Tenodesis Reduces Failure of Hamstring Tendon Autograft Anterior Cruciate Ligament Reconstruction. The American Journal of Sports Medicine, 2020.
Kamath GV, Redfern JC, Greis PE, Burks RT - Revision Anterior Cruciate Ligament Reconstruction. The American Journal of Sports Medicine, 2011.
van Eck CF, Lesniak BP, Schreiber VM, Fu FH - Anatomic Single- and Double-Bundle Anterior Cruciate Ligament Reconstruction Flowchart. Arthroscopy, 2010.

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