What is revision ACL reconstruction?
Revision ACL reconstruction is surgery to rebuild the anterior cruciate ligament after a previous reconstruction has failed — whether from a re-injury, a graft that did not heal, or tunnels that were not ideally positioned the first time.
It is technically more demanding than a first reconstruction, because the surgeon must account for the previous graft, the old bone tunnels and any associated damage. With thorough planning, however, the great majority of patients regain a stable knee.
Who is it for?
Revision is considered when a reconstructed knee is unstable and limiting you, after the cause of failure has been understood:
- A graft re-tear from a fresh injury.
- Persistent instability despite the first reconstruction.
- Poorly positioned or widened bone tunnels.
- Active patients wishing to return to pivoting sport.
How the procedure works
Planning the revision
Detailed imaging — often including a CT scan — maps the old tunnels and any bone loss. Sometimes the revision is staged: a first operation fills the old tunnels with bone graft, and the new ligament is reconstructed a few months later once that bone has healed.
The operation
A new graft is chosen — frequently a different one from the first surgery — and the ligament is rebuilt arthroscopically through carefully positioned tunnels. Any associated meniscus or cartilage injury is treated at the same time.
The presence of old tunnels, scar tissue and previous graft material means revision surgery is planned in fine detail, and is sometimes done in two stages to give the best foundation for the new ligament.
Recovery timeline
Recovery follows the same principles as a first reconstruction, but is often a little more cautious.
Protect & settle
Crutches, swelling control and early exercises to restore extension and quadriceps activation.
Motion & strength
Full range of motion, weaning off crutches, and progressive strengthening.
Build, run & cut
Strength work, a graded return to running, then agility and sport-specific drills.
Return to sport
Criteria-based clearance using strength and movement testing — often slightly later than a first reconstruction.
Risks & outcomes
Outcomes after revision are good, though return-to-sport rates can be a little lower than after a first reconstruction, which is discussed openly beforehand. Risks — including infection, stiffness, further graft injury and blood clots — are uncommon and actively minimised through technique, prophylaxis and a full rehabilitation programme.
Common reasons are a new injury, a graft that did not fully heal, or tunnel position — identifying the cause is central to planning the revision.
Often yes, but where there is significant bone loss it may be staged in two operations a few months apart.