Revision ACL Reconstruction in Reading — Single-Stage and Two-Stage Surgery
Revision ACL surgery is performed when a previous ACL reconstruction has failed to restore stability or the graft has stretched, ruptured, or malpositioned. As a consultant knee surgeon based at Circle Reading Hospital, Mr Sam Nahas specialises in both single-stage and two-stage revision ACL reconstruction. Patients receive consultations within a week, rapid imaging, and a personalised surgical plan based on the condition of their knee and previous tunnels.

Common reasons for graft failure
Graft re-rupture due to trauma
Malpositioned tunnels from prior surgery
Hardware or fixation issues
Biological failure or poor graft incorporation
Associated meniscal or cartilage injury
Anatomical variation
Patients often describe recurrent giving way, pain, or loss of confidence in the knee during twisting or pivoting movements. These symptoms can be reliably corrected with a structured revision approach.
Single-stage vs two-stage revision ACL reconstruction
The decision between a single-stage or two-stage operation depends on the quality and position of the existing bone tunnels.
In a single-stage procedure, both the graft removal and new reconstruction are performed at the same time.
In some cases, the tunnels are too wide or poorly positioned, making it unsafe to place a new graft immediately. In these cases, Mr Nahas performs a two-stage reconstruction.
The two-stage process explained
The first stage involves bone grafting the old tunnel in the tibia (shin bone) and sometimes the femur. Mr Nahas often explains this with a simple analogy:
"If there's a hole in a wall where a screw once sat and you want to put up a new shelf, you can't just re-use the same damaged hole. You first need to fill it with polyfiller, let it harden, and then drill a fresh, strong hole for the new screw. ACL revision surgery follows the same principle — we graft the tunnel, let the bone heal, and then create a new, stable channel for the new ligament."
After the grafted bone has fully healed, typically a few months later, the second stage reconstruction is performed using the new, properly aligned tunnels.
Graft options for revision ACL surgery
Revision procedures require careful graft selection. Depending on previous grafts used, available tendons, and patient preference, options include:
Autograft (using your own tissue)
Allograft (using donor tissue from another person)
In some cases, particularly where previous grafts or tissues have already been used, an allograft may be the best option. All graft choices and their benefits are discussed with every patient in detail prior to surgery.
Advanced imaging for surgical planning
High-resolution MRI and sometimes CT scans are arranged to assess tunnel position and bone quality. This determines whether single- or two-stage surgery is required.
Patients benefit from rapid access to imaging — typically within a week of consultation.
Recovery pathway
The rehabilitation process after revision ACL reconstruction follows a similar timeline to primary ACL surgery.
Weight bearing
Same or next day in most cases
Physiotherapy
Begins straight away
Running
4 months
Return to sport
9–12 months (individualised)
Each patient follows a recovery pathway designed for safe healing and return to full activity. The recovery pathway is tailored to each individual's lifestyle and sporting goals. Recovery is criteria-based and not actually based on a fixed time. What this means is you are not allowed to progress to the next phase of rehabilitation if your knee or muscles are not ready. Each patient's timeline will differ depending on progress, and results are not guaranteed as per this timeline. These are approximate estimates.
Expertise in complex and revision knee surgery
Fellowship-trained, knee-only consultant
Regularly manages complex and revision ligament cases
Proven outcomes supported by registry data
Operates at Circle Reading Hospital, a centre of excellence for orthopaedic surgery
Experience working with professional athletes and demanding sport injuries
Self-pay pricing and rapid access
Patients can book directly for consultations within a week without a GP referral. Self-pay packages are available with transparent pricing.
Book a private revision ACL assessment in ReadingWhere surgery is performed
Revision ACL reconstruction is carried out at Circle Reading Hospital, with easy access from Berkshire, Wokingham, Henley, Oxford, Maidenhead, and Bracknell.