For a long time, an ACL rupture meant one of two things: surgery, or giving up pivoting sports for good. That thinking is changing. Emerging evidence suggests some ACL ruptures may show signs of healing without surgery, using a non-surgical approach called the Cross Bracing Protocol. It is early days, and it is not right for everyone, but the research offers new hope and more options for a common and serious knee injury.
Can an ACL Rupture Heal Without Surgery?
Until recently, the answer was thought to be no. The ACL was believed to have very little capacity to heal on its own, which left surgery as the main route back to pivoting sport. A 2023 study published in the British Journal of Sports Medicine challenged that assumption, showing that a significant proportion of ACL ruptures displayed signs of healing on MRI when managed with a specific bracing and rehabilitation protocol. It does not mean surgery is never needed, but it does mean the conversation now has more than one option in it.
The Traditional View of ACL Ruptures
The anterior cruciate ligament, or ACL, is a key stabiliser of the knee, and a rupture is one of the more feared injuries in sport. For decades, the standard advice was reconstruction surgery for anyone wanting to return to sports involving twisting, pivoting or cutting. The alternative was to modify activity and live with a less stable knee. Because the ACL sits within the joint and has a limited blood supply, it was assumed the torn ends could not reliably reconnect. Newer evidence suggests that, in the right conditions, some can heal.
What Is the Cross Bracing Protocol?
The Cross Bracing Protocol was developed by Dr Tom Cross of Stadium Sports Medicine. In simple terms, the injured knee is placed in a brace locked at ninety degrees of flexion for four weeks, with the range then gradually increased over the following weeks. The idea is to bring the torn ends of the ACL as close together as possible, giving the body the best chance to bridge the gap and heal the ligament. It is a demanding protocol that requires close medical supervision throughout, and the bracing period is only one part of it.
What the ACL Rupture Study Found
The results were striking. Around ninety percent of participants showed signs of healing on MRI at three months, judged by continuity of the ACL on the scans. Roughly half showed a thickened ligament with minimal damage, while a further forty percent had an elongated but continuous ligament. Importantly, greater signs of healing on MRI were associated with better function, higher rates of return to sport, greater knee stability and improved quality of life. These are encouraging findings for a ligament long thought unable to repair.
The Risks You Need to Know
No protocol is without risk, and this one is no exception. Of the eighty participants, fourteen experienced a re-injury to the ACL, all after returning to sport. Two participants developed a deep vein thrombosis, a blood clot linked to the period of immobilisation, which was managed conservatively. These risks are a key reason the bracing protocol must be carefully selected and closely monitored by an experienced medical team, and why it is not suitable for everyone. Anyone considering it should discuss the risks and benefits with their doctor and surgeon.
Why Physiotherapy Is Central to Healing
It is easy to focus on the brace, but physiotherapy made up the majority of the protocol. In the first ten weeks, the aim was to support ACL healing while limiting muscle wastage and managing pain and swelling, then gradually restoring range, strength and proprioception. The following weeks reintroduced running, plyometrics and agility, before a structured strength and return to sport phase, all progressed against clear criteria rather than fixed dates. Guided ACL rehabilitation is what turns a healing scan into a functioning knee.
Is Non-Surgical Healing Right for You?
The Cross Bracing Protocol is promising, but it is still an emerging area, and it is not the right choice for every ACL rupture or every person. Factors such as the type and location of the tear, other knee injuries, your health, lifestyle and goals all influence whether it is worth considering. The decision should always be made with a sports doctor or surgeon, alongside a physiotherapist who can guide the rehabilitation. Our team can help you understand the options and work in with your medical team, and support your injury prevention once you are back.
Common Questions
Can Every ACL Rupture Heal Without Surgery?
No. The research shows that some ACL ruptures can heal with the Cross Bracing Protocol, but not all, and it is not suitable for everyone. Whether it is an option depends on the injury and the person, and it needs assessment by a sports doctor or surgeon.
How Long Does the Cross Bracing Protocol Take?
The full process runs over several months. The bracing phase lasts around the first four weeks with range gradually increased, and rehabilitation continues well beyond that, with return to sport typically considered from around six months onward if criteria are met.
Is the Cross Bracing Protocol Safe?
It carries real risks, including re-injury and blood clots linked to immobilisation, which is why it must be closely supervised by an experienced medical team. For the right person, under proper supervision, it can be a reasonable option to discuss with your doctor.
Should I Have Surgery or Try Non-Surgical Healing?
There is no single right answer. Both surgical and non-surgical paths can lead to good outcomes depending on the individual. The best approach is to weigh the options with your surgeon and physiotherapist, considering your injury, goals and circumstances.
How BeFit Can Help
At BeFit Training Physiotherapy, our physiotherapists support people through ACL injuries at our Edgecliff and Coogee clinics, whether the path is surgical or non-surgical. We work alongside your sports doctor or surgeon, guide your rehabilitation through every stage, and help you make an informed decision about your knee. Our wider physiotherapy and rehabilitation services cover you from injury through to return to sport. Every initial consultation runs for forty-five minutes, one-on-one, and no referral is required to book.
Book an appointment at BeFit Training Physiotherapy — no referral needed.
Edgecliff: (02) 9327 7749 | Coogee: (02) 7205 2805 | befittrainingphysio.com/book-now
Related Services
Learn more about our physiotherapy and rehabilitation, ACL injury rehab and sports injury prevention services in Sydney.
Further Reading
For more on your options after an ACL injury, see ACL Injuries: Surgical vs Conservative Management.
References
Filbay SR, et al. Healing of acute anterior cruciate ligament rupture on MRI and outcomes following non-surgical management with the Cross Bracing Protocol. Br J Sports Med. 2023.
Frobell RB, et al. A randomized trial of treatment for acute anterior cruciate ligament tears. N Engl J Med. 2010.
Australian Physiotherapy Association. Clinical guidelines. physiotherapy.asn.au.
