A New Way
to Heal.
The Cross Bracing Protocol is an emerging approach to ACL injury — one that aims to let the ligament heal itself, without surgery.
For most of modern sports medicine history, a complete ACL rupture meant two options: surgery or conservative management without a ligament. The Cross Bracing Protocol (CBP) has introduced a third possibility — using a specific bracing approach in the acute phase after injury to create the conditions for the ACL to heal on its own. It's not suitable for everyone, and the research is still evolving. But for the right patient, at the right time, it's a genuine option worth understanding.
Book a Free CallThe Cross Bracing Protocol Explained
A brief, clear overview of what CBP is, how it works, and why it's generating interest in sports medicine circles.
The Cross Bracing Protocol was developed by researchers in Australia and is based on a straightforward biological principle: the ACL, unlike many other ligaments in the body, has a poor blood supply — which is why it traditionally doesn't heal after a complete rupture. However, research has shown that in the acute phase after injury, the torn ends of the ligament remain in close proximity, and under the right conditions, healing may be possible.
The CBP uses a specifically positioned knee brace applied very early after injury — typically within the first few weeks — to hold the knee in a position that brings the torn ligament ends together and reduces tension on the healing tissue. The brace is worn continuously in the early phase, with the knee position gradually modified over time as healing progresses.
Alongside the bracing, a structured rehabilitation program is essential — restoring range of motion progressively, building strength, and eventually returning to functional activity. The brace is not the whole treatment. The rehab that runs alongside it, and follows it, is just as important.
It's worth being clear: CBP is not a guaranteed fix. Not every ACL will heal through this approach, and not every patient is a candidate. The protocol is most applicable to acute, complete ACL ruptures diagnosed and braced early. The research base is growing but still emerging — this is a genuine option, not an established standard of care.
The General Pathway
The CBP follows a structured sequence. Each phase requires clinical oversight — this is not a self-managed protocol.
Early Assessment & Brace Application
The protocol is time-sensitive. For CBP to be a viable option, assessment and brace application need to happen early — ideally within the first one to two weeks of injury, while the torn ligament ends are still in close proximity. An MRI is typically required to confirm the diagnosis, assess the nature of the tear, and determine candidacy. The brace is then fitted and positioned specifically for the protocol.
Controlled Healing Environment
During the bracing phase, the knee is held in the position prescribed by the protocol. Range of motion is restricted initially and gradually increased over the weeks that follow. Swelling management, quadriceps activation, and maintaining what range is permitted are the rehab priorities during this window. The brace does the mechanical work — the rehab maintains the surrounding structures.
Rehabilitation After Bracing
Once the bracing phase is complete, the rehabilitation that follows is similar in structure to post-surgical or conservative rehab — restoring full range of motion, rebuilding strength progressively, and working toward a functional return to activity. This is where we typically pick up CBP patients. Whether the ACL has healed sufficiently or not, the rehab priorities are the same: strength, symmetry, stability, and a criteria-based return to sport.
Has It Worked? What Comes Next?
After the bracing phase, imaging and functional assessment will indicate whether the ACL has healed. If it has — rehabilitation continues toward return to sport. If the healing has been partial or insufficient, the patient and their medical team will discuss next steps, which may include continuing with conservative management, or reconsidering surgery. Either way, the time spent in structured rehab is not wasted.
Who Is & Isn't a Candidate
CBP is not for everyone. Candidacy depends on several factors — the most critical being timing. If you're reading this weeks or months after your injury, the acute window may have passed.
Factors That May Support CBP
- Acute injury — assessed and braced within 1–2 weeks
- Complete ACL rupture confirmed on MRI
- No significant associated injuries (complex meniscus, cartilage)
- Motivation to comply with a demanding bracing protocol
- Access to appropriate clinical oversight throughout
- Preference to explore non-surgical options first
Factors That May Limit CBP
- Injury more than 2–4 weeks old — acute window may have closed
- Significant associated injuries requiring surgical attention
- Unable to comply with full-time bracing requirements
- Very high-demand pivoting sport with immediate return-to-play pressure
- Previous ACL injuries to the same knee
- Bony avulsion fractures or other structural complications
Candidacy for CBP should be determined by a sports medicine physician or orthopaedic surgeon with experience in the protocol, in conjunction with MRI findings. We can support the conversation and the rehab — but the decision about whether CBP is appropriate for you is a medical one, not a physiotherapy one.
Our Role in Your CBP Journey
"We're not the ones who fit the brace — but we understand what happens before it goes on, what happens while it's on, and what needs to happen after it comes off. That's where we add value."
During the Bracing Phase
We can support patients during the bracing period — managing swelling, maintaining quad activation within permitted range, keeping the hip and calf strong, and preparing the body for the rehabilitation that follows. You shouldn't be doing nothing while the brace is on.
Post-Brace Rehabilitation
Once the brace comes off, the real work begins. We run a structured, criteria-based program to restore full range of motion, rebuild strength, and progress toward return to sport — the same rigour we apply to post-surgical patients, adapted to the CBP context.
When CBP Wasn't Suitable
We've seen patients who attempted CBP but weren't appropriate candidates and needed to pivot to another pathway. If that's you — conservative management or preparation for surgery — we can pick up where things left off and build the right program from there.
Objective Testing Throughout
Regardless of the pathway, we measure everything — force plate strength assessments, limb symmetry index, hop tests, and functional movement quality. You'll always have objective data on where you stand and what needs to improve.
A Rough Timeline
Every CBP patient is different, but here's a general sense of how the pathway typically unfolds.
Injury, assessment & brace application
MRI confirms diagnosis. Candidacy assessed with your medical team. Brace fitted and positioned as per the protocol. Rehab begins immediately — swelling management, quad activation, and maintaining what range is permitted.
Bracing phase — progressive range restoration
The brace angle is modified progressively over this period. Rehab continues alongside — building hip strength, calf strength, and maintaining neuromuscular control within the constraints of the brace. This phase requires patience and compliance.
Brace removed — rehabilitation accelerates
Full range of motion restoration, progressive strength loading, return to walking and then light activity. Force plate assessments establish your baseline limb symmetry index. This is typically where we start working with CBP patients directly.
Strength, running & dynamic loading
Progressive gym-based strength work, return to running, plyometrics, and eventually field-based change of direction training. Timeline varies significantly based on healing response and individual starting point.
Return to sport — criteria-based, not time-based
Return to sport is guided by objective criteria — strength symmetry, hop test performance, movement quality, and psychological readiness — not by a calendar date. If the criteria are met, you're cleared. If they're not, we keep working.
FAQ
The research base is growing and the early results are promising — but CBP is still an emerging protocol, not an established standard of care. It shouldn't be presented as a guaranteed alternative to surgery, and the long-term outcomes data is still being gathered. What the research does show is that, for the right patients, ACL healing without surgery is a real possibility — not just a theoretical one. We'd encourage you to discuss the evidence with your surgeon or sports physician.
The earlier the brace is applied, the better — but whether the window has fully closed depends on your specific injury, how long ago it occurred, and clinical assessment. It's worth getting assessed promptly by a sports medicine physician or surgeon experienced in CBP. Don't assume it's too late without checking.
If follow-up imaging shows insufficient healing, you and your medical team will discuss next steps. For some patients that means continuing with conservative management — which is a valid path regardless of CBP outcome. For others it may mean reconsidering surgery, with the benefit of having now completed several months of structured rehab (which is excellent prehab). Nothing is wasted.
No — brace fitting and clinical oversight of the protocol itself should be managed by a sports medicine physician or orthopaedic surgeon experienced in CBP. Our role is the rehabilitation that runs alongside and follows the bracing phase. If you need a referral to someone who manages the bracing side, we can point you in the right direction.
Absolutely. We've had patients who explored CBP, found it wasn't suitable for their situation, and came to us for conservative or surgical rehab instead. Whatever path makes sense for you — we can build a program around it.
Standard conservative management accepts that the ACL won't heal and focuses on compensating for its absence through strength, neuromuscular control, and activity modification. CBP specifically aims to create conditions for the ligament to actually heal — it's not just managing without an ACL, it's attempting to restore it without surgery. The distinction matters because CBP requires a specific brace applied acutely, whereas conservative management can begin at any point after injury.
Considering Conservative Management Instead?
If CBP isn't the right fit, non-surgical conservative management is a legitimate alternative — and one we have significant experience with. Read about our conservative rehab approach and what that pathway looks like.
Not Sure Which Path Is Right for You?
Come in for an assessment. We'll talk through where you are, what your options look like, and how we can support whichever direction you take — surgical, conservative, or CBP rehab.
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