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ACL Reconstruction Rehab Sydney | Return to Running Earlier

Run earlier and more safely after ACL surgery. Our Anti-Gravity Treadmill protocol allows running to begin from Week 8–10 — weeks earlier than traditional timelines allow.

Post-Surgical Return to Run Week 8–20 Knee Loading
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Why the Anti-Gravity Treadmill for ACL?

RUNNING EARLIER, SAFELY

One of the most significant challenges in ACL rehabilitation is the return to running. Traditional protocols often delay running until 12–16 weeks post-op — primarily because of the compressive and shear forces that running places through the healing graft and surrounding structures.

The Anti-Gravity Treadmill changes this. By reducing body weight by 40–70%, the ground reaction forces through the knee are dramatically reduced — allowing the movement pattern of running to be introduced weeks earlier, without the loading that creates risk. You train the neuromuscular pattern of running while the graft matures.

The video above shows a patient's first run after ACL reconstruction — performed on our BTL R-Force Anti-Gravity Treadmill at SportsFit Five Dock. This was a moment that would have been weeks away under a traditional protocol.

Before Starting the Protocol

CRITERIA BEFORE RUNNING BEGINS

Not every post-ACL patient is ready to begin anti-gravity running at Week 8. These criteria must be met before the protocol starts.

Full knee range of motion
Full or near-full ROM in both flexion and extension. Persistent extension deficit is a red flag that should be resolved before loading through running begins.
Minimal or no effusion
Significant swelling indicates the knee is not tolerating current loads. Effusion must be settling before adding the demands of running — even supported running.
Good single-leg control
Adequate neuromuscular control on the operated leg — single-leg squat, step-down, and balance performance all assessed before running is introduced.
Acceptable quad strength progression
Quad strength must be progressing before running loads are added. A significant quad deficit with early running creates asymmetrical loading patterns that increase re-injury risk.
The Protocol

ACL RETURN-TO-RUN PROTOCOL

Four phases from first supported jog to full ground running. Progression is criteria-based — not purely time-based.

01
Phase
Approx. Weeks 8–12 post-op
Supported Jog Introduction
50–70% body-weight support
Short jog intervals with walking breaks
Focus on relaxed, symmetrical movement
Monitor for swelling response post-session
02
Phase
Approx. Weeks 10–16 post-op
Running Capacity Build
30–50% body-weight support
Progress toward continuous jogging
Increase duration before increasing speed
Monitor cadence and avoid overstriding
03
Phase
Approx. Weeks 14–20 post-op
Pre-Ground Running
10–30% body-weight support
Continuous running with controlled pacing
Prepare neurologically for ground running transition
Avoid rapid speed or incline changes
04
Phase
Weeks 18–24+ post-op
Transition to Ground Running
Alternate supported treadmill and outdoor sessions
Progress based on swelling and symptom response
Full ground running when criteria met
Continues in parallel with broader ACL rehab program
Progression & Red Flags

CLINICAL DECISION RULES

These criteria guide progression through the protocol and identify when to regress.

Progression Rules
Progress When:
Running duration increased before reducing support percentage
No increase in effusion next day
Symmetrical running pattern maintained
Cadence stable and controlled
Red Flags
Regress If:
Effusion increases post-session
Loss of extension develops or worsens
Asymmetrical running pattern appears
Increased knee pain post-session
ACL Rehab Context
Broader Program
Anti-gravity running runs alongside strength rehab — not instead of it
Quad strength testing continues throughout
Full ACL rehab program available at sydneyaclphysio.au
Common Questions

FAQ — ACL & ANTI-GRAVITY RUNNING

When can I start using the Anti-Gravity Treadmill after ACL surgery?

Typically from Week 8–10, provided the key criteria are met — full ROM, minimal effusion, and adequate single-leg control. The exact timing depends on your surgical approach, graft type, and how your rehab has progressed. Book a free call and we'll give you a specific answer for your situation.

Does it replace my ACL rehab program?

No — the Anti-Gravity Treadmill is one component of ACL rehabilitation, not a replacement for a comprehensive program. It specifically addresses the return-to-running component. Strength training, neuromuscular rehabilitation, and sport-specific conditioning all continue alongside it. Our dedicated ACL rehab program is available at sydneyaclphysio.au.

Will it put stress on my graft?

Significantly less than ground running. At 50–70% body-weight support, the compressive and shear forces through the knee are substantially reduced. This is the point — allowing the movement pattern of running to be trained while the graft is still maturing, without the loading that creates re-injury risk.

Do I need a referral?

No referral needed. Book a free call and we'll assess your situation before your first appointment.

Get Started

READY TO START RUNNING AGAIN?

Book a free call. We'll tell you whether you're ready to start anti-gravity running and what the protocol looks like for your specific ACL rehab stage.

Book a Free Call

No referral needed · Five Dock, Inner West Sydney · Health fund rebates available

Inner West Anti-Gravity Treadmill — Five Dock

164 Great North Road, Five Dock NSW 2046  ·  (02) 8054 3775  ·  SportsFit Health & Rehab →

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