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After an ACL reconstruction exercises
An ACL reconstruction replaces the torn ligament with a graft, usually taken from your own hamstring tendons or the tendon below the kneecap, threaded through tunnels in the bone and fixed in place. The operation restores the mechanical restraint. The outcome, though, is decided by a long and structured rehabilitation - typically nine to twelve months before a return to pivoting sport.
The graft is not at its strongest on day one. It is at its most vulnerable in the middle weeks and months, as the body remodels it, which is why the milestones are spaced the way they are and why the protocol is not something to run ahead of. Early rehabilitation protects the graft while restoring full straightening, settling swelling, and switching the quadriceps back on - it shuts down fast after surgery and is slow to return.
The early weeks are demanding and progress can feel slow, particularly in the second and third month when the knee feels fine for walking but is nowhere near ready for sport. Quadriceps strength is the single best predictor of how things end up, which is why so much of the middle phase is spent on it. The final phase adds power, hopping and change of direction, and tests readiness against objective criteria rather than the calendar.
This programme follows that arc as a general framework. Always work to the specific protocol and milestones set by your surgeon and treating physiotherapist, which take priority over any general plan, and tell them promptly if the knee swells sharply, locks, or gives way.
Who this programme is for
People recovering from ACL reconstruction surgery who are following their surgeon's rehabilitation protocol, at any stage from the first weeks after the operation to the final return-to-sport phase. It is a general framework to support that protocol, not a replacement for individualised post-operative physiotherapy.
Get checked by a clinician first if
- The knee locks and cannot be fully straightened - possible graft or meniscal problem, seek prompt review
- Calf pain, swelling, warmth or redness, or sudden breathlessness - seek urgent help to rule out a clot
- Wound that opens, leaks, or becomes increasingly red, hot and painful, with or without a fever
- A sudden pop, giving way, or rapid swelling after a twist or fall - seek assessment to check the graft
- The pain followed a significant accident, fall or direct blow and you have not been checked over
- You feel unwell with the pain - a fever, night sweats, or losing weight without trying
- The area is hot, very swollen and red, especially if you also feel feverish
- Pain that is severe, steadily getting worse, or keeps you awake every night and does not ease with a change of position
The staged programme
Stage 1
Early recovery
The first weeks. Restore full straightening, control swelling, reactivate the quadriceps, and regain a normal walking pattern within any brace or weight-bearing limits you have been given.
Stage 2
Build strength
From around 6 to 12 weeks. Progress double and single-leg strengthening, stationary cycling, and controlled knee extension work, building load steadily as the graft matures.
Stage 3
Power and control
From around 3 to 6 months, once strength is developing and roughly symmetrical. Add single-leg strength, balance on unstable surfaces, and progressive hopping and landing drills.
Stage 4
Return to sport
Return to pivoting sport is a shared decision with your surgeon and physiotherapist, usually not before 9 to 12 months. It is guided by criteria: quadriceps and hamstring strength within 90 percent of the other leg, a hop test battery within 90 percent symmetry, well-controlled landing and cutting, completion of a full return-to-training progression, and psychological readiness. Meeting the criteria matters more than the month.
How long recovery takes
Crutches are usually needed for 1 to 3 weeks, full straightening is expected by 2 to 4 weeks, jogging is often introduced around 3 to 4 months, and return to pivoting sport is typically 9 to 12 months, guided by testing. Strength and confidence continue to build into the second year.
Knowing when to progress
Follow your surgeon's protocol for the milestones. Protect the graft by respecting weight-bearing and brace instructions in the early weeks. From the strength phase on, use side-to-side symmetry as the main progression gauge, and do not begin cutting and pivoting drills until strength is close to matched.
Common questions
Why does it take a whole year?
The graft has to revascularise and remodel into a functioning ligament, which takes many months, and re-injury risk stays high until strength and control are fully restored. Returning before around 9 months, or before meeting criteria, sharply raises the chance of a re-tear.
When can I drive?
Usually around 4 to 6 weeks for an automatic car if the right leg was operated on, or sooner for the left leg, provided you can control the vehicle and perform an emergency stop. Check with your surgeon and insurer.
Is it normal for my knee to still feel different months later?
Yes. Some stiffness, occasional swelling after hard sessions, and a feeling that the knee is not quite your own are common through the first year and usually fade. Persistent locking or giving way is not normal and should be reviewed.
How do I lower the risk of injuring the other knee?
Complete criteria-based rehab, keep training both legs equally, and continue a maintenance programme of strength and landing control after you return. The other knee is also at raised risk in the first two years.
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