ACL Injury
The anterior cruciate ligament, usually shortened to ACL, is one of the two ligaments that cross inside the knee joint. At Modern Physio we focus on understanding the root-cause of your problem & personalizing your treatment for lasting results.
Understanding ACL Injury
The anterior cruciate ligament, usually shortened to ACL, is one of the two ligaments that cross inside the knee joint. Its job is to control forward movement and rotation of the shin bone relative to the thigh bone, which makes it central to any activity involving cutting, pivoting, landing or sudden deceleration. ACL injuries usually happen without contact, in the moment an athlete plants a foot and turns, lands awkwardly from a jump, or decelerates suddenly, and they are common in football, kabaddi, basketball, badminton and cricket, as well as in road traffic accidents and falls. Injuries range from a partial tear, where some fibres remain intact and the knee retains some stability, to a complete rupture, which frequently occurs alongside damage to the meniscus or the collateral ligaments. Many people describe hearing or feeling a pop at the moment of injury, followed by rapid swelling and a knee that feels unreliable when they try to turn on it. Management depends on the type of tear, the state of the rest of the knee, your age, and above all on what you need the knee to do. Some people, particularly those whose activities are largely straight-line, do well with structured rehabilitation alone; others, especially those returning to pivoting sport or with associated meniscal injury, are advised by their orthopaedic surgeon to consider reconstruction. Physiotherapy has a central role in both paths. It is the primary treatment in non-surgical management, and it is what determines the outcome before and after surgery when reconstruction is chosen. At Modern Physio in Jaipur, our physiotherapists work alongside your orthopaedic team to restore knee movement, rebuild strength and neuromuscular control, and guide a criteria-based return to activity. A suspected ACL injury should always be assessed by a doctor, as the decision about surgery is a medical one that physiotherapy does not replace.
Common Symptoms
- A popping sound or sensation inside the knee at the moment of injury, frequently reported after a twisting or landing movement
- Rapid swelling of the knee, usually developing within the first several hours rather than over days
- A feeling that the knee is unstable, gives way, or cannot be trusted when turning or changing direction
- Pain deep within the knee joint, which may be severe initially and then settle to a persistent ache
- Inability to continue the activity or match in which the injury occurred
- Difficulty fully straightening or fully bending the knee because of swelling and protective guarding
- Pain and reluctance to put full weight through the leg, often with a limp
- Visible wasting of the thigh muscles within a few weeks of injury, particularly the quadriceps
- A sense of the knee catching or locking, which may indicate an associated meniscal tear
- Reduced confidence and altered movement patterns during running, stairs, or squatting
- Recurrent giving way during daily activities in longer-standing untreated injuries
How Common Is It?
ACL injuries are among the most significant knee injuries seen in sports physiotherapy and occur most often in adolescents and adults involved in pivoting sports, with a well-recognised higher incidence in female athletes attributed to differences in landing mechanics, neuromuscular control and anatomy. In Jaipur they are seen regularly in footballers, kabaddi players and badminton players, as well as in people injured in road traffic accidents. Non-contact mechanisms account for the majority of cases, which is one of the reasons prevention programmes focused on landing and cutting technique have become a standard part of sports rehabilitation.
Causes & Risk Factors
- Sudden deceleration or stopping combined with a change of direction, which is the classic non-contact mechanism
- Landing from a jump with the knee relatively straight and collapsing inwards
- Pivoting on a planted foot while the upper body rotates in the opposite direction
- Direct contact or collision to the outside of the knee, forcing it inwards
- Poor neuromuscular control on landing, including limited hip and knee bend and inward collapse of the knee
- Weakness or imbalance in the hamstrings, quadriceps and gluteal muscles that stabilise the knee during high-load movements
- Fatigue late in training or competition, when landing mechanics and control deteriorate
- Playing surfaces and footwear that increase grip and prevent the foot from releasing during a turn
- A previous ACL injury or reconstruction, which increases the risk of injury to either knee
- Road traffic accidents and falls, which account for a substantial share of ACL injuries outside sport
Our Diagnosis Process
- A detailed account of the injury mechanism, including whether it was contact or non-contact, whether you felt a pop, and how quickly the knee swelled
- Assessment of swelling, joint effusion and the pattern of tenderness around the knee
- Measurement of active and passive knee range of motion, with particular attention to whether full extension can be achieved
- Specific ligament stability tests such as the Lachman and anterior drawer tests, together with pivot shift assessment where tolerated
- Examination of the collateral ligaments and meniscus, since ACL injuries commonly occur alongside other structures
- Strength testing of the quadriceps, hamstrings and hip muscles, compared side to side to quantify the deficit
- Functional and neuromuscular assessment appropriate to your stage, including gait, single leg control, and hop testing when safe
- Prompt referral to an orthopaedic surgeon for clinical review and MRI, which is essential for confirming the diagnosis and for the decision about surgical management
Our Treatment Approach
- Early management of swelling, pain and gait, with the immediate goals of restoring full knee extension and a normal walking pattern
- Quadriceps activation work from the outset, since the muscle shuts down rapidly after injury and this inhibition is one of the main obstacles to later progress
- Prehabilitation before surgery when reconstruction is planned, because entering the operation with a settled, mobile knee and good quadriceps strength is strongly associated with a smoother recovery
- Structured post-operative rehabilitation following the protocol set by your surgeon, progressed through clearly defined phases rather than by time alone
- Non-surgical rehabilitation for suitable patients, focused on building the strength and neuromuscular control that allow a knee without an intact ACL to function stably in daily activity
- Progressive strengthening of the quadriceps, hamstrings, calf and gluteal muscles, advancing from controlled open and closed chain work to heavier loading
- Balance, proprioception and neuromuscular training to restore the joint position sense that is disrupted when the ligament is injured
- Movement retraining for landing, deceleration and cutting mechanics, addressing the inward knee collapse that contributes to both the original injury and reinjury
- Manual therapy and soft tissue work to help restore full range of motion, particularly extension, and to manage post-operative scar and stiffness
- Graded return to running, then agility, then sport-specific drills, with each stage entered only once the previous criteria are met
- Objective return-to-sport testing including strength symmetry and hop test batteries, alongside assessment of psychological readiness, which is a recognised factor in reinjury
- Long-term maintenance and injury prevention programming, since the risk of a further ACL injury to either knee remains elevated after the first one
Key Highlights
Rehabilitation for both non-surgical management and pre and post-operative care
Close coordination with your orthopaedic surgeon's protocol and timelines
Criteria-based progression using objective strength and hop testing
Landing and cutting retraining to reduce the risk of a further injury
Recovery & Prevention Tips
- Get a suspected ACL injury assessed by a doctor promptly, as the decision about surgery depends on findings that require clinical examination and imaging
- Prioritise regaining full knee extension early, because a knee that cannot straighten fully creates problems that are difficult to correct later
- Take prehabilitation seriously if surgery is planned, since the strength and mobility you bring into the operation influence how the recovery goes
- Follow your surgeon's protocol on weight-bearing, bracing and range of motion limits rather than progressing faster because the knee feels good
- Expect rehabilitation to take many months, and treat the absence of pain as a poor guide to whether the knee is ready for pivoting sport
- Complete your home exercise programme consistently, as strength gains depend on regular loading rather than on clinic sessions alone
- Train both legs throughout, since the uninjured side also loses conditioning and is itself at increased risk after an ACL injury
- Address landing and cutting technique deliberately rather than assuming that strength alone will protect the knee
- Discuss your goals honestly with your physiotherapist and surgeon, because the demands of returning to competitive pivoting sport differ greatly from those of daily activity
- Continue a maintenance strength and neuromuscular programme after discharge, as reinjury risk stays elevated well beyond the point of return to sport
Products That Can Help
Supports and equipment we fit at the clinic that patients with this condition commonly use alongside treatment — never instead of it.
Frequently Asked Questions
Do I definitely need surgery for an ACL tear?
Not always, and the decision belongs with your orthopaedic surgeon after clinical examination and imaging. Reconstruction is commonly advised for people returning to pivoting sport, for younger patients, and when there is associated meniscal or multi-ligament damage. Some people with lower rotational demands manage well with structured rehabilitation alone. Physiotherapy plays a central role either way, but it does not substitute for a surgical opinion when the ligament is completely torn.
How long does ACL rehabilitation take?
Rehabilitation after ACL reconstruction is measured in months rather than weeks, and return to pivoting sport is typically considered at nine to twelve months or later depending on your surgeon's protocol and your test results. Non-surgical rehabilitation also takes several months to build adequate strength and control. Progression is driven by meeting objective criteria at each stage, not by elapsed time, because knees that look ready on the calendar are often not ready on testing.
What is prehabilitation and does it really matter before ACL surgery?
Prehabilitation is the physiotherapy done between the injury and the operation. Its goals are to settle the swelling, restore full range of motion, and rebuild quadriceps strength before surgery. This matters because the state of the knee going into the operation influences how quickly range of motion and muscle function return afterwards. A stiff, swollen knee with a weak quadriceps generally has a slower and more difficult post-operative course than a settled one.
Can physiotherapy help if I choose not to have surgery?
Yes. For suitable patients, a structured programme building quadriceps, hamstring and hip strength together with balance and neuromuscular control can allow a knee without an intact ACL to function well for daily activities and straight-line exercise. Success depends on your activity demands and on whether other structures in the knee were damaged. Your surgeon and physiotherapist should discuss this option with you together, including the implications for pivoting sport and for the meniscus over time.
When can I start running again after ACL reconstruction?
Running is usually introduced once you have full pain-free range of motion, minimal swelling, a normal walking pattern, and adequate quadriceps strength relative to the other side, which for most people falls somewhere around the third or fourth month post-operatively depending on the surgeon's protocol. The specific criteria vary, and starting before they are met tends to cause swelling and setbacks. Your physiotherapist will test these markers rather than working from the date of surgery alone.
How can I reduce the risk of injuring my ACL again?
The most effective steps are completing rehabilitation fully rather than stopping when the knee feels normal, passing objective strength and hop testing before returning to sport, and continuing a neuromuscular training programme afterwards. Landing and cutting retraining that addresses inward knee collapse is a core part of this, as is maintaining hip and hamstring strength. Reinjury risk to both the operated and the opposite knee remains elevated, so ongoing prevention work is worth continuing well beyond your return to play.
Medically Reviewed
This content was reviewed for medical accuracy by Dr. Surabhi Bansal, BPT, MPT (Ortho) with 14+ years of clinical experience.
At Modern Physio, all medical content undergoes a thorough review process to ensure accuracy and alignment with current physiotherapy standards. Our content is created to educate and should not replace professional medical advice. Learn more about our review process.
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Real Reviews From Our Patients
Verbatim reviews from patients treated at Modern Physio, sourced from Google and Practo.
Had a Grade 1 ACL injury in my knee, and on Day 1 I was not even able to stand properly due to the pain and instability. With Surbhi Bansal’s expert guidance, structured rehab plan, and constant support, by Day 6 I’m now walking easily and recovering really well. She is highly professional, explains every step clearly, and her behavior is extremely kind, supportive, and motivating. I’m genuinely impressed with the progress in such a short time and highly recommend her for physiotherapy and rehabilitation.
I had an ACL tear and underwent reconstructive surgery. For rehabilitation, I took treatment from Dr. Surabhi.which lasted for about three months. Thanks to her expert guidance, I’m now able to return to my normal activities.
Modern Physio is undoubtedly the best physiotherapist clinic in Jaipur. The atmosphere is welcoming, and the entire team is professional and caring. However, I want to give a special mention to Dr. Surabhi, whose expertise and compassionate …
I consulted Doctor Surabhi for my recurring ankle sprain (ligament issue) coming from sports. She treated it with electro therapy, IR and ultrasound. The results have been good so far and the swelling has gone. Now we are moving to the strengthening phase and she has given me a detailed one month plan before I get back to sports.