ACL injury needs
a measured plan.
Not every ACL tear needs surgery, and not every knee needs the same graft. This guide covers how the injury is assessed, when reconstruction is considered, and what rehabilitation genuinely involves.
What ACL reconstruction actually is
The anterior cruciate ligament is one of the main stabilisers inside the knee. It controls forward movement and rotation of the shin bone. When it tears, the knee can feel unstable during turning, pivoting and side-stepping.
A torn ACL does not heal back by being stitched together. Reconstruction replaces it with a graft — usually tissue taken from elsewhere in your own knee — positioned through small keyhole incisions and secured in bone tunnels. The graft becomes a new stabiliser as it heals over the following months.
The operation is the shorter part of the process. What determines the outcome is the months of structured rehabilitation that follow it.
Is reconstruction right for me?
An ACL tear is not an automatic indication for surgery. The decision depends on instability, the activities you want to return to, other injuries in the knee, age and your willingness to complete rehabilitation.
Reconstruction is often discussed if
- The knee gives way during turning, pivoting or changing direction
- You want to return to sport involving cutting, pivoting or contact
- Your work requires physically demanding or unpredictable movement
- There is an associated meniscus or cartilage injury needing treatment
- Instability continues despite a proper course of rehabilitation
- The knee has repeatedly given way, risking further damage
Non-surgical management may suit if
- The knee feels stable in your daily activities
- Your activities are mostly straight-line — walking, cycling, swimming
- The tear is partial and the knee tests stable on examination
- You are willing to modify activity rather than return to pivoting sport
- Rehabilitation has not yet been given a proper trial
- Other medical factors make surgery inadvisable at present
Injuries assessed alongside the ACL
ACL tears frequently occur with other injuries, and finding them changes the plan. This is why examination and imaging look at the whole knee rather than one ligament.
If the knee swelled within a few hours of a twisting injury, it deserves proper assessment even if walking is now possible. Early swelling often points to bleeding inside the joint.
Rehabilitation first, for everyone
Every ACL pathway starts with restoring movement and strength. The question is whether it ends there, or continues to reconstruction.
| Consideration | Rehabilitation alone | ACL reconstruction |
|---|---|---|
| What it involves | Structured physiotherapy, strength work, neuromuscular training, activity modification, possibly a brace | Arthroscopic graft reconstruction followed by an extended, structured rehabilitation programme |
| Best suited to | Stable knees, straight-line activity, people willing to avoid pivoting sport | Instability with pivoting demands, or associated injuries needing surgical treatment |
| Effect on instability | Muscle control can compensate well in many people | Aims to restore the mechanical restraint directly |
| Time commitment | Months of consistent rehabilitation | Surgery plus a longer, staged rehabilitation programme |
| Return to pivoting sport | Less predictable; repeated giving way risks further damage | The usual route where cutting and pivoting sport is the goal |
| Reversibility | Reconstruction can still be chosen later | Permanent change; revision surgery is more complex |
Operating on a stiff, swollen knee gives worse results. A period of “prehabilitation” to restore movement and quadriceps control before surgery is standard practice, not a delay.
What happens, step by step
ACL reconstruction is performed arthroscopically through small incisions. Graft choice and fixation are discussed with you beforehand.
Assessment & planning
Examination, stability testing and MRI confirm the tear and identify any meniscus or cartilage injury. Graft choice is discussed against your sport, age and anatomy.
Prehabilitation
Before surgery, swelling is settled and movement and quadriceps control restored. Operating on a stiff knee increases the risk of post-operative stiffness.
Anaesthesia
Spinal or general anaesthesia is chosen with the anaesthetist. Nerve blocks may be used for pain control afterwards.
Arthroscopic inspection
The whole joint is inspected through keyhole incisions. Any meniscus or cartilage injury found is treated at the same time.
Graft preparation and placement
The graft is prepared, bone tunnels are made in the femur and tibia, and the graft is passed through and secured under tension at the correct position.
Recovery and rehabilitation
Many people go home the same day or the next. Physiotherapy begins immediately and continues in structured phases for months.
Rehabilitation in phases
ACL recovery is the longest part of the treatment and progresses by achieving milestones rather than by counting weeks. Your physiotherapist sets the pace against criteria, not the calendar.
Settle swelling, regain straightening
The priority is a fully straight knee, controlled swelling and quadriceps activation. Crutches and a brace may be used as advised. Full extension early prevents lasting stiffness.
Restore bend and walking pattern
Range of movement is rebuilt, walking normalises, and strength work begins in controlled ranges. Support is reduced as control improves.
Build the foundation
Progressive strengthening of quadriceps, hamstrings, glutes and calf. Balance and single-leg control are trained deliberately, since this is where reinjury risk sits.
Reintroduce load
Running is reintroduced when strength and control criteria are met, followed by graduated agility, change of direction and sport-specific drills.
Cleared on criteria, not dates
Return to pivoting sport follows objective testing of strength, hop performance and movement quality — plus confidence. Returning too early is the single biggest risk factor for a repeat injury.
Fever, increasing wound redness or discharge, calf pain or swelling, chest pain or breathlessness, a knee that suddenly locks or cannot be straightened, or a new giving-way episode should be reported without waiting for the next appointment.
Honest expectations
ACL reconstruction is a common and well-established procedure, and most people regain a stable knee. It is not a guarantee of a return to the same level of sport, and the risks below are discussed before you consent.
Possible complications discussed before surgery
These are recognised risks rather than expected outcomes. Your surgeon will explain which are most relevant to you.
- Infection in the joint or wound
- Blood clots in the leg or lung
- Stiffness or loss of full movement
- Graft failure or re-rupture
- Pain or numbness at the graft donor site
- Kneeling discomfort with certain grafts
- Further meniscus or cartilage problems over time
- Anaesthetic and general medical risks
Reconstruction restores stability, but not everyone returns to their previous competitive level. Reinjury risk is highest in the first year and in those who return before meeting objective criteria. Rushing this stage is the most common avoidable mistake.
Preparing well makes recovery easier
With ACL surgery, preparation is unusually influential: the state of the knee going into surgery affects how it comes out.
Before surgery
- Complete prehabilitation — settle swelling and regain full straightening.
- Work on quadriceps activation; strength before surgery predicts strength after.
- Complete the pre-operative tests and medical clearance requested.
- List all medicines and supplements for your clinician to review.
- Stop smoking if you can; it affects healing.
- Arrange transport home and support for the first few days.
Set up for recovery
- Practise using crutches before surgery, especially on stairs.
- Prepare an ice or cold-therapy arrangement and a way to elevate the leg.
- Clear walkways and remove loose rugs.
- Set up a comfortable place to rest with the leg supported straight.
- Book your physiotherapy sessions in advance.
- Plan time off study, work or training realistically.
Which graft do you recommend for me and why? Is my meniscus involved? Do I actually need surgery for my activity level? What criteria will decide my return to sport? What is my realistic timeline?
Cost, insurance and what to ask
Costs depend on the hospital, whether the meniscus is also treated, the fixation implants used, day-care versus admission, and your insurance arrangement. Rehabilitation is a real and ongoing cost that is easy to overlook.
Ask for a written estimate covering theatre, implants, anaesthesia and stay — and separately ask how many physiotherapy sessions to budget for, since ACL rehabilitation runs for months. With insurance, confirm cashless approval and whether physiotherapy is covered.
Frequently asked questions
Does every ACL tear need surgery?
Which graft is best?
How soon can I return to sport?
Will my knee be normal again?
Is the surgery done by keyhole?
Can I have surgery immediately after the injury?
Do I need a brace afterwards?
What happens if I do nothing?
Can the graft tear again?
How important is physiotherapy really?
Your surgeon
Dr. Kapil Khare
Consultant Orthopaedic Surgeon & Joint Replacement Specialist
Practising at Fortis Hospital, Greater Noida, with a focus on joint replacement, arthroscopy and sports injury care. Consultations are structured around understanding your symptoms and goals before any treatment decision is made.
Next step
Bring your question to a considered consultation.
A consultation is not a commitment to surgery. It is a way to understand what is causing your symptoms, which options are reasonable now, and what each one would ask of you.