A torn anterior cruciate ligament can make the knee unstable when turning, landing, or changing direction. Reconstruction is not necessary for everyone; the decision depends on how often the knee gives way, associated injuries, and the activities you want to resume. This guide explains non-surgical treatment and reconstruction, preparation, and returning to everyday life. It focuses on primary reconstruction; a meniscus repair performed at the same time can change the plan for the first few weeks.
🦴 What is the ACL, and when does a tear need surgery?
The anterior cruciate ligament, or ACL, connects the thigh bone to the shin bone in the centre of the knee. Together with other ligaments and muscles, it limits unwanted forward movement and rotation of the shin. Injury often occurs when changing direction or landing with the foot planted, although a direct impact can also cause it. A sudden popping sound, swelling, and later giving way are common signs; absence of one of these does not rule out a tear.
The menisci are two crescent-shaped tissues between the knee bones that distribute pressure. An ACL tear may occur with a meniscus or cartilage injury. Pain along the joint, catching, or an inability to straighten the knee needs assessment; these symptoms cannot all be attributed to the ligament alone. Examination and imaging together clarify the injury and the treatment options.
Non-surgical treatment aims to reduce swelling, restore movement, and improve muscle strength and knee control. Some patients gain a stable knee for daily activities through this approach and do not need surgery. Reconstruction is more likely to be needed when the knee still gives way despite appropriate rehabilitation, when returning to pivoting sport is the goal, or when there is an important associated injury. The choice depends on your goals and function, rather than just the word “tear” in an MRI report.
Reconstruction creates a new ligament from a tissue graft to improve stability. It does not guarantee that all knee pain will disappear or that arthritis will never develop. Rehabilitation before and after surgery is a central part of treatment; if you cannot make time for it, discuss this before setting a surgery date. The plan should fit your work, sport, and ability to exercise.
⏳ What happens if you do not have surgery?
If rehabilitation has made the knee stable and it tolerates your intended activities, continuing non-surgical treatment may be reasonable. Choosing not to have surgery does not mean that the joint will inevitably be damaged. However, repeated giving way can increase the risk of new meniscus and cartilage injuries. While deciding, avoid situations that make the knee unstable, such as sudden turns or contact sport.
For a recent tear without a major associated injury, when surgery has been judged necessary, the American Academy of Orthopaedic Surgeons (AAOS) guideline favours earlier reconstruction. This recommendation does not apply to every tear or every swollen knee. Knee readiness, associated injuries, and your general health affect timing. Report a locked knee, a significant associated injury, or worsening function for earlier assessment.
Preserving the meniscus whenever repair is possible is a treatment goal. Retained healthy tissue helps distribute pressure, but repairability depends on the tear pattern and tissue quality. Repeated instability may worsen injury, yet surgery cannot be promised to prevent future deterioration in every patient. Make the decision using your knee’s current condition and realistic goals.
🏋️ Preparing for surgery
Preparation aims to bring you to surgery with less swelling, a knee that straightens as fully as possible, and better control of the front thigh muscle. A preoperative programme may help strength and function, but study results differ and faster rehabilitation is not guaranteed for every patient. Activities that cause giving way, locking, or increased swelling are unsuitable at this stage.
At the preparation visit, knee straightening, walking, and muscle strength are assessed. If the knee is still very swollen or stiff, reducing those problems and restoring movement come before adding weights or jumps. Continue exercises you have already been taught within a comfortable range; do not suddenly increase exercise to make up for missed days.
Clear slippery rugs and cables from your routes at home, and prepare somewhere to sit and rest. Learn to use crutches and stairs before surgery. Arrange help with shopping, transport, and housework. If a meniscus repair is possible, allow for greater restrictions during the first weeks when planning work and home life.
- Stop smoking; this can help tissue healing and reduce wound complications.
- Work with your doctor to manage blood glucose, blood pressure, and anaemia.
- The skin around the knee and shin should be healthy; show the surgeon any wound, pus-filled spot, or fungal infection.
- Obtain crutches and the postoperative knee brace (a medical support for the knee) beforehand, and arrange a companion for the overnight stay.
🏥 The day before surgery and the day of surgery
The sequence is similar in most centres: admission and changing into theatre clothing, checking vital signs and inserting an IV line, meeting the anaesthetist and signing consent, and the surgeon marking the correct leg. Site marking is a standard safety step; give a reminder if it has not happened. The surgeon usually discusses intraoperative decisions again, particularly those about the meniscus. You then go to the operating room, while your companion waits for the result.
- Fasting: For healthy adults having scheduled, non-emergency surgery, allow at least 2 hours between the last clear liquid, such as water, and anaesthesia, 6 hours after a light meal, and at least 8 hours after fatty food or meat. Milk is not a clear liquid. Diabetes, delayed stomach emptying, and some medicines may change the plan; your anaesthetist’s written instructions take priority.
- Medicines: Bring a complete list of the medicines, supplements, and herbal products you take. Daily medicines, particularly blood thinners and diabetes medicines, must be discussed with the surgeon and anaesthesia team beforehand; do not stop or add any medicine on your own.
- Bathing: Shower according to the hospital’s instructions, and do not shave the surgical area at home with a razor; small cuts can provide an entry point for infection.
- Bring: Identification and insurance documents, MRI and X-ray reports and discs, recent tests, a medicine list, crutches and the brace, loose trousers, enclosed non-slip shoes, and personal items for one night.
⚕️ How is the operation performed?
Spinal or general anaesthesia is chosen according to your health and the anaesthetist’s assessment. Spinal anaesthesia numbs the lower body, and you may also receive sedation. Pain control and any need for a nerve block are explained beforehand; the type of anaesthesia alone does not determine the outcome of reconstruction.
The surgeon examines the knee with a camera and narrow instruments. During reconstruction, a tissue graft replaces the damaged ligament. The muscles at the back of the thigh are called the hamstrings; the muscle at the front of the thigh is called the quadriceps. This clinic does not use one default graft for everyone: hamstring, patellar tendon, and quadriceps tendon grafts are common options. Activity, examination, the graft donor site, and your goals inform the choice; none is best for all patients.
Tunnels are prepared in the thigh and shin bones at the ligament’s attachment sites, and the graft passes through them. A special screw or button holds the graft while attachment and tissue adaptation develop gradually. Less pain does not mean the graft is ready for football or sudden turns; returning to these activities requires time and functional testing.
If the meniscus is torn, the aim is to preserve repairable tissue, particularly in young patients and athletes. If repair is not possible, only the damaged part is removed and healthy tissue is retained. Tear shape and quality influence the decision; age alone does not decide it. Simple and complex meniscus repairs have different rehabilitation plans.
In this clinic, an additional procedure on the outer side of the knee is considered with reconstruction for most athletes in pivoting sports, to improve rotational control. It uses a strip of tissue from the outer knee. According to the surgeon’s recorded decision, this usual lateral augmentation does not change the basic postoperative programme; restrictions caused by a meniscus repair are assessed separately.
After checking knee stability and movement, the incisions are closed and dressed, and you go to the recovery area for monitoring after anaesthesia. Consent discussions cover risks such as infection, stiffness, blood clots, and further graft injury. Understanding these risks helps informed decisions and appropriate follow-up; their existence does not mean they will happen to you.
🗓️ Recovery at a glance
The usual hospital stay in this clinic is one night. After ACL reconstruction without meniscus repair, walking with crutches and rehabilitation begin in the first days. All patients in this clinic receive a brace. If the meniscus is repaired too, the type of repair determines how much weight you can put on the leg and how far you can bend the knee; do not use the ACL reconstruction without meniscus repair plan for a meniscus repair.
Early goals are pain and swelling control, knee straightening, and recovering control of the front thigh muscle. Strength, balance, and activity-specific exercises are added later. For full instructions, read the guide to care and rehabilitation after ACL reconstruction and, if the meniscus is repaired, the guide for your type of repair.
🎯 Returning to everyday life: answers to 20 questions
1) How much pain will I have, and how long will it last?
Pain and swelling are expected during the first few days to about a week, then usually lessen. Mild discomfort may fluctuate during rehabilitation. Contact the clinic if pain does not start improving within a few days or is not relieved by your prescription.
2) How many nights will I stay in hospital?
The usual stay in this clinic is one night. Before discharge, the effects of anaesthesia should have worn off, pain should be manageable, and you should have learned to move with crutches. Your companion should also understand the medicine plan and how to help at home.
3) When can I put weight on the operated leg?
These names describe the shape or location of a meniscus tear: “vertical” here means a lengthwise tear following the curve of the meniscus; “radial” runs from the inner edge towards the outside; “root” is at or near the attachment to the shinbone; “horizontal” lies between the upper and lower parts of the meniscus. Your surgeon assesses whether the repair is stable; do not assign yourself to a group from a name in an MRI report or from having little pain. At discharge, ask your surgeon which weight-bearing and knee-bending plan applies to you. After reconstruction without meniscus repair, weight bearing as tolerated with crutches begins in the first days. A stable vertical meniscus repair adds no meniscus-related restriction on full weight bearing or movement. For radial, root, or horizontal repairs, this clinic’s plan is no weight bearing through the end of week 6, with knee bending limited to 90 degrees. Confirm the exact repair type at discharge; not every tear labelled “complex” necessarily belongs to the non-weight-bearing group.
4) How long will I need the brace and crutches?
Crutches are usually needed for 2–4 weeks without meniscus repair and 5–6 weeks with a repair. All patients in this clinic receive a brace. For planning, brace use after reconstruction without repair or with a stable vertical repair continues until around the end of week 4, and with a complex repair through the end of week 6; front thigh muscle control must also be adequate. A sports-support brace, called a functional brace, is considered for returning to sport. Stopping crutches depends on walking without a limp and good knee control as well as time. The repair names are explained in question 3; your surgeon must identify which group and plan apply to you.
5) When are the stitches removed?
Stitches are usually removed two to three weeks after surgery. The dressing stays on until the first visit unless it becomes wet, dirty, loose, or blood-stained earlier. Wound assessment and the type of stitches determine what care should continue.
6) When does physiotherapy start, and how long does it continue?
Simple exercises begin on day 1 and formal physiotherapy sessions on day 2. Physiotherapy may continue for about 2–6 months, while exercise and testing needed for sport may take longer. Progress is assessed through movement, strength, and knee control.
7) When can I drive?
In this clinic, driving is considered around 6 weeks after surgery for either knee. You must be able to perform an emergency stop without pain or delay and take no opioid or sedating medicine. A brace that interferes with pedal control is also incompatible with driving.
8) When can I return to desk or seated work?
Desk work usually resumes gradually during weeks 2–4. Pain should be controlled, with safe movement and rest breaks possible. Reduce working hours if commuting or sitting increases swelling.
9) What about standing or heavy work?
Standing work or work involving stairs is usually considered from months 2–3; after a complex meniscus repair, from month 3. Walking without a limp, no increase in swelling, and adequate strength are needed. Ladders, carrying loads, and uneven surfaces require more readiness.
10) How should I use stairs?
For everyday stair use, lead with the unaffected leg going up. Going down with a handrail and crutches after ACL reconstruction without meniscus repair or a simple repair, move the crutch first, then the operated leg, then the unaffected leg. During the non-weight-bearing phase of a complex repair, keep the operated leg off the step and forward; use your arms for support, moving the crutch first and then the unaffected leg.
11) How should I sleep?
Sleep on your back and avoid keeping the knee bent on a pillow for long periods. If you elevate the leg, support the calf and heel so the knee can stay straight. During the brace period, keep the brace fastened and the knee straight when sleeping too. Without repair or with a stable vertical repair, removal is considered around the end of week 4 with good front thigh muscle control; with a complex repair, use continues through the end of week 6. The repair names are explained in question 3; your surgeon must identify which group and plan apply to you.
12) When can I shower?
A short shower may be possible from 48 hours after surgery if the wound is dry and the waterproof dressing is intact and firmly attached. Do not direct a strong stream of water onto the dressing; if water gets underneath it, change it the same day. A shower chair and a helper reduce the risk of a fall during the first showers.
13) How should I pray?
Initially, pray on a chair or use a raised prayer tablet for prostration to reduce deep bending and getting up from the floor. After ACL reconstruction without meniscus repair, usual prayer and kneeling on a soft mat are considered from month 3; after meniscus repair, observe deep-bending restrictions through the end of month 4. Movement should be comfortable and stable; ask your religious authority about permissible alternatives.
14) When can I resume sexual activity?
Sexual activity is usually possible after 2–3 weeks, once the wound is closed and pain is controlled. Choose a position that avoids weight, twisting, or deep bending on the operated knee. After meniscus repair, bending and weight-bearing restrictions still apply; stop if pain or instability occurs.
15) When can I travel or fly?
For planning, postpone long uninterrupted journeys of around 3 hours or more during the first 3 weeks, and long flights during the first 6 weeks. Your individual clot risk, mobility, and blood-thinner prescription may require a longer wait. Travel with a companion and opportunities to stop and move; continue prescribed medicine as directed.
16) When can I start stationary cycling?
Without meniscus repair or with a stable vertical repair, low-resistance stationary cycling is usually considered around week 3 if you can pedal comfortably. After radial, root, or horizontal repair, plan stationary cycling after the end of week 6; you must be able to pedal comfortably and exercise without premature loading or an increase in pain and swelling. The repair names are explained in question 3; your surgeon must identify which group and plan apply to you.
17) When can I start running?
Without meniscus repair, light straight-line running is considered during weeks 8–10. After a complex meniscus repair, running may be possible from week 12 onward with the same starting criteria. Range of movement should be normal, pain and swelling minimal, and walking and shallow knee bends, or half-squats, free of pain and limping. These times describe clinic practice and do not by themselves give clearance; movement control must be adequate.
18) When can I return to football or pivoting sports?
This clinic does not permit return to pivoting sport before 6 months, and strength, function, and movement control must be tested. Your mental readiness to return, including confidence in your knee and fear of another injury, should also be assessed. Evidence has associated return after 9 months with a lower risk of a second injury; this association is not a guarantee of safety. Straight-line running or less pain does not establish readiness for competition and sudden direction changes.
19) What changes if the meniscus is repaired too?
Meniscus repair may limit weight bearing and knee bending, and delay some activities. A stable vertical repair adds no meniscus-related restriction on full weight bearing or movement. For radial, root, or horizontal repairs, this clinic’s plan is no weight bearing through the end of week 6, with bending limited to 90 degrees. In the complex-repair plan, running is considered from week 12 onward, and deep bending and twisting after the end of month 4. Removing damaged meniscus tissue is different from repairing it; know your exact repair type. The repair names are explained in question 3; your surgeon must identify which group and plan apply to you.
20) What is the risk of another tear, and how durable is the result?
A review published in 2016 reported graft re-tears of about 7% and ACL tears in the opposite knee of about 8%. Among athletes under 25 who returned to sport, the combined rate of a second injury to either knee was about 23%. Follow-up duration varied between studies, and these figures are not your personal probability. Completing rehabilitation, testing before sport, and continuing movement-control exercises are steps you can take to reduce risk.
✅ Your next step
Reconstruction makes sense when it can provide the stability your life or sport requires. Non-surgical treatment has a place for suitable patients, and rehabilitation is essential with either approach. Before surgery, clarify the graft choice, meniscus status, need for lateral augmentation, and time required for rehabilitation. This helps you enter treatment with realistic expectations and a plan that fits your life.
To discuss treatment options and prepare for surgery, call Dr Jalil Emad’s clinic on 0913 782 5207, or book an appointment online.
Read more about treatment methods on this page: ACL reconstruction.
Related guides: Post-operative care and rehabilitation: ACL Reconstruction Surgery: Postoperative Care and Rehabilitation · Service page: Knee Arthroscopy (examining and treating the knee with a camera)
This guide is for your education and preparation. Treatment is chosen after an examination, review of imaging, and discussion of your circumstances and goals.
📚 Scientific references
View scientific references
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- AAOS OrthoInfo: ACL Injury Does It Require Surgery? · www.orthoinfo.org
- Aspetar clinical practice guideline on rehabilitation after anterior cruciate ligament reconstruction · British journal of sports medicine · 2023 · pmc.ncbi.nlm.nih.gov
- Effectiveness of exercise prehabilitation before anterior cruciate ligament reconstruction on functional outcomes - a single-blinded randomized controlled trial · Scientific reports · 2026 · pubmed.ncbi.nlm.nih.gov
- Rehabilitation versus surgical reconstruction for non-acute anterior cruciate ligament injury (ACL SNNAP): a pragmatic randomised controlled trial · Lancet (London, England) · 2022 · pubmed.ncbi.nlm.nih.gov
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- ASA Practice Guidelines for Preoperative Fasting, Anesthesiology 2017;126:376–393 · www.asahq.org
- 2023 American Society of Anesthesiologists Practice Guidelines for Preoperative Fasting: Carbohydrate-containing Clear Liquids with or without Protein, Chewing Gum, and Pediatric Fasting Duration-A Modular Update of the 2017 American Society of Anesthesiologists Practice Guidelines for Preoperative Fasting · Anesthesiology · 2023 · pubmed.ncbi.nlm.nih.gov
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- KneeTech published ACL rehabilitation protocol · kneetech.co.uk
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- Simple decision rules can reduce reinjury risk by 84% after ACL reconstruction: the Delaware-Oslo ACL cohort study · British journal of sports medicine · 2016 · pubmed.ncbi.nlm.nih.gov
- AAOS OrthoInfo · Anterior Cruciate Ligament (ACL) Injuries · www.orthoinfo.org
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- Hull University Teaching Hospitals NHS Total Hip Replacement, updated31October2024 · www.hey.nhs.uk
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