This page is awaiting validation. It does not replace a consultation or a programme adapted to your situation.
What does the anterior cruciate ligament do?
The ACL lies in the centre of the knee between the thigh bone and shin bone. It helps limit certain shifts and rotations. Other ligaments, the menisci and muscles also contribute to stability. This is why two people with an ACL tear can have different abilities.
Injury may occur during a pivot, landing or change of direction, sometimes without contact with another person. A noise or cracking sound does not establish the diagnosis. Posterior cruciate ligament injuries and injuries involving several ligaments need their own assessment; this guide is not their protocol.
Understand the picture
Stability comes from several elements
ACL
It limits certain shifts and rotations.
Other structures
Menisci and ligaments also contribute to stability.
Muscles and control
They are developed through gradual rehabilitation.
Which symptoms may appear?
Fairly rapid swelling, pain and difficulty continuing the activity are possible. Later, some people feel giving way during a pivot. Others walk reasonably well in a straight line while remaining limited in sports movements.
Early pain may settle before all abilities return. Swelling and muscle strength can also affect a sense of instability. Describe the exact situations to your professional. Do not attempt a pivot alone to test whether the ligament holds.
Chapter sources [2]
What should you do after the accident?
Stop the activity and avoid repeated attempts that provoke instability. Deformity, inability to bear weight, a cold or numb foot or severe pain needs urgent help. A very swollen knee after a twist should be examined promptly.
The professional will decide on protection, walking aids and investigations. A wrapped cold pack may sometimes provide comfort, without prolonged direct skin contact; it does not replace assessment. Do not use cold over impaired sensation or circulation without suitable advice.
How is the injury confirmed?
The history and stability tests contribute to diagnosis. Examination can be difficult early on if the knee is very painful or swollen, so a review may be needed. An X-ray looks for certain bone injuries. MRI can clarify the ACL and associated damage.
Results should answer care questions: the meniscus, cartilage, other ligaments, protection or surgical advice. Bring reports to your physiotherapist. Another diagnosis may change permitted weight-bearing and movement, even if an online programme has the same “after ACL injury” title.
Must the ligament always be reconstructed?
The decision depends in particular on giving way, associated injuries, desired activities and response to rehabilitation. Some people regain useful function without reconstruction. Others have persistent instability or goals involving pivots that lead to discussion of surgery.
Reconstruction usually uses a graft to replace the ligament’s role. It then requires substantial rehabilitation and carries risks. It does not guarantee return to the same sporting level or prevent all future osteoarthritis. Discuss the benefits, limitations and practical consequences of each option with your team.
What are the first rehabilitation goals?
According to your instructions, work aims to control swelling, regain straightening and bending, activate muscles and improve walking. These abilities can also be prepared before surgery. After surgery, graft type and associated procedures guide the early stages.
Manageable pain does not allow you to ignore a restriction. Ask for a written plan for crutches, weight-bearing and movement ranges. The Exercises page shows general movements; it does not replace prescribed exercises after reconstruction or protection for an associated meniscus repair.
How does strengthening progress?
The programme gradually increases thigh strength and the capacity of other useful muscles. It then includes control, balance and more demanding movements. Results are compared with your starting point, the sport’s needs and, where relevant, the other leg. That leg may also have lost capacity during time away.
The Aspetar guideline considers exercise the foundation after reconstruction while highlighting uncertainty around many details of dosing. No exercise or series of numbers therefore guarantees safety. The professional selects and reviews exercises according to your progress.
Chapter sources [6]
In everyday life
Prepare a return to sport
Regain the basics
Mobility, walking and swelling control.
Build abilities
Strength, running and preparation tasks using agreed criteria.
Return to real situations
Gradual training, confidence and assessment before full participation.
Chapter sources [6]
When can you return to running and then pivots?
Running, jumping and changing direction are different stages. Before running, the team considers mobility, swelling, strength and tolerance of preparation tasks. Time since surgery still matters for healing, but is not enough to decide alone.
Returning to a pivoting sport then requires more strength, control and preparation for repeated or unexpected movements. Confidence and apprehension are discussed too. Suggested guideline criteria partly rely on consensus: passing tests reduces uncertainty without guaranteeing that another injury will not happen.
Chapter sources [6]
How can you organise work and life at home?
Your job, stairs, journeys and available help change what you need. Desk work and work involving lifting or pivots require different abilities. Prepare a suitable return with the professionals involved rather than copying another patient’s date.
After surgery, keep your team’s contact details and instructions about the wound and medicines. Seek prompt advice for fever, spreading redness, leakage or a suddenly painful, swollen calf. Associated chest pain or breathlessness warrants a call to 112 in Luxembourg.
How can you follow progress over time?
Rehabilitation generally takes months and can be lengthy for a demanding sport. Partial training often comes before full participation. Goals should be concrete enough to show progress: walking, stairs, strength, running and then game situations.
Returning swelling, persistently limited straightening or giving way needs reassessment. A new injury should not be treated as simply a poor session. If progress stalls, the plan can be adjusted and the medical team contacted again. Finishing appointments should not leave you without instructions for continuing training.
Your questions
Can I walk with a torn ACL?
Some people walk without major difficulty after the early phase. This does not show whether pivots are safe or another injury needs protection. Follow weight-bearing instructions and have giving way assessed.
Chapter sources [2]
Does surgery prevent all osteoarthritis?
No. Reconstruction does not guarantee freedom from future osteoarthritis. The original injury, menisci and other factors contribute. Surgery is discussed according to your needs and stability, with an honest account of its limits.
Chapter sources [2]
Does nine months automatically mean return to sport?
No. A month on the calendar does not replace checking mobility, strength, swelling, movements and confidence. Your team considers healing, tests and the intended sport together.
Chapter sources [6]
Why am I afraid even when tests improve?
Confidence may return at a different pace from strength. Mention your apprehension. Situations that gradually become closer to your sport and suitable support may help; fear is not proof of a lack of willpower.
Chapter sources [6]
Sources and references
- [1] AAOS — Anterior cruciate ligament injuries
- [2] IQWiG — Kreuzbandriss
- [3] Assurance Maladie — Douleurs du genou : que faire et quand consulter ?
- [4] NHS BNSSG — Patellar tendinopathy : symptoms, load and exercises
- [5] HAS — Pertinence de l’imagerie en cas de gonalgie chez l’adulte
- [6] Aspetar — Rehabilitation after ACL reconstruction guideline (2023)
- [7] IQWiG — Rehabilitation nach einem Kreuzbandriss
- [8] NHS — Baker’s cyst
- [9] CGDIS — 112 Luxembourg
Text updated on
Medical review: awaiting Hasib Selimovic.