What is an ACL injury?
The anterior cruciate ligament (ACL) is a strong band inside the knee. It stops the shin bone from sliding forward and keeps the knee steady when you pivot or land. An ACL injury is a sprain or a partial or complete tear of that band.
It happens in sport with a sudden twist, a bad landing or a hard stop, though a hard fall can do it too. It can come with damage to the cartilage pad (meniscus tear) or to the inner ligament (medial collateral ligament (MCL) injury).
What does it feel like?
Some people describe a pop, followed by quick swelling within a few hours. The knee hurts, feels loose and may give way when you try to turn or take weight.
Walking in a straight line can feel fine after the first days, which is why some people think the injury is minor. The instability shows up later on stairs, on a slope or when changing direction.
In Ipoh it may happen on a badminton court after a lunge. It may also happen in a futsal match on a pivot, or on a wet trail at Bukit Kledang when the foot slips.
What should I do in the first days?
Look after the knee, then get it assessed. The first aim is to calm swelling and keep the movement and strength you have.
- See a doctor if the knee is very swollen, locked or cannot bear weight.
- Rest it from sport, and avoid twisting.
- Walk on flat ground within comfort, with a stick if you need one.
- Move the knee gently through its range, to keep it from stiffening.
- Keep the thigh muscles working with small, pain-free contractions.
- Book a physiotherapy assessment so the plan starts early.
Your doctor or surgeon’s instructions come first.
Will I need surgery?
The decision depends on how stable the knee is in daily life and what sport you want back. Your age, your work and any damage to other parts of the knee count too. The scan is part of the answer, not the whole.
Some people do well with rehabilitation. Others, particularly those who pivot in sport or whose knee keeps giving way, discuss reconstruction with an orthopaedic surgeon.
Either way, getting stronger first helps. If you do have surgery, read about ACL reconstruction rehabilitation.
What does a physiotherapist check first?
We ask what happened and how the knee behaves now. Then we examine the knee carefully.
We check:
- swelling, warmth and range of movement.
- stability tests for the knee ligaments.
- thigh, hip and calf strength.
- how you walk, step down and balance on one leg.
- how the knee feels during the movements of your sport.
If the tests point to a fracture or a locked knee, we arrange for you to see a doctor.
What does rehabilitation involve?
Exercise is the main part of rehabilitation. An international guideline on rehabilitation after ACL reconstruction names exercise as the key component. It finds little evidence on dose, and a large share of its advice rests on expert agreement [1].
That is why we judge progress by how your knee performs, not only by the calendar.
A plan moves through stages: calm the knee, regain movement, build strength, train balance and control, then add running, jumping and change of direction. See also return to badminton.
What can I do this week?
- Keep the knee moving gently, and avoid long periods of complete rest.
- Use the stair rail and take stairs one at a time.
- Avoid twisting, pivoting and sport until assessed.
- Do small thigh squeezes while seated, a few times a day.
- Sleep with a pillow under the calf, not under the knee, if the knee will not straighten easily.
When should I see a doctor first?
Go to the emergency department if the knee is very swollen straight after the injury, locked, cannot bear weight, or the leg looks out of shape. Go too if the calf swells and hurts.
See a doctor soon for any knee that gave way with a pop, so that a surgeon can examine it. Hospital Raja Permaisuri Bainun, Fatimah Hospital and Pantai Hospital Ipoh can arrange assessment and scans.
How do home sessions in Ipoh work?
A physiotherapist visits your house, examines the knee and starts a graded plan using your own stairs, floor and chairs. We teach exercises you can repeat daily, and progress them each visit.
Visits across Ipoh are available now, and our Canning Garden centre near Fatimah Hospital is opening soon. Prices are quoted on WhatsApp after a short description.
Read how home physiotherapy works and the wider page on knee pain.