by: Chin Yi Khern, Physiotherapist, Regis Wellness
Last updated: November 29, 2025
Anterior cruciate ligament (ACL) injuries are one of the most common forms of knee injuries. It accounts for more than half of all knee injuries. These injuries are common in both professional and recreational sports athletes. ACL injuries may be severe, with some ACL injuries requiring surgery.
Surgery for ACL injuries tends to be expensive and requires a significant rehabilitation period with dedicated physiotherapy at least for 6 months after the surgery.
An ACL injury is a common sports injury in Singapore as well. In a study published in 2017, the prevalence of ACL tears within a sports setting was recorded to be 87.1% and 87.5% for males and females respectively. Soccer, basketball, racquet sports such as badminton and squash, and volleyball were the sports that resulted in the most amount of ACL tears.
Non-sporting related ACL tears were attributed to falls, slips and traffic accidents.

The ACL holds the thighbone, shinbone, and kneecap together, controlling the back-and-forth movement of the knees. ACL injuries can be a sprain or a partial/complete tear of the ACL. Most ACL injuries happen during sports due to the sudden stops or changes in direction involved. When an ACL injury happens, you may feel a “popping” sensation in the knee, followed by swelling of the knee.
Some people may not experience the “popping” sensation in the knee when they suffer an ACL injury. Other common ACL injury symptoms include:
The following factors can increase your risk of developing an ACL injury:
ACL injuries can lead to health complications. These include:
Your doctor will assess the condition of your knee by conducting a physical examination, checking for swelling and tenderness. Any loss in your range of motion will also be checked for. Depending on the severity of your injury, additional imaging tests such as an X-ray, Magnetic Resonance Imaging (MRI) or ultrasound might be required to rule out other possible causes for your injury.
While sports injuries such as ACL injuries can sometimes be unavoidable, there are some steps that you can take to lower your risks of ACL injuries. Some ACL injury prevention tips for athletes include:
RICE Model of Self-care
Following the RICE model of self-care can help you to relieve pain and swelling immediately after an injury.
Medications
Anti-inflammatory pain-relieving drugs can help you alleviate symptoms of pain and swelling. Depending on the intensity of your pain, you may get prescriptions for stronger drugs, or even get a steroid injection into your knee for pain relief.
Knee Brace
For minor ACL injuries, the use of a knee brace while participating in sports can provide sufficient support for the injured knee.
Surgery
For more severe ACL injuries, such as a complete ACL tear, ACL tear surgery may be necessary. The damaged ACL is either repaired or replaced with a graft (usually taken from the patient’s own tendon). After the surgery, physiotherapy will be required to help you complete your rehabilitation and get back into shape. This rehabilitation period may take six months to a year.
Physiotherapy and Rehabilitation
Physiotherapy and structured post-surgical rehabilitation are essential for restoring knee movement, stability, and function after an ACL injury. This is especially important if you are an athlete who wants to return to training and competition safely and confidently.
The rehabilitation process typically takes 6 to 12 months, depending on the severity of the ACL injury, whether you have undergone surgery, your age, and your activity level. For patients who have ACL reconstruction, it is important to understand that surgery alone is not enough, consistent, well-guided physiotherapy is crucial. Poor compliance with rehabilitation greatly increases the risk of a stiff knee, reduced range of motion, ongoing pain, and difficulty returning to sport or daily activities.
ACL rehabilitation is usually divided into phases, each with specific goals and treatments:
Throughout your recovery, our physiotherapist will combine these treatments as needed, adjusting intensity, monitoring your progress, and guiding each stage of rehabilitation. By following your program closely and working together with our physiotherapist, you can optimise your recovery and work towards a safe, confident return to your usual activities and sport.
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