An ACL tear can be a significant setback, especially for athletes and active individuals. The ACL (anterior cruciate ligament), located in the knee, plays a crucial role in stabilizing and allowing movement. When it’s torn, physiotherapy becomes essential for a successful recovery. In this guide, we’ll explore the causes of ACL tears, prevention strategies, and the various physiotherapy techniques that can aid in recovery.

Causes of ACL Tears
What It Is: The ACL is a ligament in the knee that helps stabilize the joint and control movement. An ACL tear is a common knee injury, particularly in sports.
Common Causes:
- Sudden Stops and Starts: Rapid changes in direction or sudden stops can put excessive stress on the ACL.
- Direct Impact: A blow to the knee or a collision, common in contact sports like football or basketball, can cause the ACL to tear.
- Improper Landing: Landing awkwardly from a jump or fall can also strain the ACL.
Prevention Strategies
How to Reduce Risk: While not all ACL tears can be prevented, taking certain measures can significantly lower your risk.
- Strength Training: Strengthen the muscles around your knee, including the quadriceps, hamstrings, and calf muscles, to provide better support and stability.
- Proper Technique: Learn and practice proper techniques for jumping, landing, and pivoting to reduce stress on your knee.
- Warm-Up: Always warm up before engaging in sports or strenuous activities to prepare your muscles and joints for the demands ahead.
Resistance Exercises
Purpose: Resistance exercises help build strength in the muscles surrounding the knee, which is crucial for stabilizing the joint and aiding recovery. The ones mentioned below are to be performed in the latter stages of rehab, with professional help.
Examples:
- Squats: Perform squats with proper form to strengthen the quadriceps, hamstrings, and glutes.
- Leg Press: Use a leg press machine to work on lower body strength while controlling the range of motion.
- Lunges: Lunges help in building strength and balance in the legs, targeting various muscle groups around the knee.
How to Do Them Safely: Start with light weights or bodyweight, gradually increasing the resistance as your strength improves. Focus on maintaining proper form to avoid additional strain.

Neuromuscular Exercises
Purpose: Neuromuscular exercises enhance the communication between your brain and muscles, improving coordination and balance.
Examples:
- Balance Boards: Standing on a balance board helps improve stability and proprioception (awareness of your body’s position in space).
- Single-Leg Stands: Practice standing on one leg to strengthen stabilizing muscles and improve balance.
- Agility Drills: Incorporate ladder drills or cone drills to enhance agility and neuromuscular control.
How to Do Them Safely: Start with easier exercises and gradually progress to more challenging ones as your balance and coordination improve.

Progressive Exercises
Purpose: Progressive exercises are designed to gradually increase in difficulty, helping to build strength and endurance while avoiding overexertion.
Examples:
- Step-Ups: Begin with low steps and gradually increase the height as your strength and stability improve.
- Resistance Bands: Use resistance bands to add progressive resistance to leg exercises, adjusting the band’s tension as needed.
- Cycling: Start with short, low-resistance cycles and progressively increase duration and resistance.
How to Do Them Safely: Follow a structured program that gradually increases the intensity and complexity of exercises to prevent overuse injuries.
Stretching and Strengthening
Purpose: Stretching maintains flexibility and prevents stiffness, while strengthening exercises build the muscle support necessary for knee stability.
Examples:
- Hamstring Stretch: Gentle stretching of the hamstrings can help maintain flexibility and reduce tension in the knee.
- Quadriceps Stretch: Stretch the quadriceps to keep the front of the thigh flexible and balanced.
- Strengthening Exercises: Incorporate exercises like leg lifts and bridges to build muscle strength around the knee.
How to Do Them Safely: Perform stretching exercises slowly and hold each stretch for 20-30 seconds. Strengthening exercises should be done with controlled movements and proper form.
Mobility Routine
Purpose: A mobility routine focuses on improving the range of motion and function of the knee joint.
Examples:
- Knee Circles: Perform gentle knee circles to increase flexibility and mobility.
- Heel Slides: Lie on your back and slide your heel towards your buttocks to improve knee flexion.
- Straight Leg Raises: Lift your leg while keeping it straight to maintain and improve knee range of motion.
How to Do Them Safely: Ensure you’re performing exercises within a comfortable range of motion and avoid pushing through pain.
Tips for Safely Performing Activities
How to Stay Safe: As you recover and resume activities, following these tips can help prevent re-injury and ensure a safe return to your routine.
- Listen to Your Body: Pay attention to any pain or discomfort and modify your activities as needed.
- Gradual Return: Ease back into your regular activities and sports gradually to allow your knee to adjust.
- Use Supportive Gear: Consider using a knee brace or support during high-impact activities for added stability.
- Seek Professional Guidance: Work with a physiotherapist to develop a personalized rehabilitation program and get advice on technique and progression.
Physiotherapy Treatment of an ACL Sprain
A physiotherapist will examine both knees, comparing the injured knee to the uninjured one. During this exam, the physiotherapist will check your injured knee for signs of swelling, deformity, tenderness, fluid inside the knee joint, and discoloration. If the patient does not have too much pain and swelling, a physiotherapist will then evaluate the knee’s range of motion and will pull against the ligaments to check their strength. During the exam, the patient will have to bend their knee and the physiotherapist will gently pull forward or push backward on their lower leg where it meets the knee.
Based on the results of the patient’s exam, diagnostic tests may need to be performed to further evaluate the condition of the patient’s knee. These tests may include standard X-rays to check for ligament separation from bone or fracture. Tests may also include an MRI scan or a camera–guided knee surgery (arthroscopy). The expected duration of recovery depends on the severity of the patient’s knee sprain, their rehabilitation program, and what type of sports the patients play. In general, milder sprains heal within 2-4 weeks, whereas other types may take 4-12 months.
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