Introduction
Anterior Cruciate Ligament (ACL) reconstruction is a surgical procedure to replace a torn ACL, one of the major ligaments in the knee that provides stability. ACL tears are common sports injuries, frequently occurring during activities that involve sudden stops, jumping, or changes in direction, such as soccer, basketball, football, and skiing. When the ACL is torn, the knee can become unstable, giving way during physical activity. While some individuals with low activity levels can manage an ACL tear with physical therapy and bracing, active individuals and athletes usually require surgery to restore knee stability, return to sports, and prevent further damage to the knee’s cartilage (meniscus). The surgery involves replacing the torn ligament with a tissue graft, as the ACL cannot simply be stitched back together.

Surgical Procedure
ACL reconstruction is typically performed arthroscopically under general anesthesia or regional anesthesia (spinal block).
The surgeon makes several small incisions around the knee to insert the arthroscope (a small camera) and surgical instruments. First, the surgeon removes the remnants of the torn ACL. Next, a replacement graft is prepared. This graft can be an autograft (tissue taken from the patient’s own body, commonly the patellar tendon, hamstring tendon, or quadriceps tendon) or an allograft (tissue from a deceased donor).
The surgeon drills bone tunnels into the femur (thighbone) and tibia (shinbone) to precisely position the graft in the same anatomical location as the original ACL. The graft is pulled through these tunnels and secured tightly to the bone using screws, buttons, or other fixation devices. Over time, the bone will heal around the graft, integrating it into the knee. The surgeon checks the knee’s stability and range of motion before closing the small incisions and applying a sterile dressing and a knee brace.

Surgical Risks
As with any surgery, ACL reconstruction carries risks such as adverse reactions to anesthesia, infection, bleeding, and the formation of blood clots in the legs (deep vein thrombosis).

General Complications
Common complications during the recovery phase include:
– Significant knee pain and swelling, managed with pain medication, ice, and elevation.
– Knee stiffness and loss of motion, particularly a lack of full extension (straightening). Rigorous physical therapy is required to overcome this.
– Numbness around the incision sites, which is common and often permanent but usually does not affect knee function.
– Weakness in the thigh or hamstring muscles, depending on where the graft was harvested.

Rare but Serious Complications
More severe complications can include:
– Graft failure: The new ligament can stretch out or tear again, either due to poor healing or a new injury.
– Infection inside the knee joint, requiring urgent surgical washout and antibiotics.
– Arthrofibrosis: The formation of excessive scar tissue inside the joint, severely restricting movement and sometimes requiring further surgery to remove.
– Damage to surrounding nerves or blood vessels during the procedure.

Pre-operative Preparation
– “Pre-hab”: Physical therapy before surgery is often recommended to reduce swelling, restore full range of motion, and strengthen the muscles around the knee. Operating on a stiff, swollen knee increases the risk of post-operative complications.
– Medical Clearance: Routine blood tests and a physical exam.
– Fasting: No eating or drinking for 8 to 12 hours before surgery.
– Home Preparation: Arrange for someone to drive you home and assist you for the first few days. Set up a comfortable recovery area with ice packs and pillows for elevation.

Post-operative Care
ACL reconstruction is usually an outpatient procedure. You will go home with your knee in a brace and will use crutches to limit weight-bearing. Pain management is crucial; you may receive a nerve block during surgery that provides pain relief for the first 12 to 24 hours. Physical therapy begins within a few days of surgery and is the most critical component of a successful recovery. The initial focus is on reducing swelling, regaining full knee extension, and activating the quadriceps muscles.

Wound Care
– Keep the incisions clean and dry. Follow your surgeon’s specific instructions on when it is safe to shower (usually after a few days if covered).
– Do not soak the knee in a bath or pool.
– Monitor for signs of infection: increasing redness, warmth, excessive swelling, or pus.

Diet
Maintain a healthy, balanced diet. Protein and vitamin C are important for tissue healing. Stay hydrated to help flush out anesthesia medications and prevent constipation from painkillers.

Post-discharge Notes
Full recovery and return to sports after an ACL reconstruction is a long process, typically taking 9 to 12 months.
– Adhere strictly to your physical therapy protocol. Do not rush the process, as the graft needs time to heal and strengthen.
– You will gradually progress from walking with crutches to walking independently, then to light jogging, agility drills, and finally sport-specific training.
– Wear your knee brace as directed by your surgeon.
– Contact your doctor if you have a fever, severe calf pain (a sign of a blood clot), sudden severe knee pain, or if the knee feels unstable.