Gold Member Badge


  • You're all caught up!

Knee Pain After ACL Reconstruction

author image Jennifer Williams
Jennifer Williams has been writing as a freelancer for local newspapers since 1999. Her work now appears on various websites. She did a five-year orthopaedic surgery residency, followed by a one-year sports medicine fellowship and has been a team physician for NCAA Division I universities and high school teams. As a former collegiate athlete, Williams continues competition at the masters level.
Knee Pain After ACL Reconstruction
An older man is experiencing knee pain. Photo Credit: nandyphotos/iStock/Getty Images

Pain is common immediately after anterior cruciate ligament, or ACL, reconstruction surgery. With time and active rehabilitation, this pain should decrease and eventually disappear. There are several causes of pain that starts days to years after surgery.

Video of the Day

ACL Surgery

Arthroscopic surgery is done to replace a torn ACL. Using a small camera and shaving instruments, the torn ACL is removed. Holes are drilled into the thigh bone and lower leg. The patella tendon with pieces of your kneecap and lower leg bone attached, hamstring tendons, or a cadaver graft is used to replace the ACL. The graft is held in place with screws. In some procedures the screws are inside the bone, while other techniques use metal hardware outside the bone.


Infection is a serious potential complication of ACL surgery. It presents as increasing pain, swelling and redness. There may be drainage from the surgical incisions. The treatment of an ACL surgery infection includes repeat arthroscopic surgeries to clean out infected areas, and up to six weeks of intravenous antibiotics. Removal of the graft may be required to treat the infection. Infection is rare -- the American Academy of Orthopaedic Surgeons reports that this occurs after less than 1 percent of ACL surgeries. Infection is most common in the first 90 days after surgery.

Early Pain

In the first month after surgery, blood clots can develop in the leg. This causes painful swelling in the lower leg. Blood clots are more common in people with a family history of blood clotting disorders. Clots that travel to your lungs can be fatal. Seek immediate medical attention if you suspect you may have a clot. Early after surgery, you may also experience pain at the surgical scar sites.

New Injury

New injuries can occur as you become more active after ACL surgery. However, according to the American Academy of Orthopaedic Surgeons, this risk of injury is equal for both knees. If you experience a sudden, new pain while recovering from ACL surgery, see your surgeon.

Late Pain

Tearing an ACL requires significant force. In the first years after ACL surgery you may experience pain behind your kneecap. This pain originates from damaged cartilage on the kneecap, or improper movement of your kneecap as you move you leg. Bracing and therapy often relieve patella pain.

LiveStrong Calorie Tracker
Lose Weight. Feel Great! Change your life with MyPlate by LIVESTRONG.COM
  • Gain 2 pounds per week
  • Gain 1.5 pounds per week
  • Gain 1 pound per week
  • Gain 0.5 pound per week
  • Maintain my current weight
  • Lose 0.5 pound per week
  • Lose 1 pound per week
  • Lose 1.5 pounds per week
  • Lose 2 pounds per week
  • Female
  • Male
ft. in.



  • American Academy of Orthopaedic Surgeons: Your Orthopaedic Connection: ACL Injury: Does It Require Surgery
  • "American Academy of Orthopaedic Surgeons, Orthopaedic Knowledge Update 9"; J. Fischgrund, ed; 2009
  • "American Academy of Orthopaedic Surgeons, Comprehensive Orthopaedic Review"; J. Lieberman, ed.; 2009
  • “The Journal of Bone and Joint Surgery”; Epidemiology of Anterior Cruciate Ligament Reconstruction. Trends, Readmissions, and Subsequent Knee Surgery; Stephen Lyman, Panagiotis Koulouvaris, Seth Sherman, Huong Do, Lisa A. Mandl, and Robert G. Marx; 2009
Demand Media