ACL Surgery & Reconstruction in Atlanta.
What can happen when an ACL tear is left untreated
An ACL doesn't heal back together; the trouble comes from the instability rather than the tear itself. The ligament keeps your tibia from sliding forward under your femur and prevents excessive rotation when you turn. Without the ligament, the knee moves around while under load, and all of the movement takes its toll on other structures not designed to provide stability. This is what leads to secondary injuries.
Each episode of instability chips at the menisci, the cartilage discs between the two bones, and at the articular cartilage, the smooth layer covering the bone ends. An unstable knee carried for years has a greater chance of ending in arthritis. That is what we see long after an ACL injury: not the torn ligament, but the damage the instability left in the meniscus and cartilage.
That is why the knee stiffens, swells, and aches, and why stairs start to feel like something to avoid. Protecting those structures is the point of treating an ACL tear, and it is joint preservation in its plainest form.
What an untreated tear takes is rarely the ligament itself. It is the meniscus and the cartilage that give ground over time, and that quiet loss is where so much long-term knee pain begins.
ACL Tears Video Library
Condition overviews, treatment options, surgical animations, surgical videos and explainers for ACL tears, from the OrthoPedia patient education library.
ACL Tears
15 videosCan an ACL tear be treated without surgery?
It depends on who is asking.
A completely torn ACL will not knit back together. What non-operative care does instead is teach the rest of the knee to cover for it. That approach works best for older and less active people, who do not play cutting and pivoting sports, and who are prepared to change what they ask of the knee. It also works for certain partial tears that remain stable once strength has returned. And it's the least appropriate for young athletes, for people playing cutting sports, or whose occupations rely on them trusting their knees on uneven surfaces.
Care starts immediately: protect the knee, bring the swelling down with ice and elevation, see a doctor, and begin moving it when you are cleared to. From there, it's a question of strength and stability: quadriceps and hamstring strengthening, hip strengthening, and balance and coordination exercises to build back proprioception (the joint's awareness of where it is in space). A brace gives further positional stability.
None of these things repair the ligament, though. Muscles can compensate for a missing ACL to a degree, but that degree falls below the expectations of most active people. If your knee continues to buckle despite months of rehab, you've reached the limit of what compensatory mechanisms can do. The alternatives are then either a conservative management plan with a brace or surgery. If the tear sits near the top of the ligament and is recent, repair might even be an option. A meniscus tear alongside the ACL changes the calculation again, since a cushion that can be fixed is worth fixing while the knee is already being operated on. If you do not know what fits your knee, request an appointment and have the tear graded.
The BEAR implant compared with traditional reconstruction
Most ACL operations are one of two procedures, and the difference is what your knee keeps. Reconstruction replaces the ligament. Repair keeps it.
The evidence that matters is the kind that reports final outcomes. A randomized trial of young, active patients, and a longer follow-up of the same group, compared repair with reconstruction and found similar patient-reported scores and measured stability among those evaluated.
Both groups were relatively small and the follow-up was not long enough to know which approach would last a lifetime, and reconstruction's longer track record is why it remains the more common choice here. Since the scaffold functions by trapping the patient's own blood at the site of injury, it is considered a type of regenerative medicine, although it involves surgery.
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ACL reconstruction.
The damaged ligament is removed and replaced by a tendon graft. This usually involves taking a piece of tendon tissue from the patient themselves (patellar tendon, hamstring tendons or quadriceps tendon), but donor tissue may be used if appropriate. The graft is placed between two tunnels drilled through the femur and tibia and held in place as the ligament used to be.
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Bridge-enhanced ACL repair, or BEAR.
The torn ligament stays in place. A collagen scaffold is set into the gap between the torn ends and soaked in your own blood, and the clot that forms carries the material the ligament can grow across as the scaffold dissolves. It is still a surgery, not an injection.
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What the implant is made of.
The scaffold is collagen from cows, so we check an allergy and sensitivity history against the current device labeling prior to screening anyone for it.
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Why a repair can fail.
The first limit is eligibility, and it is strict: the repair needs the right tear location, enough healthy tissue on the bone side, the right timing after injury, and the right skeletal maturity. Without that tissue, the tear cannot heal back together. Past eligibility, repair carries the same risks as any ACL surgery: re-tear, continued instability, and further operations.
How safe ACL surgery is, and how well it works
Both halves of that question have honest answers, and neither is a number.
ACL reconstruction is a standard operation that is very well studied, performed arthroscopically via small incisions, and is not free of risk. The risks common to all knee surgeries are infection, bleeding, deep vein thrombosis (a blood clot in the leg), damage to nerves or blood vessels, persistent pain, and weakness that takes rehabilitation to improve.
Two specific risks should be mentioned. The graft or the repair can fail, through reinjury or a knee that stays unstable, and a failed one sometimes means another operation. Another specific risk is stiffness. A knee that is not able to achieve full extension after the surgery is a known complication, sometimes because scar tissue forms in the notch where the ligament sits and blocks the last few degrees of extension. This is why getting full extension early is emphasized over further flexion, and why loss of extension that doesn't improve with physical therapy is evaluated rather than left alone.
As for how well it works, success is defined on the knee itself: stable on exam, strength equal to the other side, even performance on hop and functional tests, and confidence when you load it. No success rate is quoted here because no single number would be honest, and none would predict your knee.
Getting back on your feet after ACL surgery
Walking is not the enemy after ACL surgery. The enemy is walking outside the weight-bearing instructions you were given, or so far that the knee is swollen and stiff by the next morning. Recovery runs in stages, and each one is passed on what the knee can handle.
Protection.
Crutches and a brace, as your surgeon instructs. Ice and elevation control swelling, and straightening the knee completely matters most in the first days. The quadriceps needs waking early; a quad that has switched off is harder to bring back.
Weight and motion.
Weight on the leg increases on your surgeon's schedule, and crutches go away when the leg can carry you without them. Bending progresses too, but full straightness comes before the last degrees of bend.
Strengthening.
The quadriceps, hamstrings, hips and core all contribute to this phase, which often involves balance and coordination work to restore proprioception. This phase can take the longest.
Running and sport-specific work.
Straight-line running precedes cutting; cutting and pivoting drills precede anything with an opponent in it, and each phase awaits testing, not the calendar.
Return to demand.
Clearance lives on the knee: stability on exam, strength equal to the opposite leg, symmetric hop tests, and feeling like you trust it to do its job when you need it most.
So yes, you can walk too much after ACL surgery, and swelling or overnight stiffness is the cue that you did. The graft is also at its weakest midway through recovery, while it is turning back into ligament tissue, which is why the program does not speed up just because the knee feels fine. The mechanics of the operation itself, and how this recovery compares with other procedures, live on the knee surgery page.
How Atlanta Sports Medicine Institute handles an ACL injury
Before you fix a knee ligament you need to understand what happened. The history tells us most of it: how the knee twisted, whether it popped, how fast it swelled, and what you were doing at the time all point toward or away from a torn ligament.
After that, the examination is the next best way to evaluate your knee. Your physician will check for signs of instability by putting stress on the damaged ligament.
Imaging comes next. X-rays show whether any bone broke, and an MRI shows which ligament is torn and what else came with it. This is important because damage to the meniscus, cartilage or other ligaments may change the treatment plan.
Timing matters too: waiting too long can close off options, especially the ones that save your own ligament. We prefer to keep your own ligament when the tear pattern allows it, and to repair the meniscus when it can be repaired. That is the joint preservation thread that runs through the practice, and regenerative medicine sits in the same conversation when the tissue is irritated rather than torn.
Two of the credentials on record sit closest to this work. Served as an orthopedic surgeon and team physician for the Miami Heat, Atlanta Thrashers, and Atlanta Falcons from 2007 to 2011. Fellow of the American Academy of Orthopaedic Surgeons (FAAOS). Atlanta patients come in at every point on that line, from the week they heard the pop to years into living with a knee that buckles. Wherever you are on it, request an appointment and start with the current state of the joint.
Is it bad to walk too much after ACL surgery?
Walking itself is not what damages a healing ACL graft, but walking too much too soon, or on the wrong surface, or without following your weight-bearing instructions, can slow your recovery and irritate the knee. In the first days after surgery, most patients walk short distances with crutches and a brace, increasing distance gradually as swelling and strength allow. The graft needs time to heal into bone, and the surrounding soft tissue needs time to calm down before it can handle repetitive load.
The signs that you have walked too much are usually easy to spot: increased swelling, new or worsening pain, a knee that feels warm or stiff the next morning, or a limp that reappears after you thought it had resolved. If any of these show up, that is the knee telling you to scale back, elevate, ice, and let the swelling settle before adding more steps. Pushing through those signals does not speed healing. It tends to set it back by keeping the joint inflamed when it should be quieting down.
On the other end, too little walking is also a problem. Prolonged inactivity can lead to stiffness, muscle loss around the knee, and a harder time regaining a normal gait pattern later. The goal is steady, guided progression rather than either extreme, with activity increased in response to how the knee actually responds, not a fixed daily step count.
Because every graft type and every patient's starting condition is different, walking tolerance after ACL surgery is one of the most individualized parts of recovery. If you are unsure whether your activity level is appropriate for your stage of healing, it is worth a conversation with your surgical team, especially if you are also managing a separate meniscus tear or other knee pain alongside the ACL repair.
Start with clarity about your knee.
If pain is limiting the way you train, work, sleep, or move, an evaluation can turn uncertainty into a practical next-step plan.
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A focused conversation
Explain what you want to return to, not only what hurts.
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A whole-knee assessment
Look for the combination of findings that best explains the symptoms.
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A clear next-step plan
Understand the likely cause, whether imaging helps, and what comes next.
Care built around diagnosis, clarity, and durable function.
Atlanta Sports Medicine Institute helps active patients understand what may be driving their symptoms and compare appropriate treatment paths. The experience should be precise, understandable, and tied to the activities each patient wants to return to.
How common is ACL surgery?
An ACL tear is one of the most familiar serious knee injuries in athletes who cut, jump, land, and pivot, and reconstruction is standard work for a sports medicine surgeon. Routine for the surgeon does not make it routine for you. Whether you need the operation depends on the tear, on any other structures injured with it, and on how much stress your knee has to carry.
Do you ever fully recover from ACL surgery?
The measure of your success will not be whether the knee feels like the knee you had before, but what it allows you to do. A successful outcome is defined as a stable knee, equal strength compared to the unoperated leg, and a return to desired activities. Some knees end up feeling normal; others stay noticeable to their owners. Both happen, and no one can tell you in advance which you will get.
How long after ACL surgery can you walk normally?
The return of walking is a process, not a day. Gradually increasing weight bearing follows your surgeon's advice; crutches are dropped when you can control your knee with the leg alone; and limping disappears when your knee is fully extended and the quadriceps contracts strongly. Swelling is usually the limiting factor. Your surgeon and therapist guide your schedule based on what your knee does. Progressing too soon often results in setbacks.
Can I walk on a torn ACL?
Some patients can walk after tearing an ACL, especially if swelling is limited and other structures in the knee are not injured. The knee often feels unstable or gives way, particularly on turns, pivots, or uneven ground, because the ACL helps keep the shinbone from sliding forward under the thighbone. Walking on flat, straight surfaces may feel manageable while the knee still buckles during faster or rotational movements.
Continuing to walk or bear weight on an unstable knee can also increase the risk of further injury to the meniscus or cartilage, so it is worth having the knee evaluated before returning to normal activity.
Is ACL surgery very painful?
Discomfort after ACL surgery is expected, and your surgical team will work with you on a plan to manage it during your recovery. Pain is usually most noticeable in the first days after surgery and tends to ease as swelling goes down and physical therapy progresses. Everyone experiences and manages pain differently, so it helps to talk with your surgeon ahead of time about what to expect and how it will be addressed during your specific recovery.
Is ACL surgery dangerous?
ACL surgery is a common orthopedic procedure, and like any surgery it carries some risk, but serious complications are uncommon. Your surgeon will review your individual health history and discuss the specific risks and benefits of the procedure with you before you consent to surgery. Following your surgeon's guidance on activity, bracing, and rehab after surgery is the best way to support a safe recovery.
What is the newest treatment for a torn ACL?
Surgical technique and graft choice for ACL reconstruction continue to change, and researchers keep studying different grafts, fixation methods, and rehabilitation approaches to find what works best for different patients. Rather than one single new treatment, the field has moved toward matching the approach to the individual, considering age, activity level, and the specific pattern of the tear. If you want to know what options fit your case, the right step is an evaluation with an orthopedic surgeon who can review your imaging and history and discuss which approach is appropriate for you.
Can you recover 100% from ACL surgery?
Many patients regain strength, stability, and confidence in the knee after ACL surgery and return to daily activities and sport-related movement, but recovery is gradual and depends on the extent of the original injury, any other structures involved (such as meniscus or cartilage), and how closely rehabilitation guidance is followed. Some patients notice lingering differences in how the knee feels compared to before the injury, even after the graft has healed and formal rehab is complete. Your surgeon can talk through what to reasonably expect based on your specific injury, activity goals, and progress during recovery.
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