Can I walk normally with a torn ACL?

Most people can once the initial swelling settles. The instability tends to show up with twisting, pivoting, or sudden changes of direction rather than straight-line walking.

Will my torn ACL grow back?

A completely torn ACL usually doesn't reconnect on its own, although an MRI follow-up of the KANON trial found signs of healing in some people treated with rehab alone. How well the knee works depends heavily on strength and control, not only on the ligament.

Is it harmful to put off ACL surgery?

Starting with rehab and deciding on surgery later is a reasonable, well-studied approach. The main caution is repeated giving way, which can damage the meniscus and cartilage. If your knee keeps giving way, talk with an orthopedic surgeon.

Can You Treat a Torn ACL Without Surgery?

By Eric M. Rippetoe, PT, DPT, physical therapist and founder of BISHOP · Reviewed September 29, 2026

SHORT ANSWER

Yes, for many people. A completely torn ACL usually doesn't heal back to normal on its own, but many people regain a stable, functional knee with structured rehabilitation, especially if they don't play pivoting sports. In the KANON randomized trial of young, active adults, people who started with rehab and had surgery later only if needed did as well at 2 and 5 years as people who had early reconstruction, and about half of the rehab-first group never had reconstruction. Surgery is usually recommended if the knee keeps giving way despite rehab, if you want to return to cutting and pivoting sports, or if other structures such as the meniscus also need repair.

What the ACL does

The anterior cruciate ligament keeps the shin bone from sliding forward and rotating under the thigh bone. Without it, the knee is most likely to give way during twisting, cutting, and landing. Many people can walk, climb stairs, and do straight-line activities normally once the swelling settles.

What the research shows

The KANON trial randomized 121 active adults aged 18 to 35 with a new ACL tear to either rehab plus early reconstruction or rehab with the option of reconstruction later. At 2 years and again at 5 years, the groups reported similar knee function, pain, and quality of life. About half of the rehab-first group had a delayed reconstruction during those 5 years, and the rest managed without one.

A follow-up MRI study from the same trial found signs of ACL healing in some people treated with rehab alone, and those people tended to report better outcomes. The trial didn't include elite athletes, so results may differ for people returning to high-level pivoting sports.

Who tends to do well without surgery

People who don't play cutting and pivoting sports, or who are willing to change sports.
People whose knee stops giving way during daily activities after the first phase of rehab.
People who recover good quadriceps strength and single-leg control.
People without another injury that needs repair, such as a displaced meniscus tear.
Older or less active adults, and people for whom surgery carries higher risk.

When surgery is usually the better choice

The knee keeps giving way despite a good trial of rehab. Each episode risks further damage to the meniscus and cartilage.
You want to return to soccer, basketball, football, skiing, or other sports with cutting and pivoting.
You also have a repairable meniscus tear or injuries to several ligaments.
The knee locks and won't straighten.

What non-surgical ACL rehab looks like

Rehab usually starts with calming swelling, restoring full straightening, and getting the quadriceps working again. It progresses to strengthening the thigh and hip muscles, balance and single-leg control, and, for active people, agility and sport-specific drills. Expect to work at it for several months, ideally guided by a physical therapist who can test whether your knee is ready for each step.

Do knee braces help an ACL-deficient knee?

Functional ACL braces are designed to limit the forward shift and rotation the ACL normally controls. No brace fully restores normal ligament stability under sports-level forces, but many people with a torn ACL feel more stable and confident wearing one, particularly during the activities that make the knee give way.

A brace only controls the knee if it stays in place. BISHOP braces are modeled from a 3D scan of your leg so they contact the leg evenly and don't slide down. Like any brace, it supports rehab rather than replacing it.

Common questions

Can I walk normally with a torn ACL?: Most people can once the initial swelling settles. The instability tends to show up with twisting, pivoting, or sudden changes of direction rather than straight-line walking.
Will my torn ACL grow back?: A completely torn ACL usually doesn't reconnect on its own, although an MRI follow-up of the KANON trial found signs of healing in some people treated with rehab alone. How well the knee works depends heavily on strength and control, not only on the ligament.
Is it harmful to put off ACL surgery?: Starting with rehab and deciding on surgery later is a reasonable, well-studied approach. The main caution is repeated giving way, which can damage the meniscus and cartilage. If your knee keeps giving way, talk with an orthopedic surgeon.

A brace built from a scan of your leg

BISHOP custom knee braces are designed from a 3D scan of your leg and made in Shreveport, Louisiana. $299.99 per knee, plus shipping. Questions? Call 318-333-1331 ext. 800.

Order a custom brace

Sources

This article is for general education and isn't a substitute for an evaluation by your own clinician.