A torn Achilles tendon can be treated with surgery or without it, and for most people, both approaches lead to similar functional outcomes. The choice depends on your activity level, your risk of re-rupture, and how quickly you need to get back to full capacity. Either way, recovery is measured in months, not weeks, and some degree of calf strength loss is likely to persist for years.
How a Torn Achilles Is Diagnosed
Most Achilles ruptures happen suddenly during a push-off movement, like sprinting, jumping, or pivoting. You may feel a sharp snap at the back of your ankle, followed by difficulty walking or pointing your foot downward. A doctor can usually confirm the tear with a physical exam, without imaging.
The most reliable bedside test is the Thompson test: you lie face down while the doctor squeezes your calf muscle. If the Achilles is intact, your foot will point downward. If it’s torn, the foot barely moves. This test is 96% sensitive and 93% specific. A second test, the Matles test, involves bending your knee to 90 degrees while lying face down. A torn tendon lets the foot drop to a neutral position instead of angling downward, and this test is 88% sensitive. The doctor will also feel along the tendon for a gap. When all three tests are positive, sensitivity reaches 100%. An MRI or ultrasound is sometimes used to confirm partial tears or plan surgery, but the physical exam alone is often enough.
Surgery vs. Non-Surgical Treatment
This is the biggest decision you’ll face, and the answer is more nuanced than it might seem. A large meta-analysis of randomized controlled trials found that surgery drops the re-rupture rate from about 9.6% to 3.2%. That’s a meaningful difference if you’re an athlete or someone whose livelihood depends on lower-body power. But in terms of overall function, returning to sports, range of motion, and ability to do a single-leg heel raise, the two approaches showed no significant difference.
Surgery did produce better results in two specific areas: less calf muscle wasting and shorter time off work. For people at higher risk of re-rupture (younger, very active individuals, or those with a large gap between the torn tendon ends), surgery is generally the stronger option. For others, a well-structured non-surgical rehab program can produce equivalent long-term results while avoiding surgical risks like infection and nerve damage.
What Non-Surgical Treatment Looks Like
If you and your doctor opt against surgery, the first step is immobilization. Your ankle is placed in a cast with the foot pointed fully downward (called maximum plantarflexion). This position brings the torn tendon ends as close together as possible so scar tissue can bridge the gap. You’ll stay non-weight-bearing on crutches for the first two weeks.
After that initial period, the ankle is gradually brought to a more neutral position over several weeks, typically in a removable walking boot with heel wedges. You’ll progress from partial weight-bearing to full weight-bearing in the boot by around four to six weeks. The boot is usually worn for a total of eight to twelve weeks before transitioning to a supportive athletic shoe. The key to non-surgical success is following the rehab protocol closely. Skipping steps or rushing back to activity is what drives re-rupture rates higher.
What Happens During Surgery
Surgical repair involves stitching the two ends of the torn tendon back together. There are two main approaches: open surgery, where a larger incision gives the surgeon direct access, and minimally invasive surgery, which uses smaller incisions and specialized instruments.
Minimally invasive repair has gained ground in recent years. An umbrella review of multiple meta-analyses found it offers lower rates of wound complications, fewer infections, less tissue adhesion, and shorter operating times (roughly 30 minutes versus 50 minutes for open repair). Recovery times were also faster. The trade-off is a slightly higher risk of sural nerve injury, a nerve that runs along the outside of the foot. This can cause numbness or tingling along the outer edge of the foot, though it often resolves over time. Re-rupture rates are comparable between the two surgical methods.
The Rehabilitation Timeline
Whether you have surgery or not, the rehab arc follows a similar pattern, though the specific timing varies by protocol and individual healing.
For the first two weeks after surgery, you’re typically non-weight-bearing in a boot or cast. Accelerated protocols may allow partial weight-bearing almost immediately, but this depends on the surgeon’s preference and the quality of the repair. By four to six weeks, most people progress to full weight-bearing in a boot with heel wedges that are gradually reduced.
Between six and twelve weeks, you transition out of the boot and into a regular shoe. Walking feels more normal, but the tendon is still healing and the calf is significantly weakened. This is when structured physical therapy becomes critical.
Running typically begins no earlier than 12 to 16 weeks post-surgery, and only after hitting specific strength benchmarks. Your physical therapist will want to see you perform at least 10 single-leg heel raises through full range of motion, demonstrate strong single-leg squat control, and produce adequate calf strength on testing before clearing you to jog.
Full return to sport happens at six months or later. The criteria are demanding: calf strength within 90% of the uninjured leg, symmetrical jumping ability with less than 10% difference between legs, and adequate reactive strength on drop-jump testing. Many athletes don’t meet these benchmarks until nine to twelve months out.
Exercise Progression During Rehab
Rehab follows a deliberate loading progression that moves from gentle to demanding. In the early weeks after you’re out of the boot, you start with two-legged heel raises on flat ground, sitting heel raises, and gentle ankle pumping to improve circulation. Single-leg heel raises on flat ground are introduced once you can handle double-leg work comfortably.
The next phase adds range of motion by moving heel raises to the edge of a stair, where your heel drops below the step. This is where eccentric loading begins. Eccentric exercises, where you slowly lower your heel below the step under control, are a cornerstone of Achilles rehab. They stimulate tendon remodeling and build the type of strength the tendon needs for real-world forces. Sets of 15 repetitions, performed with both a straight knee and a bent knee (to target different calf muscles), done twice daily, is a standard prescription.
As tolerance builds, you add external weight. A loaded backpack or a weight machine lets you progressively increase the eccentric challenge. From there, the program transitions to faster, more explosive movements: quick-rebounding heel raises, hopping drills, and eventually sport-specific agility work.
Long-Term Strength and Muscle Changes
Even with excellent treatment and diligent rehab, a torn Achilles leaves a lasting mark on calf strength and muscle size. Research consistently shows calf strength deficits of 10 to 30% compared to the uninjured leg, and these deficits persist for years. One study found a 47% strength deficit at 2.5 years. Others found 10 to 20% deficits still present at 6 years, and 12 to 18% deficits at 14 years.
The calf muscle itself shrinks. Studies using MRI have documented reductions in muscle thickness of 9 to 24%, with the soleus (the deeper calf muscle) losing the most volume. The healed tendon also ends up longer than the original, by an average of about 12 millimeters. A longer tendon means the calf muscle operates at a mechanical disadvantage, which partly explains the persistent weakness.
This doesn’t mean you can’t return to high-level activity. Many professional athletes have come back from Achilles ruptures. But it does mean that long-term calf strengthening should remain part of your routine indefinitely, not just during formal rehab. The strength gap narrows most in the first two to three years and then plateaus, so continued training during that window matters most.
PRP Injections: Do They Help?
Platelet-rich plasma injections have been marketed as a way to speed tendon healing, but the evidence doesn’t support this for Achilles ruptures. The PATH-2 trial, a rigorous double-blind, placebo-controlled study, found no difference in muscle-tendon function or patient-reported recovery at 24 weeks between PRP and placebo injections. The results were clear enough that the researchers specifically cautioned against the growing global use of PRP for acute tendon injuries without better evidence.