Achilles tendon rupture

The Achilles is the thick tendon connecting the calf muscles to the heel bone, and it transmits the force that lets you push off, sprint and jump. A rupture is a complete tear, usually a few centimetres above the heel in an area with a relatively poor blood supply.

Most patients describe feeling as though they were struck or kicked in the back of the ankle. It is common to be able to limp afterward, because other muscles can weakly point the foot — which is exactly why this injury is sometimes missed at an initial urgent-care visit and mistaken for a sprain.

The presentation is usually acute and distinctive.

The typical scenario is an abrupt acceleration or jump in a recreational athlete between 30 and 50 — basketball, tennis, soccer, pickleball — often after a period of reduced activity. The tendon fails under a rapid eccentric load as the body moves forward over a planted foot.

Risk is higher with pre-existing Achilles tendinopathy, previous corticosteroid injection around the tendon, fluoroquinolone antibiotic use, and abrupt increases in training. Some ruptures occur with a lower-energy misstep, particularly in a tendon that has been quietly degenerating.

General guidance rather than individual medical advice: sudden pain at the back of the ankle with an audible pop, inability to push off, or a felt gap in the tendon should be evaluated within days, not weeks.

Delayed diagnosis meaningfully narrows the options. Once the torn ends retract and scar in a lengthened position, both bracing and repair become more complicated, and a reconstruction may be required to restore appropriate tendon length. An urgent-care diagnosis of 'ankle sprain' that does not fit the story is worth a second look.

Diagnosis is clinical in most cases. Examination identifies the gap in the tendon, tests the resting position of the foot compared with the other side, and uses the calf squeeze test, in which compressing the calf fails to point the foot when the tendon is torn.

X-rays are obtained to exclude a bony avulsion at the heel. Ultrasound or MRI is used when the diagnosis is uncertain, when the injury is not fresh, or when the amount of separation between the tendon ends will influence the treatment recommendation.

Functional non-operative treatment is a genuine, evidence-supported option — not a consolation prize. The foot is placed in a boot with the ankle in a pointed position and heel wedges that bring the torn ends together, then progressively brought toward neutral over several weeks while weight-bearing is introduced early under supervision.

Contemporary comparative studies show functional rehabilitation achieves function and return-to-activity outcomes similar to surgery in many patients, with a modestly higher rate of re-rupture and no risk of surgical wound complications. That trade-off — wound and nerve risk versus re-rupture risk — is the heart of the decision.

This route is especially attractive for patients with diabetes, vascular disease, tobacco use or other factors that raise wound-healing risk. It requires strict adherence to the protocol, and that expectation is set clearly at the outset.

Repair is more often recommended for higher-demand athletes, for patients presenting later when the tendon ends have separated significantly, for ruptures at the bony insertion, and for re-ruptures.

Its principal advantage in the literature is a lower re-rupture rate; its principal costs are wound-healing and nerve-irritation risks, which are lower with minimally invasive techniques but not zero. Neither path can guarantee a return to a previous level of sport, and that is stated directly.

The goal of surgery is to restore the correct length and tension of the tendon so the calf can generate force again.

Whichever path is chosen, the rehabilitation arc is similar. The ankle is protected in a boot with heel wedges and progressed toward neutral over the first six to eight weeks, with early protected weight-bearing in most modern protocols.

Out of the boot, therapy focuses on restoring calf strength — the deficit that most reliably persists. Walking normally usually returns around the three-month mark, jogging around four to six months, and cutting or jumping sport later, guided by heel-raise endurance and strength testing rather than the calendar.

Blood-clot prevention, swelling control and calf-strength testing are all part of the follow-up plan. These ranges are educational; your protocol is written for your injury and shared with your therapist.

Nolan Horner, MD is a board-certified orthopedic surgeon with sports medicine fellowship training at Rush University Medical Center and experience caring for professional athletes in Chicago. Achilles rupture is a decision-heavy injury, and his approach is to present both treatment paths with their real trade-offs rather than defaulting to one.

Acute injuries are prioritized for prompt evaluation, with clinic days in Oak Brook on Mondays, Little Village on Wednesdays and St. Charles on Thursdays.

This page is general educational information, not individualized medical advice.