Achilles tendon injuries can affect a broad range of people, from experienced athletes to those new to sports. The Achilles tendon is the largest and strongest tendon in the body, connecting the calf muscles to the heel bone and playing a key role in walking, running, and jumping.
These injuries generally fall into two main categories: tendinitis, which is inflammation of the tendon, and ruptures, which involve partial or complete tearing of the tendon.
“A ruptured Achilles tendon is often dramatic and unmistakable,” said Dr. Michael Cotton, orthopedic surgeon at Houston Methodist.
While both conditions require medical attention, a rupture is considered urgent. Early evaluation can influence treatment options and long-term recovery. Recognizing the symptoms of each injury helps ensure prompt care.
A rupture typically occurs during a forceful movement when pushing off the foot. Common signs include an audible pop or snap at the back of the ankle, swelling and pain in that area, difficulty pushing off or rising onto toes, and a sensation similar to being kicked or punched in the leg.
“Patients mention this last sensation in particular all the time,” Dr. Cotton said. “They turn around and expect someone to be there, and there’s nobody within 10 yards of them. That being said, they’re often able to walk afterwards.”
Tendinitis develops gradually due to overuse. Initial symptoms may include pain or stiffness with morning steps, swelling or tenderness at the heel’s back, and improvement as activity continues.
Anyone can suffer from Achilles injuries; however, active adults—especially those involved in basketball, soccer, tennis or pickleball—are at higher risk. Other risk factors include tight calf muscles, previous tendinitis episodes that weaken the tendon over time, and sporadic participation in intense physical activity without regular training.
“Many patients with ruptures have had intermittent tendinitis for years — tightness, soreness or recurring flare‑ups that temporarily improved with stretching,” Dr. Cotton noted.
Diagnosis usually relies on a physical exam focusing on an area 2-6 centimeters above the heel where blood flow is limited—a common site for ruptures. “Oftentimes with a complete rupture, I’m able to actually feel the defect,” Dr. Cotton explained. “I can run my finger along the back of the ankle and can feel the little defect or a divot on the tendon.”
Other tests include resting tension assessments (noting toe position while lying down), Thompson test (squeezing calf muscle to observe foot movement), and MRI imaging if necessary.
Treatment for Achilles ruptures depends on how soon after injury patients are evaluated as well as their activity level and preferences. According to Dr. Cotton: “A clear benefit to early care is that it may be possible for the ends of the tendon to be positioned closely enough to heal without surgery… Outside of that time frame, closing the tendon without surgery is difficult.” Non-surgical treatment includes immobilization with a boot for up to 12 weeks followed by structured rehabilitation; surgery may be advised for highly active individuals or when non-surgical healing isn’t possible.
For tendinitis cases not responding after six months of conservative measures like stretching exercises, physical therapy, anti-inflammatory medication or short-term immobilization—a surgical approach might be considered involving removal of damaged tissue or lengthening calf muscles.
Both operative and non-operative treatments carry some risk of re-injury; however non-operative methods have slightly higher re-rupture rates while surgery may help preserve push-off strength for more active individuals.
“If you feel a pop, call your doctor’s office and let them know so you can get in as soon as possible,” Dr. Cotton advised. “If you also hear a popping sound or have sharp pain in the back of your ankle, don’t wait. Early evaluation can expand your treatment options and improve your long‑term outcomes.”
Listening to one’s body remains important whether preparing for recreational sports leagues or recovering from marathon activities.
