Orthopedics focuses on the musculoskeletal system. Learn about the diagnosis, treatment, and rehabilitation of bone, joint, ligament, and muscle conditions.
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Tendons are built to be tough, but they are not indestructible. In fact, tendon injuries are among the most common reasons people visit orthopedic surgeons. Understanding why a tendon fails is the first step toward fixing it and preventing it from happening again. Injuries generally fall into two categories: acute trauma, where a sudden force overwhelms the tendon, and chronic overuse, where the tendon is slowly worn down over time until it fails.
There are also biological and lifestyle factors that weaken tendons, making them like old rubber bands that snap unexpectedly. This section explores the “how” and “why” of tendon injuries. We will look at the mechanics of a rupture, the insidious nature of repetitive strain, and the surprising influence of medications and general health on the structural integrity of your connective tissue.
Acute injuries are sudden and often dramatic. Accidents with knives, glass, or machinery frequently cause these injuries in the hand. A deep cut across the palm or wrist can sever the flexor tendons, instantly rendering the fingers unable to bend. These are medical emergencies that require prompt surgical repair to retrieve the retracted tendon ends before they pull too far back into the forearm.
In the larger tendons of the leg, acute injuries often happen during sports. The classic example is the Achilles tendon rupture. This frequently occurs in “weekend warriors”—middle-aged adults playing sports like tennis or basketball. The injury happens during a sudden, explosive movement, like pushing off to sprint or jumping. The force generated by the muscle is simply greater than the tendon’s ability to hold, causing it to snap. Patients often describe a sensation of being kicked in the back of the leg, followed by an inability to walk normally.
While acute injuries receive the most attention, overuse injuries are far more common. This is often referred to as tendinopathy or tendonitis. It occurs when a tendon is subjected to repetitive load without enough time to recover. Every time you use a tendon, it sustains micro-damage. Normally, the body repairs this damage during rest.
However, if the frequency or intensity of the activity is too high, the breakdown outpaces the repair. The collagen fibers become disorganized and weak. Instead of a strong, parallel rope, the tendon tissue starts to look like a messy bowl of spaghetti under a microscope. This degenerated tissue is painful and weak. If the activity continues, this weakened area can eventually tear completely, even with a minor movement. Such degeneration is common in the rotator cuff of the shoulder in painters or the elbow tendons in tennis players.
Age is the single most significant risk factor for tendon injury. As we grow older, the blood supply to our tendons naturally diminishes. The cells that maintain the collagen matrix become less active. The tendons lose their water content and elasticity, becoming stiffer and more brittle.
This natural degeneration explains why a 20-year-old can sprint without warming up, but a 50-year-old might snap an Achilles doing the same thing. The “critical zone” of the rotator cuff in the shoulder is particularly prone to this aging process. By age 60, a significant percentage of people have asymptomatic tears in their rotator cuff simply due to wear and tear over decades.
Surprisingly, certain medications can weaken tendons and increase the risk of rupture. The most well-known culprits are fluoroquinolones, a class of antibiotics (like ciprofloxacin) often used for urinary tract or respiratory infections. These drugs can disrupt collagen synthesis. Patients taking them have a higher risk of Achilles tendon rupture, sometimes months after stopping the medication.
Corticosteroids. While steroid injections are excellent for reducing inflammation and pain in the short term, repeated injections directly into a tendon can weaken the tissue structure. can lead to a sudden rupture of a tendon that was previously just painful. Doctors are cautious to limit the number of injections for this reason.
High-impact sports are a major breeding ground for tendon injuries. Sports that involve jumping, cutting, and sudden acceleration place massive eccentric loads on tendons. An eccentric load happens when a muscle is contracting while it is lengthening—like the quadriceps when you land from a jump. This generates the highest amount of force and is the most common moment of injury for the patellar tendon (jumper’s knee).
Improper equipment or technique also plays a role. Running in worn-out shoes changes the alignment of the foot, placing extra stress on the Achilles or posterior tibial tendon. Poor lifting form at the gym can overload the biceps or pectoral tendons.
Your overall health directly impacts your tendon strength. Smoking is a major enemy of connective tissue. Nicotine constricts blood vessels, further reducing the already limited blood supply to tendons. Smokers have a significantly higher risk of rotator cuff tears and a much higher rate of failed surgeries because their tissues do not heal well.
Metabolic conditions like diabetes and high cholesterol also affect tendons. When blood sugar levels are high, collagen can “glycate,” which makes tendons stiff and more likely to snap. High cholesterol can lead to lipid deposits in tendons (xanthomas), weakening their structure. Obesity places a constant mechanical overload on the tendons of the lower body, accelerating wear and tear.
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You can reduce the risk by warming up properly, maintaining flexibility, and strengthening the muscles. Eccentric strengthening exercises are particularly beneficial for protecting tendons. Avoiding smoking and managing chronic diseases also helps.
Yes. Warming up increases blood flow and raises the temperature of the tendon, making it more pliable and elastic. A cold tendon is stiff and snaps easily; a warm tendon stretches.
This is usually a sign of pre-existing degeneration. The tendon was likely already frayed or weakened by age or disease (tendinosis), and the final movement was just the “straw that broke the camel’s back.”
It varies by tendon. Achilles ruptures are much more common in men. However, posterior tibial tendon dysfunction (flat foot) is more common in women. Hormonal differences and anatomy both play a role.
Yes, partial tears often heal with conservative treatment like physical therapy and rest. Surgery is usually reserved for partial tears that remain painful despite months of non-surgical care.
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