Orthopedics focuses on the musculoskeletal system. Learn about the diagnosis, treatment, and rehabilitation of bone, joint, ligament, and muscle conditions.

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Overview and Definition

When we think of injuries, we often picture broken bones or dislocated joints. However, the vast majority of aches, pains, and functional limitations we experience in life are actually soft tissue injuries. “Soft tissue” is the medical term for the parts of the body that are not bone. This includes muscles, tendons, ligaments, fascia, nerves, skin, and blood vessels. These tissues connect, support, or surround other structures and organs of the body. They are the machinery of movement—the ropes, pulleys, and elastic bands that allow our skeleton to walk, run, lift, and twist.

Soft tissue injuries are incredibly common and can happen to anyone, from an elite athlete sprinting down a track to an office worker reaching for a file. They range from mild annoyances like a stiff neck after sleeping funny to severe, debilitating events like a ruptured Achilles tendon. Understanding what these injuries are and how they differ from one another is the first step in effective treatment. This section will guide you through the definitions of sprains, strains, and contusions, explaining the biology of the tissues involved so you can better understand what is happening under your skin when you get hurt.

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What is a soft tissue injury?

ORTHOPEDIC

A soft tissue injury (STI) is damage to muscles, ligaments, and tendons. These injuries usually result from a sudden uncontrolled movement, like a twist or a fall, or from excessive use over time. Unlike a fracture, where a rigid bone snaps, an STI involves the tearing, stretching, or bruising of flexible fibers. The body’s immediate response is inflammation—swelling, redness, and pain—which is the first step in the healing process.

However, because these tissues are soft and often have a limited blood supply compared to bone, healing can sometimes be slow and tricky. Scar tissue can form, making the area stiff and prone to re-injury. Recognizing the difference between a “good hurt” (like muscle soreness after exercise) and a true injury is vital for preventing long-term damage.

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Sprains vs. Strains: Knowing the Difference

ORTHOPEDIC

The terms “sprain” and “strain” are often used interchangeably in casual conversation, but medically, they refer to two very different injuries involving different structures. A sprain is an injury to a ligament. Ligaments are the tough, fibrous bands that connect bone to bone and hold joints together. When you roll your ankle, you are stretching or tearing the ligaments that keep it stable. Sprains happen in joints—ankles, knees, wrists, and thumbs.

A strain, on the other hand, is an injury to a muscle or a tendon. Tendons are the cords that attach muscle to bone. When you pull a hamstring or hurt your back lifting a heavy box, you have strained the muscle or tendon. Strains happen in the muscle belly or where the muscle tapers into the tendon. An easy way to remember is that “Strain” has a “T” for Tendon.

Grading the Severity

Doctors grade both sprains and strains on a scale of 1 to 3.

  • Grade 1 (Mild): This is a slight stretching of the fibers. There is some tenderness and mild pain, but you can usually still use the limb. It’s like overstretching a rubber band but not breaking it.
  • Grade 2 (Moderate): This type of injury involves partial tearing of the fibers. There is more pain, swelling, and perhaps some bruising. You might feel a loss of function or weakness. The “rubber band” has some nicks in it.
  • Grade 3 (Severe): This condition is a complete rupture or tear. The ligament or muscle has snapped completely. This type of injury causes severe pain (which might then disappear if nerves are severed), massive swelling, and complete loss of function. This condition often requires surgery.
ORTHOPEDIC

Contusions (Bruises)

“Contusion” is the medical term for a bruise. It happens when a direct blow or impact crushes the underlying muscle fibers and connective tissue without breaking the skin. This causes small blood vessels (capillaries) to burst, leaking blood into the surrounding tissues.

This pooled blood is what causes the black-and-blue discoloration. While most bruises are minor, a severe contusion deep in a large muscle (like the thigh) can be serious. It can lead to hematoma—a large lump of clotted blood—or even myositis ossificans, where bone tissue starts to grow inside the healing muscle. Contusions are common in contact sports.

Tendonitis and Bursitis

Not all soft tissue injuries are sudden. Many are overuse injuries. Tendonitis is the inflammation or irritation of a tendon caused by repetitive motion. Tennis elbow and jumper’s knee are classic examples. The tendon develops micro-tears faster than it can repair them.

Bursitis involves the bursa, a small fluid-filled sac that acts as a cushion between bones and tendons. We have bursae in our shoulders, elbows, hips, and knees. If you kneel too much or perform repetitive overhead motions, the bursa can become inflamed and swollen, causing a dull, aching pain. These conditions are “chronic” soft tissue injuries.

The Role of Fascia

Fascia is a connective tissue that wraps around every muscle, bone, and organ in the body like a spider web. It provides support and reduces friction. However, fascia can also be injured.

Plantar fasciitis is a common condition where the thick band of fascia on the bottom of the foot becomes inflamed, causing sharp heel pain. Myofascial pain syndrome involves painful “trigger points” or knots in the fascia and muscle. Understanding fascia helps explain why pain can sometimes “travel” or be felt in areas away from the original injury site.

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FREQUENTLY ASKED QUESTIONS

How can I tell if it is broken or just sprained?

It can be difficult to tell without an X-ray. However, if you cannot bear weight, if the limb looks deformed, or if there is bone tenderness (pain specifically when touching the bone), it might be a fracture. Sprains usually have pain located over the soft tissues.

Surprisingly, yes. A clean bone fracture often heals stronger than before within 6–8 weeks. A severe ligament sprain can take 3–6 months or longer to fully heal because ligaments have a poor blood supply compared to bones.

Not immediately. Stretching an acute strain can tear the fibers further. You should rest the muscle first and only begin gentle stretching once the acute pain has subsided.

A charley horse is a sudden, involuntary muscle cramp or spasm, often in the leg. It can also refer to a muscle contusion (bruise) caused by a direct blow to the thigh.

Yes. Scar tissue from old soft tissue injuries can be sensitive to changes in barometric pressure, causing aches and stiffness when the weather changes.

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