Musculoskeletal Injuries and Immobilization

Musculoskeletal Injuries and Immobilization

1. Fracture, strain, sprain, dislocation, sort them first

Four things go wrong at a joint or a bone, and you need to tell them apart before you can treat them.

A fracture is the bone itself breaking. You're going to see crepitus. That's the grinding of bone ends against each other. Plus deformity, swelling, pain with movement, and sometimes false motion, where the limb bends somewhere it shouldn't.

A strain is the muscle. Something contracts wrong and the muscle stretches, tears, or rips. The patient often feels or hears a snap, the pain is sharp and immediate, and the muscle is suddenly weak. Point tenderness is extreme, right over the tear.

A sprain is the ligament, plus the joint capsule, the synovial membrane, and the tendons crossing that joint. The swelling shows up at the joint. That's the tell. There's often a snap at the moment of injury too, and point tenderness right at the joint line. The ankles, knees, and shoulders are the joints that sprain most.

A dislocation is the joint surfaces separating completely. The deformity is obvious, the pain is severe, and the limb sits in a position it has no business sitting in.

Strain versus sprain is a definition item. The exam locks it down hard: strain is muscle, sprain is ligament. Memorize which word owns which tissue and you've closed off a whole category of wrong answers.

Here's the fact that actually runs your treatment decision, though. You cannot reliably tell a sprain or a strain from a fracture in the field. You don't have an X-ray on the ambulance. When you can't classify it, the rule is simple: manage it as a fracture. That one instruction answers a whole family of exam items. Whenever the stem hands you an injury you can't pin down, immobilize it like a break.