In this video, Dr. Matt delves into the realm of musculoskeletal injuries, comparing ligamental sprains to muscle strains. Sprains, injuries to ligaments, commonly occur in the ankle (anterior talofibular ligament), wrist (radial or ulnar), and knee (anterior cruciate ligament). On the other hand, muscle strains typically affect superficial muscle groups like the quadriceps (rectus femoris), hamstrings (semitendinosus), and calf (gastrocnemius).
The mechanism of injury for both sprains and strains involves excessive tensile forces. In sprains, these forces damage the ligament, while in strains, they disrupt muscle fibers or cause a muscle-tendon unit rupture. The severity of the injury is graded on a scale from one to three, with grade one indicating mild pain and swelling, grade two signifying a partial tear with moderate pain and difficulty bearing weight, and grade three representing a complete tear with severe pain, swelling, and instability.
In the case of sprains, grade one involves ligament overstretching and minor tears, allowing the individual to bear weight with mild pain and swelling. Grade two sprains result in partial ligament tears, causing moderate pain, swelling, and weight-bearing challenges. Grade three sprains involve complete ligament tears, leading to severe pain, swelling, and joint instability. Muscle strains follow a similar grading system, with grade one indicating mild interstitial muscle strain and pain only upon stretching, grade two involving partial muscle disruption with pain and swelling, and grade three representing a complete muscle rupture with severe pain, swelling, and loss of function.