Which of the following ligaments is stretched or torn in about 70% of all serious knee injuries?

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The question asks which ligament is stretched or torn in about 70% of all serious knee injuries.
Option 1: Popliteal ligament — This ligament is not commonly the primary injury in most serious knee traumas; injuries to it are relatively rare compared to the ACL in serious knee cases.
Option 2: Anterior cruciate ligament — This is the correct landmark for knee injury literature, as ACL tears or stretches account for a large majority of serious knee injuries, often cited around the 70% mark in various clinical series and sports medicine sources.
Option 3: Posterior cruciate ligament — The PCL is indeed injured in knee trauma, but far less frequently than the ACL; isolated PCL injuries are less common, and combined injuries involving the ACL are more typical when a “serious knee injury” occurs.
Option 4: Medial collateral ligament — MCL injuries are common in knee trauma, especially in contact sports, but they do not reach the same predominant share as ACL injuries in the context of severe knee injuries.
Option 5: Lateral collateral ligament — LCL injuries are relatively uncommon compared with ACL injuries; isolated LCL tears are rarer, and when a serious knee injury occurs, ACL involvement is typically the more prevalent pattern.

BIOL 251 Module 4 Problem Set

Which of the following ligaments is stretched or torn in about 70% of all serious knee injuries?

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