A locked pelvis, specifically a locked pubic symphysis, occurs when one pubic bone becomes entrapped behind the other after a lateral compression injury. This is a relatively uncommon result of lateral compression pelvic injuries.
In more detail:
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Mechanism of Injury: The condition typically arises from a lateral compression force applied to the pelvis. This force can cause one pubic bone to shift and become "locked" behind the opposing pubic bone at the pubic symphysis joint.
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Pubic Symphysis: The pubic symphysis is the joint where the two pubic bones meet at the front of the pelvis. It is normally slightly flexible, allowing for limited movement. However, significant trauma can disrupt this joint.
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Rarity: While lateral compression injuries to the pelvis are recognized, a locked pubic symphysis is a less frequent outcome. Most lateral compression injuries result in other types of pelvic fractures or dislocations.
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Consequences: A locked pelvis can cause significant pain and instability in the pelvic region. It can also impact gait and mobility. Diagnosis typically involves physical examination and imaging studies such as X-rays or CT scans.
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Treatment: Management of a locked pelvis often involves manual manipulation under anesthesia to unlock the pubic symphysis, followed by stabilization, which may involve surgery.
