Lumbosacral Plexopathy in Pelvic Injury - A Cause of Hip Instability in Acetabular Fractures: A Report of Two Cases.

Lumbosacral plexopathy is a rare clinical entity that results in potentially severe neurological deficit. The clinical presentation of lumbosacral plexopathy includes motor and sensory deficits. However to the best of our knowledge, hip instability secondary to lumbosacral plexopathy has not been reported in current literature. We report two cases of pelvic injury in which recurrent hip subluxation occurred following fixation of acetabular fractures. We attribute this to inadequate hip muscle tension from the associated lumbosacral plexopathy. In patients with acetabular fractures, this may lead to debilitating hip joint instability. In an already traumatized hip joint, this instability has a poor prognosis and can lead to degenerative changes with the eventual need for hip replacement.