Isolated Bilateral Pedicle Fractures of L5 Without Underlying Predisposing Factors: A Rare Case Report

We report a rare case of isolated bilateral pedicle fractures in the lumbar spine that occurred without any identifiable risk factors. Such fractures are uncommon, as they are typically accompanied by multiple other fractures. This type of fracture is commonly associated with widely acknowledged predisposing factors, including high-energy trauma, degenerative spine disease, previous spinal surgery, stress-related activities, or osteoporosis. Additionally, some reports suggest these fractures can result from low-energy trauma when underlying conditions such as osteoporosis are present. This report describes a 43-year-old female who presented with gradually aggravating low back pain in the absence of any significant trauma history. Initially, she denied any preceding injury, considering the event too trivial to mention. However, upon detailed history taking, she later recalled minor contact with the edge of her bed two days prior to symptom onset. Conservative management, consisting of administration of painkillers, adequate rest, the use of a brace, and rehabilitation exercises, led to significant improvement, with marked relief of clinical symptoms and fracture healing observed in follow-up imaging. Early identification and appropriate management of isolated pedicle fractures are essential, as delayed diagnosis may lead to chronic pain or long-term sequelae. Furthermore, unilateral fracture can increase mechanical loading on the contralateral pedicle, making it vulnerable to secondary stress injury. Therefore, clinicians must remain alert to the possibility of isolated pedicle fractures even in patients without risk factors. Thorough history taking is also essential, as unrecognized minor trauma may hinder timely diagnosis and optimal outcomes.