Spontaneous Compression Fracture on the Instrumented End Vertebra: A Case Report

STUDY DESIGN: A case report. OBJECTIVES: This case report presents an elderly male who sustained compression fractures twice on the instrumented end vertebra following a spinal fusion with pedicle screws. SUMMARY OF LITERATURE REVIEW: Because of its low incidence, there is considerable debate regarding an optimal treatment of adjacent segment fracture after long lumbar fusion. Almost all of the reports about adjacent segment fracture are about adjacent vertebral fractures rather than the instrumented vertebral fractures. MATERIALS AND METHODS: A 69 year-old male who was admitted with low back pains of no apparent physical injury underwent pedicle subtraction osteotomy and posterolateral fusion for L3 vertebral fracture and post-traumatic kyphosis. Extension of the fusion segment was performed two months after the initial operation to correct his compression fracture of the instrumented end vertebra, followed by conservative treatments due to a second compression fracture of the instrumented end vertebra two months after the second surgery. RESULTS: Conservative treatment was performed with TLSO brace, after which the fracture was gradually stabilized. CONCLUSIONS: Further research via additional case studies is required to better understand its cause and to develop effective treatment options.

Change of Deformity due to Position and Anesthesia in Adolescent Idiopathic Scoliosis / 대한정형외과학회잡지

PURPOSE: To determine changes in the end vertebra and neutral vertebra as well as in the magnitudes of coronal and rotational deformities according to position and anesthesia in patients with adolescent idiopathic scoliosis. MATERIALS AND METHODS: Sixty-two structural curves in 31 patients were evaluated using standing, supine, side bending, post-anesthesia, and postoperative anteroposterior plain radiographs. Cobb angles and rotation angles by perdriolle torsionmeter were measured, and the end vertebra and neutral vertebra were identified in each radiograph. RESULTS: Coronal cobb angles decreased significantly with correction rates of 25.0%, 31.7%, 59.5%, and 74.0%, and rotational deformities decreased with correction ratesof 6.1%, 24.5%, 6.2%, and 25.7% by supine position, anesthesia, side bending and surgery, respectively.The end vertebrae changed in 18 patients (58.1%) in both supine and post-anesthesia radiographs, and the neutral vertebrae changed in 10 patients (32.3%) in supine radiographs and in 20 patients (64.5%) in post-anesthesia radiographs. CONCLUSION: Coronal deformities are significantly corrected by supine position and anesthesia. Anesthesia significantly corrects axial rotation, but more correction cannot be achieved by rod derotation. The end vertebra and neutral vertebra have a tendency to vary by position and anesthesia, which gives rise to confusion in the determination of fusion level.