Repeated recurrence of thoracic spine stenosis following decompression alone for ossification of the ligamentum flavum: case report.

Ossification of the ligamentum flavum (OLF) is a well-recognized but rare cause of thoracic myelopathy. Its subtle and variable clinical presentation often makes the diagnosis challenging. The treatment of symptomatic OLF requires surgical intervention, with the most common surgical procedure being a posterior decompression with or without instrumentation. Recurrence of ossification and stenosis after surgery is rare and usually occurs at the same intervertebral level. Multiple recurrences of ossification and stenosis are exceptionally rare. The authors report the case of OLF in a 60-year-old man who experienced recurrence of ossification and stenosis twice after posterior decompression surgeries alone. The patient was ultimately treated with revision decompression and instrumented fusion. The authors also present a pertinent review of the literature.