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A case of intractable knee pain caused by a foraminal herniated disc at the L3-4 level is reported. A 71-year-old man complained of intractable pain in the left knee despite having an unremarkable arthroscopic exploration at another hospital. Along with computed tomography and magnetic resonance imaging, coronal source images from magnetic resonance myelography revealed the foraminal herniated disc severely compressing L3 dorsal root ganglion at the L3-4 level. Surgical removal of the foraminal herniated disc at the L3-4 level improved his knee pain. The possibility of a foraminal herniated disc at the L3-4 level should, therefore, be included in the differential diagnosis of patients presenting with acute intractable knee pain.

Intractable Knee Pain Caused by Foraminal Disc Herniation at the L3-4 Level