What causes pain in L4-5 and L5-S1?
Infrequently, the facet joints of L4-5 and L5-S1 can cause pain in the lateral calf, and rarely into the foot. Radicular symptoms are not commonly seen with facet arthropathy. However, osteophytes, synovial cysts and occasionally facet hypertrophy may manifest as radicular pain. Pain due to facet involvement is often described as a "deep, dull
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