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Dysfunction of the superior cluneal nerves is often due to entrapment as the nerves cross the iliac crest – this can result in numbness, tingling or pain in the low back and upper buttocks region. Superior cluneal nerve dysfunction is a clinical diagnosis that can be supported by diagnostic nerve blocks. [1]
Meralgia paresthetica is a specific instance of nerve entrapment. [5] The nerve involved is the lateral femoral cutaneous nerve (LFCN). [6] [7] [4] [8] The symptoms are purely sensory because the LFCN has no motor function. [4] This syndrome can be caused by anything which places prolonged pressure on the LFCN, such as wearing a tight belt.
It can reliably identify spinal nerve root compression for L2, L3, and L4. [2] It is usually positive for L2-L3 and L3-L4 (high lumbar) disc protrusions, slightly positive or negative in L4–L5 disc protrusions, and negative in cases of lumbosacral disc protrusion. [3]
Symptoms of LSS, including NC, are the most common reason patients 65 and older undergo spinal surgery. Surgery is generally reserved for patients whose symptoms do not improve with nonsurgical treatments, and the main objective of surgery is to relieve pressure on the spinal nerve roots and recover normal mobility and quality of life. [10]
The third lumbar spinal nerve (L3) [3] originates from the spinal column from below the lumbar vertebra 3 (L3). L3 supplies many muscles, either directly or through nerves originating from L3. They may be innervated with L3 as single origin, or be innervated partly by L3 and partly by other spinal nerves. The muscles are: quadratus lumborum ...
The nerve roots from L4–S4 join in the sacral plexus which affects the sciatic nerve, which travels caudally (toward the feet). Compression, trauma or other damage to this region of the spinal canal can result in cauda equina syndrome. [citation needed] The symptoms may also appear as a temporary side-effect of a sacral extra-dural injection. [9]
Peripheral neuropathy may be classified according to the number and distribution of nerves affected (mononeuropathy, mononeuritis multiplex, or polyneuropathy), the type of nerve fiber predominantly affected (motor, sensory, autonomic), or the process affecting the nerves; e.g., inflammation (), compression (compression neuropathy), chemotherapy (chemotherapy-induced peripheral neuropathy).
The timing/duration of symptoms may be continuous, intermittent, and/or positional. This is dependent on the underlying cause of entrapment and the specific nerves involved. For example, pain while sitting is associated with inferior cluneal nerve entrapment, pudendal nerve entrapment, and anococcyeal nerve entrapment. [11] [12] [13]