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Sciatica may also occur during pregnancy, especially during later stages, as a result of the weight of the fetus pressing on the sciatic nerve during sitting or during leg spasms. [15] While most cases do not directly harm the woman or the fetus, indirect harm may come from the numbing effect on the legs, which can cause loss of balance and falls.
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]
A sciatic nerve injury occurs between 0.5% and 2.0% of the time during a hip replacement. [7] Sciatic nerve palsy is a complication of total hip arthroplasty with an incidence of 0.2% to 2.8% of the time, or with an incidence of 1.7% to 7.6% following revision.
The sciatic nerve is responsible for both muscle movement and sensory sensations of the legs. Sciatica is typically characterized by nerve pain like numbness, weakness, burning, or tingling ...
1764: Domenico Cotugno describes sciatica as a disease of nervous origin. [89] 1881: Lasegue's sign is described for the diagnosis of sciatica. [90] 1916: Tardy nerve palsy is described in ulnar nerve. [91] 1934: Theory that a spinal disc pressing on the spinal cord can cause sciatica is introduced. [92] 1947: Piriformis syndrome is described. [93]
A heavily scrutinized anatomic variation involves sciatic nerve branching around the piriformis using the 6-category classification first described by Beaton and Anson. In this classification, the normal anatomy (type A) seen in about 80% of people is where the sciatic nerve passes under the piriformis muscle at the greater sciatic notch.