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Based on causes PS is classified into two types: Primary PS (< 15%) Secondary PS occurs as a result of a precipitating cause, including trauma (approx. 50%), ischemic mass effect, and local ischemia. The trauma is usually not dramatic and may occur several months before the initial symptoms. Trauma to the buttock leads to pain-spasm-inflammation-Irritation cycle. The stretched and inflamed piriformis muscle may compress the sciatic Nerve
Gopal Nambi (Mon,) studied this question.
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