I fell 6 weeks ago and hurt both knees. I
Due to mild nerve root compression.
Thanks for posting your query.
It seems that the fall on the behind has caused a jerk in the spine and there is a mild nerve root irritation or compression at the level of lower spine that is causing the symptoms.
The tingling is likely to improve with increased fluid intake and methylcobalamin supplements. You can get an MRI scan done to confirm this.
I hope this answers your query.
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Wishing you good health.
Dr. Praveen Tayal.