Hi, thanks for writing to HCM.
A permanent foot drop
cannot be attributed to an injury to the common peroneal nerve just because of regular sitting in a cross legged position. This particular position might have caused a TRANSIENT heavyness and numbness
in the foot owing to the concussion
(pressure on the nerve) but complete foot drop will never happen as there is no physical injury (transection) to the nerve.
A nerve conduction study
and EMG of the involved limb will help in diagnosing the problem.
Hope this information is helpful. Good day