Thank you for query,
As you had hard fall you might got soft tissues injury
giving rise to your present problem.
Due to injury your muscles and joints become stiff and possible that you might got infection too,as there are bruses on the part.
As you got sciatic type of pain some damage can be there in vertebrae or inter vertebral
disc might not giving impression in X-ray.
So consult your orthopedic again and seek his advice.
Ok and bye.