him
Thank you for providing the brief history of you.
A thorough neuromuscular assessment is advised.
As you had a fall from the stairs, the mechanism of
injury indicates the strain in the
lumbar spine and due to which the below knee sensation is disturbed, but without a clinical examination we can not come to conclusion.
Also, the
bruise and other factors are just external injuries and they heal with simple medication too.
As the pain is travelling in nature from bum to knee, and weight bearing gives intense pain it could be a pinched
nerve as well or a muscular spasm.
Undergoing an MRI of lumbar spine can make some deep understanding of the issue and assist further.
Usually such injuries and symptoms improve with simple medication, rest and
physical therapy in our clinical practice.
Regards
Jay Indravadan Patel