Hello and welcome to HCM.
As an
Urologist,i must assure you,there's nothing to worry about.
Horseshoe kidney is just a congenital(by birth),variant of normal kidney.
It's position is lower than the normal placed kidneys.
Hence, instead of the kidneys being in the two flanks at the back, it's located in front lower part or pelvis.
This abnormal location on the front side, doesn't affect function of kidney.
Falling forwards on a hard object or sharp object has a potential threat of
injury to the kidneys, which's easily made out on a scan.Hope you're relieved of your doubts.
You can get my expert opinion, sending it as a direct question.
Dr.Matthew J. Mangat.