The allegations come in a legal complaint filed Monday over the November crash at Harrah's racetrack in suburban Chester.
Lawyers say 31-year-old Anthony Coletta of Hudson City, N.J., suffered brain damage and other injuries when a horse in front of him stumbled, throwing him from his cart.
The complaint, filed by lawyer Michael Barrett, says that Harrah's "turned a blind eye" to complaints the track was dangerous.
"Our son Anthony is in the race of his life and it is a race he is - like all of his other races - is out to win. He doesn't pay attention to the odds, and neither do we. He is a winner in every way," said Anthony Coletta's father, Fred Coletta.
Harrah's lawyer Larry Kelly told the Associated Press he has not seen the complaint and has no immediate comment. Harrah's is owned by Caesar's Entertainment Corp.
The Philadelphia Common Pleas suit is filed on behalf of Coletta and his parents, Alfred and Rosemary Coletta of Hammonton, N.J.