Derek Ervin Smith (November 1, 1961 August 9, 1996) was an American professional basketball player. He won a national championship with the Louisville Cardinals in 1980, and spent nine years in the NBA in a career shortened by a knee injury. He would later become an assistant coach for the Washington Bullets from 1994 until his death.

Based on that paragraph can we conclude that this sentence is true?
Derek Ervin Smith only had a knee injury throughout his career.
It's impossible to say