When teenagers come into the NBA, they oftentimes grow a few more inches, filling out into their full body size. This happened when the Milwaukee Bucks drafted Giannis Antetokounmpo a few years back. It's not uncommon in the slightest.

For New York Knicks rookie swingman Kevin Knox, he may still be growing. And his head coach David Fizdale believes that it's the reason why his knees are constantly in pain.

Even though the Knicks will likely be a lottery team this season, Kevin Knox has shown that his ability to score is legit. The 6-foot-9 scoring forward is putting up 12.2 points and 4.3 rebounds per game while shooting 37.7 percent from the floor, 35.9 percent from the 3-point line and 66.3 percent from the foul line.

Sure enough, it's not all rainbows and butterflies for Kevin Knox. He ranks 463rd out of 464 players in ESPN’s Real Plus-Minus. The Knicks have also given up 7.1 more points with him on the floor than off it, according to Cleaning the Glass, which is among the worst at his position. Statistically, he is one of the worst players in the league.

Knox is super lengthy at 6-9 with a nearly 7-foot wingspan; yet, he can’t seem to buy a rebound. His head coach David Fizdale has realized his struggles and has taken him under his wing. For this to change, Knox needs to work on his defense, be more aggressive when getting rebounds and, of course, taking smart shots.

The Knicks are 9-29 on the season and currently sit 14th in the NBA's Eastern Conference.