Myasthenia gravis. Myasthenia gravis (MG) is an autoimmune disease that weakens the muscles. The name comes from Greek and Latin words meaning grave muscle weakness. But most cases of MG are not as grave as the name implies. In fact, most people with MG can expect to live normal lives.
To be more precise, it is when a player records double-digit values for three statistical categories. A basketball player accomplishes a triple double by reaching double digits in 3 of the following: assists, rebounds, points, steals, and blocks. In most cases the 3 doubles are assists, rebounds, and points. There have also been 4 quadruple doubles in the NBA, when players reached double digits in 4 of the above stats.
Garnett led the league in double-doubles this season with 71, the most in the NBA since Hakeem Olajuwon registered 72 during the 1992-93 season. He became only the fifth player in NBA history  and first in 29 years  to lead the league in total points (1,987) and total rebounds (1,139) in the same season.