妨碍中篮，（英语：Goaltending，又称俗称勾天顶)为篮球术语，是指篮球比赛中非法干扰已出手且正在下降轨迹或正在篮框上的球。若防守球员封阻的时间太迟，球已在空中过最高点或是已碰触篮板，则为防守干扰违例，判进攻方成功得分；而若进攻球员干扰（如射球后，球还未离开篮框的上空便把球拨入），则判进攻干扰违例，防守方得控球权，这种情况称为篮上干扰 (basket interference)，干扰球又称为进攻妨碍中篮，经常被球迷与妨碍中篮混乱。

总结来说，球员在篮球尚未离开篮框上方圆柱体时，侵犯圆柱体的区域使己方球队获利，则会判决：

In basketball, goaltending is the violation of interfering with the ball while it's on its way to the basket and it is (a) in a downward flight and might not go in, (b) entirely above the rim and has the possibility of entering the basket, and (c) not touching the rim. In NCAA basketball, WNBA and NBA basketball, goaltending is also called if the ball has already touched the backboard while being above the height of the rim in its flight, regardless of whether it being in an upward or downward flight or whether it is directly above the rim. Goaltending in this context defines by exclusion what is considered a legal block of a field goal. In high school and NCAA basketball, goaltending is also called when a player interferes with a free throw at any time in its flight towards the basket. If goaltending is called for interference with a field goal, the shooting team is awarded the points for the field goal as if it had been made. In high school and NCAA basketball, if goaltending is called on a free throw, the shooting team is awarded one point and a technical foul is called against the offending player.