The rotation changes before the box score notices
Joel Embiid returned from ankle and hip soreness in Game 3 against the Knicks, and New York still went up 3-0 on Philadelphia. That is the cleanest way to start the answer: playoff injuries do not change rotations like a blank space on a spreadsheet. They change the shape of the floor.
When a starter is out, limited, or just moving differently, the question is not simply, "Who takes those minutes?" The question is where the next player stands, who that player can guard, whether the ball still has enough handlers, and which matchup the opponent can touch again and again until the lineup bends.
That is why "next man up" is usually too small for playoff basketball. It sounds tidy. The floor is not tidy.
One replacement can move four jobs
A healthy rotation is full of quiet agreements. One player gives the offense spacing in the corner. Another lets the best scorer avoid the hardest defensive assignment. A wing takes the first crack at a dangerous guard so the help behind him is not already tilted. A secondary ballhandler keeps the first action from dying when the defense takes away the easy catch.
Remove one of those pieces and the team does not just lose a name. It may lose a corner defender, a pressure release, a clean passing angle, or the one body that let everyone else keep their natural matchup.
That is the rotation problem. A coach can find another player. Finding another lineup that still protects the same geometry is harder.
OG Anunoby being out again for Game 4 against the 76ers is a good example of the kind of absence that creates more than a minutes question for New York. The empty spot is not only about replacing a forward. It is about what happens to wing assignments, floor balance, and the lineup combinations that keep the Knicks from overloading one player with too many jobs.
Injuries also tell opponents where to press
Philadelphia's issue with Tyrese Maxey against the Knicks has been connected to pressure from Mikal Bridges and Jalen Brunson. That matters because playoff rotation changes are not made in isolation. They are made while the other team is actively searching for the loosest screw.
If a ballhandler is already having trouble getting clean angles, a lineup change can make the next catch arrive later. If a replacement defender cannot handle the same matchup, help has to lean earlier. If help leans earlier, the weak side has to rotate sooner. By the time the shot goes up, the injury has touched the possession in three different places.
A cold miss and a forced miss can look the same after the fact. They do not feel the same when the pass is late, the first drive has met a body, and the clock is starting to take the good options away.
Coaches protect lineups, not slogans
Recent Knicks coverage has described Mike Brown as managing the rotation effectively in this series. That is the right lens for this question. Playoff coaches are not handing out minutes because the depth chart looks polite. They are trying to keep five-man groups functional.
Sometimes that means the obvious replacement plays less than fans expect. Sometimes it means a smaller lineup survives because it gives the offense another handler. Sometimes it means a bigger lineup stays because one defensive matchup matters more than the spacing cost.
The point is not that injuries always make a team worse in one simple way. The point is that they force every lineup to answer the same possession question again: can this group still create a clean first action, cover the dangerous matchup, and avoid giving the opponent an easy target?
That is why playoff injuries change rotations. Not because coaches forget the depth chart. Because the depth chart does not have to guard the second action, make the late pass, or survive the matchup the other bench has already circled.