Westbrook, who was in the midst of recording three straight triple-doubles, took an inadvertent knee to the face from teammate Andre Roberson in the closing seconds of Friday's loss and was clearly shaken up. He stayed in the game but was taken to a Portland hospital afterwards.
D.J. Augustin posted 18 points, nine boards and five assists, while Enes Kanter added 16 points and 15 rebounds for the Thunder, who had lost two straight coming in on the heels of a seven-game winning streak.
Jeremy Lin led the Lakers with 20 points, eight assists and six rebounds.
After a Ryan Kelly 3-pointer clawed the Lakers within 74-69 late in the third quarter, the Thunder closed the frame on a 10-3 run.
Darren Collison sparked the surge with a three-point play and Ibaka capped it by tipping in his layup miss for an 84-72 cushion.
LA never cut the deficit below six in the fourth.
Earlier, Roberson nailed a pair of triples as OKC raced out to a 9-2 start before leading 28-19 following a quarter of play.
Augustin knocked down a triple at the first-half horn to stake the Thunder to a 56-48 advantage at the break.
Westbrook's status going forward is day-to-day ... Kanter returned from a one- game absence due to a right thigh contusion ... OKC improved to 5-10 when neither Durant or Westbrook play ... Both teams turned the ball over just nine times.