"In the hospital thanks to @khloekardashian (Look at her page for the reason why)," the reality starlet, 16, wrote on Instagram Tuesday to accompany a photo of her covering half her face. "My mom said, 'Never thought I would take u to the doctor for a trampoline accident at this age.' This means war Khloe. Ps. It was painful taking this photo."
But big sis Kardashian, 29, didn't express much remorse for the ailing Jenner.
She began with a four-way shot of the ladies tackling each other, writing on Instagram, "This started out calm and ended in a war! Sorry @kyliejenner."
She went on to write in a separate Instagram post, "Kylie this is proof you did it to yourself! Sorry not sorry! Just kidding I am sorry my little bug a boo!! Let the war continue!!!!"
Kardashian continued to find matters amusing, even posting Kylie's Instagram on her own page, with the caption, "Lol I love you @kyliejenner."
But Jenner's accident didn't ward off fellow sibling Kim Kardashian, who was photographed jumping alongside Khloé.
"Lady and the tramp," Khloé wrote on Instagram. "You pick who's who."