The Sister-Unit missed a step coming down from a high step stool, and slammed all her weight onto her left knee, crashing her to the ground. Urgent care says it's just a sprain, and she should stay off it a couple days. Since she has work the next two days, she seems to think she'll ignore that and go anyway.
I suspect she won't be able to. She was in a lot of pain this evening, and I had to take care of her constantly. The knee won't bear her weight, and the huge brace is uncomfortable because she put a big bruise on her butt when she hit the ground.