10 weeks ago i was told that i have a contusion in my left knee. i still can't bend it or twist it. is that normal?

Not normal: If you knee has not returned to normal functioning after 10 weeks you need to be evaluated by and orthopaedic surgeon. You may have an internal derangement, such as, a torn meniscus that is causing the continued problem. You probably will need an MRI to help to identify the cause of the lack of motion and pain with torque.

Yes: Quad contusion can be very painful and limit knee flexion 2 months.