This series of knee examination videos on Youtube was posted way back in 2008 by BJSM. In these videos Dr Mark Hutchinson demonstrates a full knee examination as part of a combined project and teaching initiative of the Centre of Hip Health and Mobility (CHHM) (Vancouver).
The video below is the first of 27 videos in this knee examination series. The first video is just a 30s introduction, you can view the other videos from there:
You can access the BJSM Youtube page where there are other video series on physical examination of the shoulder, hip etc. and a whole host of useful resources: