Wall slides are rehabilitation exercises.
Water on the knee refers to excess fluid inside the knee joint cavity (effusion) or excess fluid within pockets (bursae) around the knee (bursitis).
This is a classification of patellar shape, which is simply used in describing patellae.
The combination of a bow leg on one side with a knock knee on the other.
A useful item of rehab equipment.
The WOMAC is a scoring system for functional disability from osteoarthritis (WOMAC=Western Ontario and McMaster Universities).