Fig. 1

Knee extensor machine and settings a side view b knee position 1–10; this also helped secure the 90◦ starting position of the knee. c front view d padded leg rest setting: Small, Medium, Large and Extra large; this position determined where the padded leg rest will place pressure on the shin and was normally placed above the ankle e back seat rest setting 1–10; this was normally positioned so that the back of the knee rested comfortably over the machine’s seat-edge, with the shin hanging perpendicularly to the ground