Thermoskin Patella Tracking Stabilizer Large 14.5 15.75 Dressing Aids Just place the sensor pad Patient Lifters Slings Parts Just place the sensor pad under a patient and engage the switch on your alarm monitor to trigger a loud audible alarm * The needle bearings that encompass the pedals and flywheel axle industrial grade Hutchinson Poly V belt and our three piece crank work synergistically to create the perfect formula for durability and performance Large * Has a fully adjustable internal buttress which ensures correct positioning and control of patella movement * Allows vertical tracking of the patella during vertical flexion extension * Assists in the treatment of patella problems including instability pain and subluxation (looseness)