Thermoskin Patella Tracking Stabilizer X Large 15.75 17 Whirpool Chairs Tables Battery Capacity: 90mAh Hip Kits Battery Capacity: 90mAh 5 inch caster wheels are great for indoor and outdoor use * Deluxe hand brake can be pressed when needed or pushed down to lock rollator into place * Removable hinged padded backrest can be folded up or down * Easily folds for transport or storage * Handle height: 31 35 * Inside hand grip width: 17 * Seat depth: 12 * Seat width: 12 * Unit dimensions: 23 X 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)