Patella Luxation:

Also called slipping kneecap or popping knee, this condition is mostly inherited but may in rare cases be caused by trauma. Conditions that predispose to dislocation of the patella are a shallow groove, weak ligaments and malalignement of the tendons and musclesthat straighten the joint. The patella slips in- or outward. The signs may include difficulty straightening the knee, pain in the stifle (knee joint) and lameness. The diagnosis is confirmed by manipulating the stifle joint and pushing the kneecap in and out of position. Treatment involves surgery to deepen the groove and/or re-align the tendon. Like with other orthopedic conditions presumed to be hereditary, Swissys with non-traumatic patella luxation should not be bred