MAKO Surgical Corp. (MAKO) is a medical device company that markets its robotic arm solution and orthopedic implants for orthopedic procedures called MAKOplasty. The Company offers MAKOplasty, a surgical solution that enables orthopedic surgeons to treat patient specific, osteoarthritic disease. MAKOplasty is performed using its RIO Robotic Arm Interactive Orthopedic system (RIO). The RIO is a technology platform that utilizes tactile guided robotic arm technology and patient specific planning and visualization to offer reproducible precision to surgeons. MAKOplasty procedures are enabled through its technology consisting of the components, which includes RIO system, MAKOplasty applications, and RESTORIS family of implant systems. The RIO is used to treat early to mid-stage osteoarthritic knee disease and osteoarthritic hip disease. During the year ended December 31, 2011, a total of 48 RIO systems were sold worldwide.