Robert M. Brenner, MD - CLOSED

Dr. Ralles is an orthopedic surgeon at Allina Health Chaska Clinic. He specializes in hip and knee replacement, total joint replacement, robotic surgery, and hip and knee arthritis. Dr. Ralles works with each patient to develop a treatment plan unique to the patient's circumstances and goals so that they can regain mobility and improve their quality of life.

Twin Cities Orthopedics is committed to providing world-class service to everyone we encounter. Our independent orthopedic specialists deliver individualized care informed by active research and outcomes data. TCO prides itself on being an innovative, nimble organization that can adapt quickly to an ever-changing healthcare environment. Our dedicated teams of physicians, specialty providers and care coordinators serve our patients in clinic locations, walk-in Orthopedic Urgent Care locations, and numerous other therapy and specialty care settings across Minnesota and western Wisconsin. Regardless of the location, TCO delivers an exceptional patient experience, backed by decades of trusted orthopedic care.

Peter C. Sanders is a board certified orthopedic surgeon who specializes in arthroscopic reconstructive surgery, minimally invasive joint replacement and fracture care. Dr. Sanders completed his medical school training and his orthopedic surgery residency at the University of MN in Minneapolis, MN. He practices in Chaska, Waconia and Olivia. Dr. Sanders enjoys partnering with Compassion, World Vision, World Wide Village, International Justice Mission and Hope Academy to help provide educational and medical opportunities for the underserved both locally and abroad. He has recently visited Zimbabwe and Haiti on medical missions trips. When not working, he enjoys spending time with his wife and two children. Interests include fishing, biking, golf and playing the drums.