I had hip replacement surgery done by Dr Matsen Ko in July, 2016. The preparation for surgery was excellent. I was able to attend the pre surgery seminar and learned ahead of time what to expect. I was given exercises to do ahead of surgery to facilitate a smooth recovery. The staff at OPA worked well together; each person knowing their job and doing it well. It’s been 3 months now and I am able to swim a mile and walk 2 miles! I am back to my regular activities.