Submit Your Testimonial About the Experience How was your overall experience?: Poor Good Best Satisfactory Excellent Comments: Dr. Darr did knee replacements on both my knees. The surgeries were about 3 years apart, and he made a few improvements in the interim. Both my "bionic" knees work perfectly - no pain, I have great range of motion, and not-horrible scars. He is very caring; he even called me from a Florida vacation, to see how I was doing!