Knee Replacements Saudi Arabia patient testimonial for Dr.A.K.Venkatachalam. A Saudi Arabia patient who underwent two knee replacements by Dr.A.K.Venkatachalam two and half years ago by Dr..A.K.Venkatachalam narrates her experience. Dr.Venkatchalam performs high flexion knee replacements for patients from Oman, Dubai, Saudi Arabia. The high flexion knee replacement allows patients to kneel and offer Namaz. See the testimonial video below. If you want this treatment, please e mail firstname.lastname@example.org.