AAOS appreciates FDA’s communication on metal-on-metal hip components in total hip arthroplasty Orthopaedic surgeons raise awareness and offer information on hip alternative components to individuals, colleagues and medical community at-large The U.S sildenafil citrate 100mg . Food and Medication Administration today submitted a public health communication about metal-on-metal hip parts found in total hip arthroplasty . The American Academy of Orthopaedic Surgeons appreciates this comprehensive and well-considered look at the concerns surrounding the use of these implants.