dmoney,
Your note does not state exactly where you are in the injury/recovery/disposition process. Are you writing your letter a week out from your injury, or are you a year out and are looking at a non-healed fracture?
Your medical and administrative disposition will be driven by your condition and degree of recovery. If you have been recently injured and the expected time for recovery is greater than 90 days, the correct (not always followed by medical, by the way), will be to place you on Limited Duty (LIMDU) status. That administrative function is called a "Medical Evaluation Board", and is a product of the local military hospital. That request is submitted to PERS, who reviews the information provided by your treating physicians. We generally approved LIMDU as requested, but not always. Limited duty is granted by PERS, and has an initial 6 month period, which can be extended for another 6 month period if your physician requests one. If your injury heals completely before your period of LIMDU is complete, your orthopedic surgeon will return you to full duty, at which point you'll be back in the mix for orders if your PRD is up.
If you don't get well after two periods of LIMDU, you physician should refer your case to the Physical Evaluation Board (PEB) for disposition. Additional periods of LIMDU can be requested, but when I was in that chair, a third period of LIMDU was generally not approved. The Navy had little interest in retaining people that couldn't be assigned, but who counted against authorized end-strength.
R/