OWCP will tell you that they are not a disability retirement program.
Essentially, you file a notice of recurrence of disability, form CA 2a and your doctor must write a detailed medical report explaining how your accepted injuries have worsened to the point that you are no longer able to work, even with work restrictions.
Much easier said than done.
Moreover, even if you get approved, there's a good chance OWCP will require you to go thru Voc Rehab unless your doctor really makes a strong case that you cannot work at all.
You might want to explore filing a disability retirement claim with OPM as a back up. Might not be as much money, but could be a lot less stressful. Unless you are CSRS, you also will need to file for Social Security disability as well. At the very least, it gives you optionsm even if OWCP is approved.