When you accept scheduled awards under the Federal Employees' Compensation Act (FECA) as a lump sum as you did, you also agree that any future increases that might otherwise have been made, will not be made. There also is a discount for advance payment. As part of taking that lump sum you signed an agreement acknowledging your understanding of these issues. You also agreed that if you had a recurrence of disability before the ending date of the scheduled award, you would not be entitled to wage loss benefits until after the original ending date of the scheduled award.
In FECA land, COLA's usually are effective on March 1st of each year. (There was no COLA in 2009, however.)
For example, you were given a scheduled award for the period between 08/01/2009 to 09/30/2010. Instead of receiving ongoing four weekly payments, you elected to accept a lump sum of future payments effective 11/01/2009. OWCP pays you a lump for the moeny that would otherwise have been payable to you between 11/01/2009 to 09/30/2010, subject to a 4% discount.
As part of accepting that lump sum when you di, you gave up the right to the 03/01/2010 COLA adjustment.