Causes. Leg length discrepancies can be caused by poor alignment of the pelvis or simply because one leg is structurally longer than the other. Regardless of the reason, your body wants to be symmetrical and will do its best to compensate for the length difference.
Date of Onset. When the Social Security Administration (SSA) refers to a disability applicant's Date of Onset, they are referring to the date that a Social Security Disability applicant became disabled. When you fill out your Social Security Disability claim forms, you will be asked to provide the date your disability began.
In several unofficial Social Security benefit resources, the average wait time is estimated to be approximately 90 days before the first monthly SSDI check is issued. You will receive two, possibly three different checks. The first check is your monthly SSDI award. This amount is determined by the length of time you worked in the past and how much you contributed to SSA. The second check is Social Security Disability back pay. The amount that you receive in back pay is determined by the date that you became disabled (for this purpose, disability means the point at which you became unable to work enough to be considered substantial gainful work activity, or SGA, the current 2009 SGA is $980/month.