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.
This last part of your SSDI retroactive pay calculation is relatively simple. Once your disability onset date has been established, you must wait five months after that date before you will become eligible for benefits. This is referred to as the 5 month waiting period, and it applies to all SSDI benefit recipients.