Section 287.220.1 RSMo creates the Second Injury Fund and provides the framework for analyzing whether the Second Injury Fund may be liable for permanent total or permanent partial disability benefits. That section provides, in relevant part:
> If any employee who has a preexisting permanent partial disability whether from compensable injury or otherwise, of such seriousness as to constitute a hindrance or obstacle to employment or to obtaining reemployment if the employee becomes unemployed, and the preexisting permanent partial disability, if a body as a whole injury, equals a minimum of fifty weeks of compensation or, if a major extremity injury only, equals a minimum of fifteen percent permanent partial disability, according to the medical standards that are used in determining such compensation, receives a subsequent compensable injury resulting in additional permanent partial disability so that the degree or percentage of disability, in an amount equal to a minimum of fifty weeks compensation, if a body as a whole injury or, if a major extremity injury only, equals a minimum of fifteen percent permanent partial disability, caused by the combined disabilities is substantially greater than that which would have resulted from the last injury, considered alone and of itself, and if the employee is entitled to receive compensation on the basis of the combined disabilities, the employer at the time of the last injury shall be liable only for the degree or percentage of disability which would have resulted from the last injury had there been no preexisting disability. After the compensation liability of the employer for the last injury, considered alone, has been determined by an administrative law judge or the commission, the degree or percentage of employee's disability that is attributable to all injuries or conditions existing at the time the last injury was sustained shall then be determined by that administrative law judge or by the commission and the degree or percentage of disability which existed prior to the last injury plus the disability resulting from the last injury, if any, considered alone, shall be deducted from the combined disability, and compensation for the balance, if any, shall be paid out of a special fund known as the second injury fund.
We agree with the administrative law judge's determination that employee is not permanently and totally disabled. Accordingly, the question is whether employee is entitled to benefits for any enhancement of permanent partial disability resulting from a combination of his preexisting conditions of ill and the primary injury. We have found that, as of May 22, 2000, employee suffered from preexisting low back pain, a learning disorder, and depression, and that these conditions were permanent partially disabling conditions of such seriousness as to constitute hindrances or obstacles to employment.
Section 287.220.1, set forth above, provides thresholds which operate to exclude liability for de minimis injuries. Here, employee's preexisting conditions did not amount to a "major extremity injury only," so the 15 % threshold is inapplicable. Rather, because employee had more than a single preexisting disabling condition, we apply the 50-week "body as a whole" threshold.
We have found employee suffered a 2 % permanent partial disability of the body as a whole referable to his preexisting low back condition, a 2 % permanent partial disability of the body as a whole referable to his preexisting learning disability, and a 2 % permanent partial disability of the body as a whole referable to his preexisting depression. When we convert these ratings into weeks of compensation under the schedule of losses set out in § 287.190 RSMo, and combine the results together, the sum is 24 weeks compensation ( 400 weeks $\times 2 \%=8$ weeks). This amount is insufficient to meet the 50 -week threshold. It follows that employee is unable to establish Second Injury Fund liability for permanent partial disability benefits.
Given the foregoing findings and analysis, we must conclude employee failed to meet his burden of proving Second Injury Fund liability.