Section 287.220 RSMo creates the Second Injury Fund and provides when and what compensation shall be paid in "all cases of permanent disability where there has been previous disability." As a preliminary matter, the employee must show that she suffers from "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 ..." *Id.* The Missouri courts have articulated the following test for determining whether a preexisting disability constitutes a "hindrance or obstacle to employment:
> [T]he proper focus of the inquiry is not on the extent to which the condition has caused difficulty in the past; it is on the potential that the condition may combine with a work-related injury in the future so as to cause a greater degree of disability than would have resulted in the absence of the condition.
*Knisley v. Charleswood Corp.*, 211 S.W.3d 629, 637 (Mo. App. 2007) (citation omitted).
We are convinced that employee's preexisting disabilities were serious enough to constitute hindrances or obstacles to employment for purposes of § 287.220 RSMo. We have adopted the administrative law judge's findings that employee suffered preexisting disability of 15 % of the body as a whole referable to her lumbar spine, 12.5 % referable to her cervical spine, and 20 % referable to her coronary artery disease. In addition, we have found employee suffered preexisting disability of 12.5 % of the body as a whole referable to obesity, and credited Dr. Koprivica's opinion that this condition constituted a hindrance or obstacle to employment. Accordingly, we conclude that at the time she sustained the primary injuries in this matter, employee suffered from preexisting permanent partial disabilities referable to her cervical spine, coronary artery disease, and obesity, and that each of these conditions constituted hindrances or obstacles to her employment or reemployment.
We now proceed to the question whether employee met her burden of establishing entitlement to compensation from the Second Injury Fund. Section 287.220.1 RSMo provides, in relevant part, as follows:
If the previous disability or disabilities, whether from compensable injury or otherwise, and the last injury together result in total and permanent disability, $\ldots$ the employer at the time of the last injury shall be liable only for the disability resulting from the last injury considered alone and of itself; except that if the compensation for which the employer at the time of the last injury is liable is less than the compensation provided in this chapter for permanent total disability, then in addition to the compensation for which the employer is liable and after the completion of payment of the compensation by the employer, the employee shall be paid the remainder of the compensation that would be due for permanent total disability under section 287.200 out of a special fund known as the "Second Injury Fund" ...
The foregoing section requires us to first determine the compensation liability of the employer for the last injury, considered alone. If employee is permanently and totally disabled due to the last injury considered in isolation, the employer, and not the Second Injury Fund, is responsible for the entire amount of compensation. See ABB Power T \& D Co. v. Kempker, 236 S.W.3d 43, 50 (Mo. App. 2007). We have found that, as a result of the last injury, employee sustained a 25 % permanent partial disability of the body as a whole. Dr. Koprivica and Ms. Titterington agreed that employee is permanently and totally disabled as a result of the permanent disability resulting from her work injuries in combination with employee's preexisting conditions of ill, and we have found these experts credible. We conclude that employee did not sustain enhanced permanent partial disability, but rather that employee is permanently and totally disabled due to a combination of her preexisting disabilities in combination with the effects of the primary injuries.
In sum, we are persuaded that employee has met her burden of establishing Second Injury Fund liability for permanent total disability under § 287.220.1. The Second Injury Fund is liable for permanent total disability benefits.