We find, as a factual matter, that the employee has sustained greater permanent partial disability than resulted from the primary injury alone due to synergistic interaction between disability to her lumbar spine and cervical spine in combination with her preexisting right knee disability. In so finding, we rely on Dr. Volarich's expert medical opinion on the issue of "synergy". We also rely on the employee's credible testimony regarding increased difficulties related to her multiple disabilities, largely due to her altered gait.
Dr. Volarich makes the case for a synergistic relationship between the employee's disabilities across the board. Although Dr. Volarich's credible testimony convinces us there is more likely than not some degree of synergy associated with the employee's right shoulder disability attributable to the primary injury and her preexisting bilateral carpal tunnel syndrome, we find insufficient evidence to enable us to quantify the degree of synergy attributable to these conditions.
As we have found, the employee had no preexisting permanent partial disability relating to her central nervous system that constituted a hindrance or obstacle to employment or reemployment.
13 We note the absence of any medical opinions regarding the employee's preexisting disability other than that of Dr. Volarich.
Injury No.: 08-025433
Employee: Enrika Fox
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We calculate the Second Injury Fund's liability for permanent partial disability attributable to synergistic interaction between disability relating to the employee's lumbar and cervical spine attributable to the employee's primary injury and the employee's preexisting right knee disability based on a loading factor of 10%.
Law
Section 287.220 RSMo creates the Second Injury Fund. Section 287.220.2 applies to injuries occurring prior to January 1, 2014, and provides when and what compensation will be paid by the Fund in "all cases of permanent disability where there has been previous disability." *Id.* This section provides, in pertinent 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, ... 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 the 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, hereinafter provided for (emphasis added).
Missouri courts have established 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
Injury No.: 08-025433
Employee: Enrika Fox
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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).
To find liability of the Second Injury Fund for permanent partial disability benefits,
[T]he claimant must establish that the present compensable injury and his preexisting permanent partial disability combined to cause a greater degree of disability than the simple sum of the disabilities viewed independently. This is referred to as the "synergistic effect." If a claimant establishes that the two disabilities combined result in a greater disability than that which would have occurred from the last injury alone, then the Fund is liable for the degree of the combined disability that exceeds the numerical sum of the preexisting disabilities and the disability from the last injury, or the "synergistic effect" of the combined disabilities. In other words, the Fund is liable only for the amount attributable to the synergistic combination. Thus, the failure to prove a synergistic combination between the primary injury and a preexisting disability is proper grounds for denying Fund liability.
Winingear v. Treasurer of State, 474 S.W.3d 203, 207-08 (Mo. App. 2015). See also Pierson v. Treasurer of Mo. As Custodian of the Second Injury Fund, 126 S.W.3d 386 (Mo. 2004) and Calvert v. Treasurer of State, 417 S.W. 3d 299 (Mo. App. 2013).
In order to prove a claim for permanent partial disability against the Second Injury Fund, an employee must demonstrate that her preexisting disability combines with a subsequent compensable injury "so that the degree or percentage of disability caused by the combined disabilities is substantially greater than that which would have resulted from the last injury considered alone and of itself (emphasis added)."14
Simply put, the fund is liable only for the degree of the combined disability that exceeds the numerical sum of the pre-existing disabilities and the disability from the last injury. This excess for which the fund is liable is referred to as the synergistic effect of the combined disabilities (emphasis added).
Treasurer of Missouri-Custodian of Second Injury Fund v. Witte, 414 S.W.3d 455,467. (Mo. 2015).
In Witte, the Supreme Court held that 287.220.1 imposes no numerical threshold for permanent partial disability from the employee's last injury. Id. at 467.
Witte further instructs that, for purposes of triggering Fund liability based on preexisting disability, 287.220.1 does not allow combination of a major extremity disability with a
14 Section 287.220.2 RSMo.
Injury No.: 08-025433
Employee: Enrika Fox
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body as a whole disability but instead "expresses the minimum thresholds only in terms of a singular injury to either the body as a whole or a major extremity". *Id.* 465.
However, once the threshold of either fifty weeks of compensation for a body as a whole injury or fifteen percent permanent partial disability of a major extremity is met, pursuant to the statute's plain and ordinary meaning "all preexisting injuries, without the threshold limitation, are to be considered" in the calculation of Fund liability. *Id.* 467.
**Conclusions of Law**
As we have found, permanent partial disability in the amount of 17% of the body as a whole related to the cervical and lumbar spine, attributable to the employee's March 31, 2008, work injury, combined synergistically with preexisting disability consisting of 20% of the employee's right lower extremity rated at the 160-week level, to result in disability that exceeds the numerical sum of the total disabilities.
The employee's preexisting disability of 20% of her right lower extremity meets the 15% permanent partial disability of a major extremity numerical required to trigger Second Injury Fund liability, for permanent partial disability pursuant to 287.220.
The Second Injury Fund argues that the employee had no preexisting right knee disability because the employee acknowledged that prior to her 2008 injury she worked full duty and that her right knee condition, despite flare-ups, was not constantly an issue. The Second Injury Fund's counsel reasons that, based on the foregoing testimony, the employee's right knee disability did not constitute a "hindrance or obstacle to employment", as required by 287.220. Pursuant to the test established in *Kinsley, supra*, the employee's testimony minimizing the effect of her knee condition prior to her 2008 injury does not preclude our finding that this condition constituted a hindrance or obstacle to employment. We find Second Injury Fund's argument on this point unpersuasive.
Based on the employee's credible testimony and Dr. Volarich's expert opinion, we have found the employee met her burden of establishing a synergistic effect between permanent partial disability resultant from her primary injury to the cervical and lumbar spine and preexisting permanent partial disability to the right knee.
Missouri courts have held that the testimony of a claimant or other lay witness "can constitute substantial evidence of the nature, cause, and extent of the disability when the facts fall within the realm of lay understanding." *Goleman v. MCI Transporters*, 844 S.W. 2d 463, 466 (Mo. App. 1993) (overruled on other grounds, *Hampton v. Big Boy Steel Erection*, 121 S.W.3d 220 (Mo. 2003); citing *Griggs v. A. B. Chance Co.*, 503 S.W. 2d 697 at 704 (Mo. App. 1973).
As a factual matter, we have quantified the Second Injury Fund's liability for permanent partial disability attributable to the synergistic interaction between disability to the employee's lumbar and cervical spine resultant from the primary injury and preexisting disability to her right knee based on a loading factor of 10%.