The appellant, Dana Blue, injured her foot when she stumbled on her employer’s stairs as she returned to work from a break. The Workers’ Compensation Commissioner awarded benefits to Blue for her injury, concluding her work subjected her to the inherently dangerous activity of traversing stairs. On judicial review, the district court rejected the Commissioner’s conclusion that stairs are inherently dangerous and reversed the award of benefits, stating Blue’s injury coincidentally occurred аt work and was not compensable. Blue has appealed this decision. Upon our consideration of the parties’ arguments, we reverse the decision of the district court and remand this case for entry of a judgment affirming the Workers’ Compensation Commissioner’s award of benefits.
I. Background Facts and Proceedings.
The facts surrounding the occurrence of Blue’s injury are largely undisputed. At the time of her injury, Blue was employed as a cocktail server by appellee, Lakeside Casinо. On December 31, 2000, she became light-headed and nauseated while on duty and was directed by her supervisor to go to the employee’s lounge until she felt better. After spending approximately forty-five minutes in the lounge, Blue’s symptoms disappeared, and she felt well enough to return to work. Blue left the lounge with several of her coworkers, walked forty feet to a set of stairs, and descended the stairs with no problem. Still conversing with her coworkers, she turned a corner and began walking down a second set of stairs. As she descended the steps, Blue stumbled and grabbed onto a coworker so as not to fall down the stairs. Although she immediately felt a pain in her ankle, Blue continued to the bottom of the staircase without incident. She later denied any light-headedness or nausea at the time of this incident.
Within the next couple of days, Blue’s ankle became painful and swollen, and she could not walk without limping. Despite treatment, Bluе continues to have pain in her ankle. She has been diagnosed with possible early complex regional pain syndrome, and her physicians have related this condition to the staircase incident.
Blue sought workers’ compensation benefits from her employer and its insurer, appellee Zurich-Ameriean Insurance
*172
Group. A deputy workers’ compensation commissioner presided over the hearing on her claim and determined Blue’s ankle prоblems arose out of and in the course of her employment at Lakeside Casino. Acknowledging there must be “a causal relationship between the employment and the injury” to satisfy the “arising out of’ requirement for compensability, the deputy relied on two Iowa Supreme Court cases that stated this requirement was satisfied if “the nature of the employment exposes the employee to risk of such an injury” or if the injury is a “rational consequence of the hаzard connected with the employment.”
See Hanson v. Reichelt,
On appeal to the Workers’ Compensation Commissioner, the Commissioner affirmed and adopted the deputy’s decision as the final agency action, supplementing that decision with some аdditional analysis. The Commissioner stated:
When injured, [Blue] was on duty and on the employer’s premises. Her employment compelled her to traverse those stairs. Accordingly, any injury she sustained as a result of traversing the stairs arose out of and in the course of her employment unless something in the evidence establishes otherwise.
The Commissioner then reviewed the evidence and concluded Blue had no health impairment that caused her to trip, and therefоre, her stumble was not idiopathic. He further observed there was no evidence of “[a] defect in the stairs or other hazardous condition that caused her to trip, beyond the hazard inherent in stairs.” The Commissioner found Blue “simply stumbled, perhaps through her own negligence by not being sufficiently careful while traversing the stairs.” Noting “traversing stairs [is] an inherently hazardous activity,” the Commissioner ruled Blue’s injury was compensable:
[T]he injury occurred from the hazard of traversing stairs and the trаuma of stumbling on those stairs while [Blue] was on the employer’s premises and performing actions necessary for her to perform in order to perform the duties of her job. Her injury is compensable.
The employer and insurer sought judicial review. The district court reversed the Commissioner’s decision, rejecting his “legal conclusion” that stairs are inherently dangerous. The court then applied the actual-risk doctrine and determined Blue’s injury did not arise out of her employment. The district court reasoned:
In this case there is no indication that the design of the stairs, condition of the stairs or the lighting of the stairs contributed to Blue’s injury. Nor is there any indication that the conditions of Blue’s employment exposed her to a hazard not generally associated with traversing stairs (for instance, she was not asked to or required to carry large, heavy, or awkward objects while traversing the stairs). Blue’s injury “coincidentally occurred while at work” аnd therefore did not arise out of work.
Blue has appealed the district court’s judicial review decision.
II. Scope of Review.
Our review is governed by Iowa Code chapter 17A.
See Wal-Mart Stores, Inc. v. Caselman,
In determining the proper standard of review, we must first identify the nature of the claimed basis for reversal of the Commissioner’s decision. Here, the employer asserted the Commissioner incorrectly held the employee’s injury arose out of her employment. This issue “presents a mixed question of law and fact.”
Meyer v. IBP, Inc.,
In the case before us, there is no dispute as to the facts. Rather, the dispute centers on the Commissioner’s application of the law to the facts. This aspect of the Commissioner’s decision-making process “can be affected by [various] grounds of error such as erroneous interpretation of law; irrational reasoning; failure to consider relevant facts; or irrational, illogical, or wholly unjustifiable application of law to the facts.” Id. (citing Iowa Code § 17A.19(10)(c), (i), (j), (m) (2001)).
Based on the arguments made in the petition for judicial review and the district court’s discussion of the issues in its decision, we conclude our review is governed by section 17A.19(10)(c), (to):
The court shall reverse, modify, or grant other appropriate relief from agency action ... if it determines that substantial rights of the person seeking judicial relief have been prejudiced because the agency action is any of the following:
[[Image here]]
с. Based upon an erroneous interpretation of a provision of law whose interpretation has not clearly been vested by a provision of law in the discretion of the agency.
[[Image here]]
to. Based upon an irrational, illogical, or wholly unjustifiable application of law to fact that has clearly been vested by a provision of law in the discretion of the agency.
Iowa Code § 17A.19(10)(e), (to) (2005). “The interpretation of workers’ compensation statutes and related case law has not been clearly vested by a provision of law in the discretion of the agency.”
Finch v. Schneider Specialized Carriers, Inc.,
III. Test For “Arising Out Of.”
A. Governing Principles. In order for an injury to be compensable in Iowa, there must be “a connection between the injury and the work.”
Meyer,
As this court has noted in prior cases, “[ijnjuries that occur in the course of employment or on the employer’s premises do not necessarily arise out of that employment.”
Miedema v. Dial Corp.,
The element of “in the course of’ refers “to the timе, place, and circumstances of the injury.”
Id.
To satisfy this requirement, the injury must take place “ ‘within the period of the employment, at a place where the employee reasonably may be, and while the employee is fulfilling work duties or engaged in doing something incidental thereto.’”
Meyer,
The element of “arising out of’ requires proof “that a causal connection exists between the conditions of [the] employment and the injury.”
Miedema,
If the nature of the employment exposes the employee to the risk of such an injury, the employee suffers an aсcidental injury arising out of and during the course of the employment. And it makes no difference that the risk was common to the general public on the day of the injury.
Applying these principles, this court has held the following injuries were not com-pensable or, in the penalty-benefits/bad-faith context, arguably not compensable, because they did not arise out of the employee’s employment: (1) a knee injury that occurred as the employee was walking across a level floor,
McIlravy,
In contrast to these decisions, we have held the following injuries did arise out of the employee’s employment: (1) death of an employee caused by a deranged co-employee,
Cedar Rapids Cmty. Sch. v. Cady,
B. Commissioner’s Interpretation of the Governing Legal Principles. With this background, we now turn to the Commissioner’s decision and his discussion of the applicable law. As noted above, the Commissioner adopted the deputy’s proposed decision, but added some additional analysis of his own. We will separately consider both bases of the Commissioner’s decision.
The deputy concluded in his proposed decision that the claimant had to establish a causal connection between her injury and a condition, risk, or hazard of her employment in order to prove her injury arose out of her employment. We find no error in this interpretation of the workers’ compensation statute. As noted above, this court adopted the actual-risk rule in Hanson, and the deputy’s statement of the law is consistent with this rule.
Although the Commissioner incorporated the deputy’s actual-risk analysis into his final dеcision, the Commissioner also appeared to interpret Iowa law to allow compensation under the positional-risk doctrine. See generally 1 Arthur Larson & Lex K. Larson, Larson’s Workers’ Compensation Law § 3.04, at 3-5 (2007) (stating under the actual-risk doctrine, the injury is compensable “as long as the employment subjected [the] claimant to the actual risk that caused the injury”); id. § 3.05, at 3-6 (stating under the positional-risk rule, “[a]n injury arises out of the employment if it would not have occurred but for the fact that the conditions and obligations of the emplоyment placed claimant in the position where he would be injured”). The Commissioner stated in his decision:
When injured, [Blue] was on duty and on the employer’s premises. Her employment compelled her to traverse those stairs. Accordingly, any injury she sustained as a result of traversing the stairs arose out of and in the course of her employment unless something in the evidence establishes otherwise.
The Commissioner seems to be applying the rule “that causal connection is sufficiently established whenever [the employment] brings claimant to the position where he or she is injured.” Id. ch. 7, *177 scope, at 7-1. Iowa has not adopted the positional-risk rule, and we decline to do so now under the circumstances presented by this case.
Larson argues in his treatise that an unexplained fall should be compensated under the positional-risk rule. Id. § 7.04[l][a], at 7-28 to 7-29. Blue argues her injury arose from an unexplained fall, and Iowa should permit compensation under the positional-risk rule. We disagree that Blue’s stumble is unexplained. The Commissioner found that Blue tripped when she lost her footing on the stairs. 6 Such an occurrence is easily explained by the process of going down stairs: one must necessarily lift one’s foot to clear the current step, carefully position one’s foot on the next step, and all the while maintain one’s balance. Blue did not do so. Thus, Blue’s stumble was readily explainable by the natural configuration of stairs and the care required to traverse them.
To the extent the Commissioner interpreted Iowa law to permit an award of benefits under the positional-risk rule, the Commissioner erred. Notwithstanding this error, we do not believe the employer’s substantial rights were prejudiced because the claimant met the “arising out of’ requirement under the actual-risk analysis incorporated in the Commissioner’s final decision. Focusing then on the actual-risk rule, we now examine whether the Commissioner’s decision was “[bjased upon an irrational, illogical, or wholly unjustifiable application of law to fact.” Iowa Code § 17A.19(10)(m).
IV. Application of Law to The Facts of This Case.
In light of the principles and case law reviewed above, we are not persuaded the Commissioner’s application of the actual-risk rule to the facts of this case was irrational, illogical, or wholly unjustifiable. Blue injured her ankle when she stumbled as she was walking down stairs. It was not disputed that these stairs were a condition existing in her workplace. Moreover, it is a matter of common knowledge that stairs pose an actual risk of stumbling or falling when traversing them, similar to the risk posed by going up and down ladders. Although Blue did not stumble due to any particular defect in or condition of the stairs, it is not necessary under Iowa case law that the stairs in Blue’s workplace be more dangerous than a typical set of steps. 7 In addition, it matters not that she stumbled through hеr own inattention. Blue’s misstep was causally related to the fact that she was walking on stairs, and therefore, the Commissioner rationally concluded her injury arose out of her employment.
This case is decidedly different from
Mcllmvy,
in which the employee injured his knee walking across a level floor,
Gilbert,
in which the employee arguably injured his neck straightening up from signing a document,
Miedema,
in which the employee injured his back turning to flush
*178
the toilet, and
Musselman,
in which the employee injured his back leaning against a wall for balance.
See McIlravy,
V. Conclusion and Disposition.
We disagreе with the district court’s conclusion that the Commissioner erred in ruling Blue’s injury arose out of her employment. Therefore, we reverse the district court’s judgment and remand this case for entry of a judgment affirming the Commissioner’s decision awarding workers’ compensation benefits to Blue under the actual-risk rule.
REVERSED AND REMANDED.
Notes
. In
Meade v. Ries,
. A claimant seeking compensation for a non-traumatic mental injury caused only by mental stimuli must prove "that the mental injury 'was caused by workplace stress of greater magnitude than the day-to-day mental stresses experienced by other workers employed in the same or similar jоbs,’ regardless of their employer.”
Dunlavey v. Econ. Fire & Cas. Co.,
(1) heavy exertions ordinarily required by the job are superimposed on a defective heart, aggravating or accelerating the previous condition; (2) unusually strenuous employment exertion is superimposed on a preexisting diseased condition; or (3) damage results from continued exertion required by the employment after the onset of the heart attack symptoms.
Wilson v. Good Will Publishers,
. As the claimant points out in her brief, this court commented in
Miedema
on the absence of any evidence that the employment in that case exposed the claimant to an
increased
hazard or risk.
Miedema,
. This case presented a bad-faith claim brought by a workers’ compensation claimant against the workers’ compensation insurer, claiming the insurer had no reasonable basis to deny his claim for workers’ compensation benefits.
McIlravy,
. This workers’ compensation case included a claim for penalty benefits.
Gilbert,
. The Commissioner found that Blue’s stumble was not idiopathic, and the employer does not challenge this finding on judicial review.
. The district court concluded the Commissioner incorrectly held a causal connection between Blue’s employment and her injury was established under the actual-risk rule. In explaining why Blue’s injury did not arise out of her employment, the court pointed out there was no "indication that the conditions of Blue’s employment exposed her to a hazard not generally associated with traversing stairs.” Although the district court purported to apply the actual-risk rule, its rationale is more consistent with the discarded increased-risk rule. This detour to increased-risk analysis may account for the district court's mistaken conclusion that the Commissioner’s application of the actual-risk rule was incorrect.
. We make this statement in reference to McIlravy and Gilbert on the basis of the factual scenario held by the court to provide a reasonable basis for the insurer’s denial of the employee's claim, not on the basis of the facts as found by the Commissioner for purposes of awarding workers’ compensation benefits.
