OPINION
FABE, Justice.
I. INTRODUCTION
Robert Steffey suffered two work-related injuries in 1992 and received chiropractic care regularly until 1995, at which point his employer controverted his claims. Steffey filed numerous reports of injury complaining that work had aggravated his condition. Because the employer presented substantial evidence that work did not aggravate Steffey's symptoms, we affirm the Board's decision denying Steffey benefits.
II. FACTS AND PROCEEDINGS
The Municipality of Anchorage has employed Robert Steffey as a Refuse Disposal Utility III worker since 1988. The job requires him to drive a garbage truck and trailer between the refuse transfer station in South Anchorage and the Eagle River landfill.
Steffey suffered a work-related injury on February 20, 1992, damaging his right shoulder and lower back while wrenching some garbage free from his truck's trailer. Steffey missed two months of work. Upon his return he complained that sitting in his truck seat aggravated his injury because it offered him no lumbar support. Soon after he returned to work, Steffey suffered a second work-related injury on June 6, 1992 and again stopped working. He returned to work in October 1992, and the Municipality installed a new seat in his truck. Nevertheless, Steffey continued to complain that driving aggravated his injury.
Steffey sought palliative chiropractic care from Dr. James Martin, who treated Steffey for four and one-half years. The Municipality paid for all of Steffey's chiropractic care until April 1995. The Municipality's obligation to pay for Steffey's chiropractic care is governed by the following regulation:
Steffey sought continued chiropractic treatment for the aggravation of his old injury at an Alaska Workers' Compensation Board hearing in May 1995. He wanted to receive the care without having to file either a plan for continuing and multiple treatments as required by AS 23.30.095
After the Board's decision, Steffey began filing numerous Reports of Occupational Injury. He filed eight reports in eight months for injuries dating back to March 1994. Specifically, Steffey reported two injuries that roughly correspond with the days of his chiropractor visits in the spring of 1995. Late that summer he reported additional injuries that occurred on August 1, 1995 and August 22, 1995. In February 1996 Steffey reported four more injuries that all dated back to 1994.
After filing the four injury claims during the summer of 1995, Steffey continued to work until September 6, when his chiropractor recommended that he stop working. He did not return to work until November, missing two and one-half months. During Steffey's work hiatus, he received treatment from Dr. Martin and, at the Municipality's request, was examined by Dr. Bryan Laycoe, a certified orthopedic surgeon, and Dr. Scott Fechtel, a chiropractor and resident in medical neurology. Dr. Fechtel had examined Steffey in October of 1992 in conjunction with his original work-related injuries. Dr. Laycoe and Dr. Fechtel concluded that Steffey's recent complaints did not arise from new work-related aggravation of his injuries. The report from Dr. Morris Horning's exam of Steffey, performed a year earlier, also reached this conclusion. Based on these results, the Municipality controverted Steffey's claim for benefits for the August 22, 1995 alleged injury.
Steffey has claimed a work-related aggravation of his 1992 injuries and attributes an increase in symptoms to the seat of the truck that his job required him to drive. All of the injury reports filed after the May 1995 hearing cite his truck and its seat as the cause of his injuries. Steffey repeatedly demanded new equipment, and the Municipality eventually complied with his request in October 1995 and issued him a new truck with an air-cushioned adjustable seat. Since he has received the new truck, Steffey claims that he has not sought further chiropractic care for lower back pain.
In the fall of 1996, the Board held a hearing on the issue of whether Steffey suffered a compensable injury on any or all of the eight occasions for which he filed a report. The
The Board relied heavily on the reports and testimony of Dr. Laycoe and Dr. Fechtel. The Board found that objective medical evidence substantiated the doctors' conclusions that Steffey had not suffered new work-related injuries, that further chiropractic care should be curbed, and that Steffey's condition was stable.
In reaching those conclusions, the Board discounted the value of Dr. Martin's testimony. Dr. Martin testified that Steffey had suffered a series of new injuries which had aggravated and worsened his pre-existing condition. The Board remarked in its findings, however, that with only one exception—the August 22, 1995 alleged injury—Dr. Martin's records continued to list the date of Steffey's injury as 1992. The Board emphasized the failure of Steffey's own treating chiropractor to record any "new" injuries that may have combined with Steffey's preexisting infirmity to bring about an aggravation.
In concluding that Steffey had not suffered a new injury on August 22, 1995, the Board found Steffey's conduct to be inconsistent with that of someone who would subsequently miss two and one-half months of work. The Board heard substantial testimony that Steffey was an avid golfer. Dr. Laycoe testified that golfing puts a great deal of strain on the lower back, and Steffey conceded to Dr. Horning that golf increased his pain. Steffey later testified at the hearing:
After learning that Steffey played thirteen holes of golf within a week of the August 22 injury, the Board doubted the veracity of Steffey's claims. The Board also noted that Steffey waited a week after the injury before seeking treatment from Dr. Martin and that Steffey continued to work for two and one-half weeks after his job ostensibly aggravated the injury.
Accordingly, the Board found that Steffey had not suffered a compensable injury in 1994 or 1995. The Board concluded that Steffey's treatment for his February 20, 1992 and June 6, 1992 injuries should be governed by the standards prescribed by 8 AAC 45.082(f). Because the parties did not address whether the Municipality had paid for chiropractic care pursuant to those standards, the Board retained jurisdiction to determine how much the Municipality should pay.
Steffey appealed to the superior court. Judge Sigurd E. Murphy affirmed the Board's decision, which Steffey now appeals.
III. STANDARD OF REVIEW
Because the question of whether Steffey suffered a work-related injury in 1994 or 1995 is a question of fact,
The question of whether the Board applied the correct legal standard is a question of law to which this court applies its independent judgment.
IV. DISCUSSION
Steffey claims that on eight separate occasions he has suffered work-related aggravations of his 1992 injury. The Board was required to decide whether Steffey's employment was a substantial factor in the aggravation of his injuries.
In deciding whether work-related factors were a substantial factor in causing an employee's injury, the Board applies the Workers' Compensation Act presumption that an employee's claim is compensable.
A. The Municipality Presented Substantial Evidence Sufficient to Rebut the Presumption.
Because the Municipality does not dispute that Steffey triggered the presumption of compensability through Steffey's own testimony and the testimony of Dr. Martin, we begin our analysis by examining whether the Municipality produced substantial evidence that Steffey did not suffer a work-related aggravation of his injury. In order to overcome the presumption of compensability
Substantial evidence is "such relevant evidence as a reasonable mind might accept as adequate to support a conclusion."
We conclude that the Municipality presented substantial evidence that work was not a substantial factor in aggravating Steffey's disability. The Board accorded "great weight to Dr[ ]. Laycoe and Dr. Fechtel's opinion[s]." Both doctors examined Steffey in October 1995, and both testified at Steffey's hearing. Dr. Laycoe stated that, "[Dr. Fechtel and I] did not believe that there was a specific work injury in August of 1995." Instead, Dr. Laycoe offered an alternative, non-work-related explanation for Steffey's August 22, 1995 symptoms:
Dr. Laycoe's alternative explanation for the cause of Steffey's injury was substantiated in part by Steffey's own hearing testimony and his admissions to Dr. Horning. Because the Board had heard evidence that work was not a substantial factor in causing Steffey's symptoms, the Board did not err in concluding that the Municipality had rebutted the presumption of compensability. "It has always been possible to rebut the presumption of compensability by presenting a qualified expert who testifies that, in his or her opinion, the claimant's work was probably not a substantial cause of her disability."
Steffey argues that our recent decision in Tolbert requires us to conclude that the Board erred in finding that the Municipality overcame the presumption. In Tolbert we concluded that the employer failed to rebut the presumption because the expert testimony did not rule out another expert's diagnosis of an alternative cause of the disability.
B. Steffey Did Not Prove His Claim by a Preponderance of the Evidence.
We must next examine the Board's conclusion that Steffey failed to prove that his work was a substantial factor in the aggravation of his injuries. In making this determination, the Board may weigh the evidence presented by both sides.
In concluding that Steffey failed to prove his claim, the Board found that Steffey did not present credible evidence. Steffey presented his own testimony and the testimony of Dr. Martin, his treating chiropractor. The Board discounted the testimony of Dr. Martin and placed more weight upon his written medical records. In his records from June 1992 through August 1, 1995, Dr. Martin listed 1992 as the date of Steffey's injury. The Board reasoned that if Steffey had reported significant injuries after that date, Dr. Martin would have noted it, as he did on August 22, 1995. Because we defer to the Board's determination of witness credibility, we give little weight to Dr. Martin's testimony.
Dr. Martin's reports did indicate that Steffey suffered a new injury on August 22, 1995. Accordingly, the Board gave particular scrutiny to Steffey's claim that he suffered a work-related injury during that week in August 1995. In doing so, the Board relied heavily on the report of Drs. Laycoe and Fechtel, which concluded that the August 22, 1995 alleged injury did not aggravate the 1992 injury.
The Board was skeptical of the veracity of Steffey's claims. The Board found that Steffey's attempt to play golf within a week of the alleged injury, his failure to see Dr. Martin for a week thereafter, and his ability to continue working for two and one-half weeks after August 22 were inconsistent with an aggravation of the significance claimed by Steffey. The Board agreed with the conclusion of Drs. Laycoe and Fechtel and denied Steffey benefits.
We affirm the Board's decision under the deferential substantial evidence standard. Although Steffey points to testimony by Drs. Laycoe and Fechtel indicating that the doctors were not absolutely certain that work was not a substantial factor in Steffey's injury, it is not our role to reweigh the evidence.
V. CONCLUSION
Because we conclude that substantial evidence supported the Board's finding that Steffey's condition was not work related, we AFFIRM the Board's decision to deny Steffey workers' compensation benefits.
MATTHEWS, Chief Justice, not participating.
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