¶ 2. Claimant was employed by Mack Molding in 1998 when he injured his back in a lifting incident, suffering a herniated disc in his spine, an injured facet joint, and strained lower lumbar muscles. In 1999, as a result of the injury, claimant had surgery on his spine, which removed part of the facet joint and large amounts of disc material. After the surgery, claimant continued to experience pain, worked part-time for a while, and was gradually released by his doctor to work full-time, but with lifting restrictions. In May 2000, while his workers’ compensation claim against Mack Molding was still under adjustment, claimant began work at Pike Industries, a New Hampshire employer. In November 2000, Mack Molding sent claimant to an orthopedic surgeon, who determined that claimant had reached a medical end result for the 1998 injury, with persistent back and leg pain and a permanent disability amounting to a ten-percent impairment of the whole person.
¶ 3. Eight months later, on July 31, 2001, after lifting a pipe at Pike Industries, claimant experienced back pain and leg numbness and sought medical treatment. Claimant missed some time from work, engaged in physical therapy, and returned to full-time work by September or October of 2001. Claimant was laid off from Pike
¶ 4. Claimant next filed for workers’ compensation in Vermont against Mack Molding. Mack Molding denied coverage, contending that it was not answerable for the pipe-lifting episode at Pike, since it was not a recurrence of the Mack Molding injury, but an aggravation of that injury while in Pike’s employ. At the time of the hearing in 2004, claimant had not resumed employment. After a contested hearing, the Commissioner concluded that the back pain and numbness incurred in July 2001 at Pike was a “flareup” for which Mack Molding was not
responsible. The Commissioner determined the flare-up prompted claimant to seek
medical treatment,
but did not alter claimant’s underlying condition remaining from his earlier accident at Mack Molding. The Commissioner further determined, however, that once claimant’s condition returned to his pre-Pikeinjury “baseline” in late September or October 2001, Mack Molding continued to be liable for benefits due on account of claimant’s underlying condition. See
Pacher v. Fairdale Farms,
¶ 5. The Commissioner based his conclusion on opinions from three medical experts, including one hired by Mack Molding, that the Pike incident changed nothing in claimant’s underlying condition from his earlier injury at Mack Molding. Two of the experts related the need for fusion surgery to the earlier Mack Molding injury. Two of the experts opined that claimant returned to his prePike-injury baseline four months before the 2002 surgery. That claimant’s condition never stabilized after the earlier injury was further supported by medical indications that he still had pain and could work only with lifting restrictions. Notwithstanding an opinion to the contrary from a fourth medical expert, whose opinion was not supported by the MRI, the Commissioner’s conclusion was amply supported by the medical evidence.
¶ 6. Our review in a direct appeal from a decision by the Commissioner of Labor and Industry is limited to questions of law certified by the Commissioner. 21 V.S.A. § 672. We are bound by the Commissioner’s findings so long as they are supported by the evidence.
Wroten v. Lamphere,
¶ 7. The question certified by the Commissioner was whether “a lifting incident at Pike Industries in 2001 or an injury at Mack Molding in 1998 [was] responsible for claimant’s current condition, his January 2002 surgery and lost time from work.” Mack Molding argues that application of the traditional aggravation-or-recurrence analysis would conclusively result
¶ 8. We have stated that where a dispute concerns a compensation claim involving successive employers and successive injuries, liability will remain with the first employer if the second injury is a recurrence of the first.
Farris v. Byrant Grinder Corp.,
¶ 9. The Commissioner’s melding of a distinctly new injury and condition, as discussed in
Pacher,
with a flare-up may lend more confusion than clarity to the issue.
Pacher
acknowledged that just because a claimant incurs a subsequent injury does not mandate a finding that the injury is either a recurrence or an aggravation; alternatively, a subsequent incident may be an entirely new injury. See
Pacher,
¶ 10. The temporary flare-up doctrine, like the aggravation-or-recurrence analysis, rationally serves the Commissioner’s obligation to determine, if possible, the relative liability of multiple employers for different and distinct injuries to a worker. See
Pacher,
¶ 11. The Commissioner’s expression of the analysis may be inexact, but we find no error in its application here. Nor do we find unsupported the Commissioner’s ultimate conclusion that Mack Molding was not responsible for lost work or medical treatment associated with the 2001 back strain suffered at Pike, but was responsible for claimant’s underlying condition incurred at Mack Molding, which continued, unchanged and unstable, before and after the Pike incident. Although the Commissioner’s findings do not indicate that the fusion surgery was specifically prescribed prior to the Pike incident, the opinions of three medical experts support the conclusion that it was the same underlying condition that claimant had prior to the Pike incident that led to the need for the spinal fusion, not the temporary back strain claimant experienced from the Pike injury-
¶ 12. Mack Molding argues that other facts in the record favor a finding of aggravation, but it is not our role to weigh the evidence in the record. Mack Molding was free to seek a new trial on the facts in the superior court and declined to do so. As we previously observed in
Kenney v. Rockingham School District,
in denying the employer’s motion for reargument, “[i]f the weight of the evidence seems to a defendant to preponderate in his favor, and the commissioner has decided against him, the defendant’s remedy is by appeal to county court pursuant to 21 V.S.A. § 670.”
¶ 13. Finally, Mack Molding argues that we should abandon aggravation-orrecurrenee analysis in Vermont, together with its flare-up cousin, in favor of the last-injurious-exposure rule to limit liability of a previous employer when a former employee is reinjured while working for a later employer. Mack Molding argues that the aggravation and recurrence standards yield inconsistent, unpredictable, and unfair results, citing more than thirty decisions by the Commissioner with divergent results that are not subject to review in this appeal. Mack Molding contends that the last-injurious-exposure rule is warranted in cases involving complex issues of causation and multiple employers.
¶ 14. As an initial matter, it does not appear from the record provided that Mack Molding requested that the Commissioner apply the last-injurious-exposure rule in this case. Instead, Mack Molding submitted proposed findings of fact and conclusions of law urging a finding of aggravation. We need not address the propriety of Mack Molding’s request that this Court adopt a determinative rule of law where it declined to give the Commissioner the opportunity to consider the matter in
¶ 15. We have previously recognized that the last-injurious-exposure rule may be appropriate
“only
whei'e separate injuries all causally contribute to the total disability so that it becomes difficult or impossible to allocate liability among several potentially liable employers.”
Pacher,
¶ 16. To the extent that Mack Molding wants to remove the element of causation in determining multiple employer liability — in the interest of avoiding litigation in cases involving complex and conflicting medical evidence — these are public policy concerns best brought to the attention of the Legislature, or possibly to the regulatory authority of the Commissioner.
¶ 17. For the foregoing reasons, we affirm the Commissioner’s decision ordering Mack Molding to adjust the claim for benefits.
Affirmed.
