**Improvement**
Second, Dr. Poetz failed to persuasively rule out an intervening injurious event occurring on or about October 19, 2009. According to the August 2009 treatment records from Dr. Klinginsmith, employee was improving with chiropractic care after the claimed July 2009 work injury, to the extent that on August 17, 2009, he told Dr. Klinginsmith that he was "50% better," even after having worked that day. *Transcript*, page 317. Thereafter, employee did not seek any further chiropractic treatment for his low back until October 22, 2009, when he reported to Dr. Klinginsmith that he had low back pain at a level of an 8 or 9 out of 10. Employee told Dr. Klinginsmith that he had been doing well since the last treatment, and denied any intervening injury or activity.
On the other hand, the October 20, 2009, records from the St. Clare Health Center emergency room suggest employee had "twisted wrong yesterday while carrying some siding and has had pains since then." *Transcript*, page 254. The records further suggest the "last episode was about 3 months ago that lasted about 1 month." *Id.* It appears to us from a careful review of the St. Clare records that employee endorsed a *new* onset of low back pain as of October 19, 2009, which was distinguishable from the earlier bout of low back pain lasting about a month from mid-July to mid-August. In his testimony, employee denied that he ever carried siding, but also suggested that he told the St. Clare personnel that he had been in pain for the "past two days." *Transcript*, page 42. The records from the treating surgeon Dr. Paul Matz confirm that employee endorsed a worsening of low back symptoms in October 2009.
Given the strong indication that employee suffered (at the very least) a substantial worsening in his low back symptoms in mid-to-late October 2009, we would expect his evaluating expert to either distinguish this medical condition from that referable to the claimed work injury, or demonstrate how the October 2009 symptoms and treatment flowed from that injury. Again, though, Dr. Poetz provided only conclusory opinions that fail to acknowledge or explain the October 2009 exacerbation in employee's symptoms as memorialized in the records from Dr. Klinginsmith and St. Clare Health Center.
Third, Dr. Poetz failed to persuasively distinguish between employee's recurrent symptoms following his March 2010 slip on ice from the symptoms referable to the alleged accident. According to employee, he was doing better following surgery until this event, after which he felt as if he had returned to his pre-surgical symptomatology. Dr. Poetz opined that the slip on ice was a mere soft tissue injury, but on cross-examination, he acknowledged that even a soft tissue injury can result in the development of new pain complaints. We do not find Dr. Poetz's testimony to persuasively rule out the occurrence of a new and permanent low back injury when employee slipped on ice in March 2010.
Finally, Dr. Poetz assigned causation of a right lateral extraforaminal disc protrusion at L3-4 to the alleged July 2009 accident, but the pre-surgical MRI of October 29, 2009, did not suggest any disc protrusion then existed at L3-4, and Dr. Matz did not identify any pathology at L3-4 in either his operative report or his discharge summary. See *Transcript*, pages 250, 268-71. Instead, it appears that the L3-4 disc protrusion was first seen on the MRI study of March 9, 2010, which suggested employee then had "a right lateral extraforaminal disc protrusion" at L3-4; this mirrors the language used by Dr. Poetz in his
causation opinion. See Transcript, pages 289, 175. We note that it appears that the March 9, 2010, MRI study followed employee's slip on ice in March 2010.
In other words, Dr. Poetz assigns causation of a new, subsequent pathology with respect to the L3-4 disc to the alleged accident, where the treating orthopedic surgeon did not diagnose this pathology or address it in the surgery he performed. As above, Dr. Poetz fails to provide any explanation whatsoever for this aspect of his opinions. We find that this circumstance weakens the persuasive value of all of Dr. Poetz's testimony and opinions in this case.
For all of the foregoing reasons, we are not persuaded by the testimony from Dr. Poetz to render a finding that the alleged accident of July 17, 2009, was the prevailing factor causing any resulting medical condition or disability. We find, rather, that the alleged accident on that date was not the prevailing factor causing any identifiable medical condition or disability. Because employee has failed to meet his burden of proof with respect to the dispositive issue of medical causation, we must deny the claim.
All other issues are moot.