The parties stipulated to the fact that on May 22, 2007, employee sustained an injury by accident while employed by employer.
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[^0]: ${ }^{1}$ All statutory references are to the Revised Statutes of Missouri (2006) unless otherwise indicated.
On March 30, 2007, two months prior to the work injury, employee had a routine physical exam with his physician, Dr. Byam. Dr. Byam's notes state that on that date employee felt well with no complaints, he exhibited no symptoms of neck pain, and he had full range of motion of his head and neck.
Employee testified that after his May 22, 2007, accident he initially was going to "tough it out" but after three months he sought medical treatment because the pain had gotten so bad. Employee first sought treatment with Dr. Byam for his injury on August 31, 2007. According to Dr. Byam's notes, employee presented with complaints of numbness in his upper left and right extremities, hands, and fingers as well as occasional dizziness. Employee also presented with back pain, decreased range of motion, joint pain, muscle pain, muscle spasm, and neck pain. Accordingly, Dr. Byam ordered x-rays and MRI of the cervical and thoracic spine.
The MRIs were completed on September 10, 2007. The reading radiologist, Dr. Bonnie Smith, found that there are compression deformities at C5 and C6 with loss of vertebral height. Dr. Smith found that an "[a]bnormal signal within the C6 vertebral body suggests that this may be a recent injury. Additional abnormal signal within the superior end plate of C7 also suggests microtrabecular injury."
Dr. Byam then referred employee to Dr. Rodgers. On September 18, 2007, Dr. Rodgers notes show that employee has a three month history of pain in his neck radiating down his right arm with some numbness and tingling. Dr. Rodgers notes that the MRI read as showing compression fractures, although he opined that instead it showed degenerative changes. Dr. Rodgers also noted that employee had pressure on his spinal cord. On November 7, 2007, Dr. Rodgers performed a surgery to fuse C5-7.
Employee testified that the surgery helped initially, but the pain has since returned. Dr. Rodger's notes from February 7, 2008, show that employee stated his neck pain had resolved. On July 29, 2008, Dr. Rodger's notes show that employee complained of a trigger point in his neck. On November 7, 2008, Dr. Rodger's notes show that employee was continuing to experience pain in his neck.
On April 21, 2011, Dr. Reinsel evaluated employee and issued a report at the request of employer. Dr. Reinsel stated that employee complains of pain and his cervical fusion never successfully healed. In response to a question regarding whether the May 2007 work injury was the prevailing factor in employee's medical condition and disability, Dr. Reinsel stated "No. There is insufficient evidence pointing to any possible work injury. Clearly the patient did have lower back problems prior to May 2007 document [sic] by the primary care physician's notes from January. No specific injury or event his [sic] described by his family physician, nor is any injury described by his surgeon, Dr. Rodgers." He also stated that "the need for any additional treatment is not related to any possible work injury." Finally, Dr. Reinsel stated he would give a 0\% disability rating "simply because it's not clear that there was any particular injury as described."
On July 13, 2011, Dr. Meyers evaluated employee and issued a report at the request of employee. Dr. Meyers stated that employee continues to have significant symptoms