**Enployee: Ricky Fielder**
Correspondence from employee's treating doctors suggests employee reached maximum medical improvement in July 2005. Dr. Randolph determined that employee was at maximum medical improvement on July 12, 2005, in his correspondence dated that day. After that date, employee underwent an MRI, a nerve conduction study/EMG, and two CT scans. Dr. Coyle, in a letter dated November 9, 2005, opined that he would agree with Dr. Randolph that employee was at maximum medical improvement, pending a review of the CT scan results. Dr. Coyle reviewed those results and, in a letter dated December 16, 2005, opined that he was in agreement with Dr. Randolph that employee was at maximum medical improvement.
We find Dr. Coyle's and Dr. Randolph's findings persuasive on this issue. We find that employee reached maximum medical improvement in relation to the primary injury on July 12, 2005. We turn now to the question of the nature and extent of disability resulting from the primary injury. The employer's liability for the primary injury must be determined before we consider whether employee is entitled to compensation from the Second Injury Fund. *Landman v. Ice Cream Specialties, Inc.*, 107 S.W.3d 240, 248 (Mo. 2003) overruled on other grounds by *Hampton v. Big Boy Steel Erection*, 121 S.W.3d 220, 224 (Mo. banc 2003).[^1] "[P]re-existing disabilities are irrelevant until the employer's liability for the last injury is determined." *Id.* (citation omitted).
Following the October 8, 2004, work injury, Dr. Houchin diagnosed cervical, thoracic, and lumbar spasm with lumbar radiculopathy and MRI findings consistent with severe spinal stenosis. Dr. Houchin's course of treatment included a Toradol injection and Percocet (employee also had a prescription for Vicodin in connection with a preexisting chronic back pain condition). Dr. Houchin took employee off work and recommended physical therapy. Dr. Houchin acknowledged that there was not a significant change in pathology demonstrable on findings from an MRI taken in August 2005 compared to an MRI taken in June 1997. Dr. Houchin opined, however, that the October 8, 2004, work injury caused a significant change in employee's back condition; we find Dr. Houchin credible in this regard. Dr. Houchin explained that he treated employee from 1988 to present for pain related to a 1983 back surgery, and each time, employee responded in a reasonable amount of time to therapy. Dr. Houchin explained that, during this long-term course of treatment for intermittent back complaints, there was never a time that employee had a loss of functional ability to the degree seen after the 2004 work injury. Dr. Houchin recommended further medical treatment and did not indicate that employee was at maximum medical improvement or issue permanent partial disability ratings specific to the 2004 work injury.
Dr. Volarich provided an independent medical evaluation on behalf of the employee. With regard to the October 8, 2004, work injury, Dr. Volarich diagnosed aggravation of employee's lumbar syndrome due to neuroforaminal narrowing at the L5-S1 level, with mild disc bulging causing recurrent L5 radiculopathy and worsening of lumbar radicular symptoms. Dr. Volarich opined that employee was at maximum medical improvement.
[^1]: *Landman* is one of many cases that were partially overruled by *Hampton v. Big Boy Steel Erection*, 121 S.W.3d 220 (Mo. banc 2003). We cite other cases herein that were partially overruled by *Hampton*; because these cases are cited for principles that were not overruled, we make no further mention of *Hampton's* effect.
and assigned a 20\% permanent partial disability of the body as a whole referable to the lumbo-sacral spine due to the aforementioned progression and aggravation of employee's lumbar syndrome. Dr. Volarich explained that his rating accounts for worsening of employee's back pain syndrome as well as loss of motion and lower extremity radicular symptoms.
We find Dr. Volarich's diagnosis credible. We also find Dr. Volarich credible to the extent that we agree that employee sustained permanent partial disability referable to the primary injury. We find his rating, however, somewhat excessive. We find that employee suffered a 15\% permanent partial disability of the body as a whole referable to the lumbo-sacral spine due to the primary injury.