Employee alleges his bilateral carpal tunnel syndrome is an occupational disease which he incurred while working for employer. Employee further alleges that his carpal tunnel syndrome combines with his preexisting disabilities to render him permanently and totally disabled. Employee seeks permanent partial disability benefits against employer for his carpal tunnel syndrome and permanent total disability benefits against the Second Injury Fund.
Before determining Second Injury Fund liability, an employee "must establish that he or she sustained a compensable [primary] injury and that the injury caused the requisite level of permanent partial disability." Nance v. Treasurer of Missouri, 85 S.W.3d 767, 771 (Mo. App. 2002).
In this case, employee alleges that his primary injury is the occupational disease of carpal tunnel syndrome. Section 287.067.1 RSMo defines occupational disease as:
an identifiable disease arising with or without human fault out of and in the course of the employment. Ordinary diseases of life to which the general public is exposed outside of the employment shall not be compensable, except where the diseases follow as an incident of an occupational disease as defined in this section. The disease need not to have been foreseen or expected but after its contraction it must appear to have had its origin in a risk connected with the employment and to have flowed from that source as a rational consequence.
Section 287.067.2 RSMo goes on to provide that "[a]n occupational disease is compensable if it is clearly work related and meets the requirements of an injury which is compensable...." Therefore, an employee must present substantial and competent evidence that he or she has contracted an occupationally induced disease rather than an ordinary disease of life.
The Courts have stated that the determinative inquiry with regard to occupational diseases involves two considerations: "(1) whether there was an exposure to the disease which was greater than or different from that which affects the public generally, and (2) whether there was a recognizable link between the disease and some distinctive feature of the employee's job which is common to all jobs of that sort." Hayes v. Hudson Foods, Inc., 818 S.W.2d 296, 300 (Mo. App. 1991) (citations omitted).
In this case, we find that employee has failed to satisfy his burden that his carpal tunnel syndrome was caused by his work activities with employer.
First of all, there are numerous inconsistencies related to employee's alleged onset date of his carpal tunnel syndrome. Employee last worked for employer on July 5, 2001. Claimant filed a claim for benefits more than two years later alleging his carpal tunnel syndrome was caused by his employment with employer and that the onset date was May 1, 2003. Claimant later filed an amended claim alleging that the onset date was actually July 5, 2001, his last day of work. Employee then testified that he began experiencing symptoms three years before he left his employment with employer (approximately July 1998).
Dr. Fagan noted that employee's symptoms began two weeks before June 30, 2003 (June 16, 2003). Dr. Mackinnon noted an onset date of sometime in 2000. Dr. Van Ryn testified that employee denied any prior problems with his hands before approximately 1999. Dr. Van Ryn also noted in his report that a March 9, 2004, report from Dr. Barry Feinberg indicates an onset date of May 2003.
While the onset date inconsistencies alone may be enough to find that employee is not credible and has failed to satisfy his burden of proving his carpal tunnel syndrome is work-related, we also find that the record lacks the requisite medical evidence linking employee's conditions of employment to his carpal tunnel syndrome.
Although employee testified that he had symptoms of carpal tunnel syndrome up to three years before last working for employer in July 2001, he never went to a physician regarding these problems, he never told the doctors or nurses at employer's clinic about these problems, and he had no diagnosis of carpal tunnel syndrome prior to seeing Dr. Fagan on June 30, 2003. In addition, when Dr. Fagan did diagnose employee's carpal tunnel syndrome, he noted that the symptoms of numbness and tingling started just two weeks before June 30, 2003. There was no mention at all of any history of work-relatedness during this visit.
The preliminary diagnosis of carpal tunnel syndrome was then confirmed by nerve conduction studies performed on July 14, 2003. None of the records related to these nerve conduction studies discuss his carpal tunnel syndrome being related to his work with employer.
Employee then followed-up with Dr. Mackinnon who performed carpal tunnel release surgeries on both his right and left wrists in 2005 and 2006, respectively. None of Dr. Mackinnon's records discuss his carpal tunnel syndrome being related to his work with employer.
The first reference to employee's carpal tunnel syndrome being work-related is his formal Claim for Compensation filed in August 2003. The only medical opinion of causation between employee's work activities and his bilateral carpal tunnel syndrome is in Dr. Van Ryn's independent medical evaluation report. Dr. Van Ryn saw employee on one occasion, June 10, 2010, nine years after he ceased working for employer. Dr. Van Ryn reviewed employee's voluminous medical records dating back to 1996, but did not note any workrelated medical history prior to the filing of employee's formal claim.
Dr. Van Ryn appears to have heavily relied on employee's subjective history, given nine years after he left his employment, that his hand pain "probably" started in about 1999. Dr. Van Ryn took this history, characterized his paint spraying for employer as a "repetitive motion activity", and ultimately concluded that employee's work activities with employer were the predominant prevailing factor in causing his bilateral carpal tunnel syndrome. Dr. Van Ryn came to this conclusion despite the numerous inconsistencies regarding the symptom onset date and the fact that no treating doctor had found, or even mentioned, that his carpal tunnel syndrome was work-related. We do not find Dr. Van Ryn's opinions credible.
"In a workers' compensation case, the claimant carries the burden of proving all essential elements of the claim." Fischer v. Archdiocese of St. Louis-Cardinal Ritter Institute, 793 S.W.2d 195, 198 (Mo. App. 1990). To prove causation "[a] claimant must submit medical evidence establishing a probability that working conditions caused the disease...." Jacobs v. City of Jefferson, 991 S.W.2d 693, 698 (Mo. App. 1999). In this case, we find that the only medical evidence establishing a probability that employee's working conditions caused his carpal tunnel syndrome is not credible. Therefore, we find that employee failed to satisfy his burden of proof that he sustained an occupational disease which arose out of his employment with employer.