Claimant saw her primary care physician, Dr. Adams, in February 2013 for problems with her right thumb. The symptoms involved her hands locking up, dropping things, numbness, tingling, and being awoken at night. Dr. Adam's records noted patient presents with "right hand
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[^0]: ${ }^{1}$ Claimant raised objections to the admission of Dr. Goldfarb's records to the extent he addresses causation, although no argument in favor was including in the post trial brief. Those objections are overruled. Claimant testified Dr. Goldfarb made comments to her regarding causation, making what he actually wrote on the topic relevant and admissible. When a party opens the door to a topic, the admission of rebuttal evidence on that topic becomes permissible. Howard v. City of Kansas City, 332 S.W.3d 772, 785 (Mo. 2011).
${ }^{2}$ When Claimant was initially hired she worked the 11:00 to 7:30 shift for a year.
pain" with a history of "about 1 week of pain at base of $\mathrm{L}^{3}$ thumb." The exam showed tender base of left thumb, and the diagnosis was joint pain, likely DJD.
On April 23, 2013, Claimant saw Dr. Strecker, who noted Claimant had been having pain and stiffness in her left thumb which has progressed to the right thumb and is worse in the morning. She complained it will catch on her. The diagnosis was stenosing tenosynovitis. He started treatment with medication and a splint, but Claimant never returned for follow up.
Claimant then told Christina, her supervisor, about her hand problems. Employer sent Claimant to BarnesCare ${ }^{4}$ on August 28, 2013. She complained her hands were swollen, locking and painful and she started noticing pain and locking of thumb about 6 weeks prior. Symptoms were worse on the right and woke her at night. The exam was significant for positive Phalen's and tenderness to palpation at base of thumbs. The diagnosis was acquired trigger finger/thumb bilaterally, and unspecified neuralgia. BarnesCare referred Claimant for testing to rule out CTS.
On October 16, 2013, Claimant came under the care of Dr. R. Evan Crandall. His evaluation included review of the job analysis report, Claimant's work history, symptoms, medical history, description of her job, a generalized description of her lifting, typing, mouse, hand-writing and posture had been performed. Claimant reported she would take up to 100 calls per day and talk to customers about bills, payments and problems when their lights would go out. She did not know how many key strokes or pages she typed in a day, but she felt work caused her symptoms.
The nerve conduction studies performed by Dr. Phillips were positive for mild right CTS, very mild left CTS, and mild right ulnar neuropathy. Specifically the nerve testing showed " $[t]$ here is evidence for very mild demyelinative median sensory neuropathy across the left carpal tunnel. There is mild demyelinative ulnar motor dueropathy across the right elbow with sensory axonal involvement and this makes the lesion more significant." Dr. Crandall recommended conservative treatment, noting he did not recommend surgery for patients with minor values on their nerve conduction studies. He recommended a cortisone injection for the right trigger thumb, or a trigger thumb release if the symptoms did not resolve.
Based upon the history provided, he did not believe Claimant's work was the prevailing factor in the cause of her conditions of ulnar neuropathy, carpal tunnel syndrome ("CTS"), and trigger thumb. He has analyzed jobs of customer service representatives in the past, and did not believe those jobs were hand-intensive. He noted keyboarding has no association with cubital tunnel syndrome, and although high-level keyboard work could cause CTS, it has to exceed the OSHA guidelines of 4 hours of continuous typing per day. According to Dr. Crandall, customer service representatives never have continuous typing. He noted to meet the NIOSH guidelines, one would have to exceed 15,000 keystrokes per hour, and he did not believe Claimant would have that volume of typing activity.
Dr. Crandall noted