Based on the above exhibits and the testimony presented at the hearing, I make the following findings:
- The claimant is a 55-year-old woman who is right hand dominant.
- The claimant began her employment with Meramec Group, Inc. (the employer), in 1989. She is currently a team leader in the PU molding unit. As a team leader, the claimant weighs shoe soles to check their weight, and inspects the soles for color and trim quality. The heaviest shoe sole she inspects or weighs is 300 grams ( 454 grams equals one pound).
- The claimant works on the first work shift, which runs between 7:00 a.m. and 3:00 p.m. She has a 20-minute lunch break and two 10-minute breaks. During the course of a year, the claimant is usually laid off for a period, often from November to February, or her hours are reduced.
- Every morning, the claimant weighs approximately 96 pairs of shoe soles. During this task, she takes pairs of shoe soles out of boxes and puts the soles on a scale, one at a time, to weigh them.
- The claimant is also responsible for inspecting shoe soles. To perform this task, she takes shoe soles out of a box and turns them all the way around to inspect the color. When inspecting shoe soles, if the claimant notices that the trim on a sole is not correct, she takes the sole and puts it on a trimmer. The trimmer has a round wheel on it. The claimant grips the shoe sole between her thumb and first forefinger, moving the sole across the trimmer in a semi-circle motion. When using the trimmer, the claimant has to put force on the shoe sole to hold it in place and to turn the sole. In an average day, she will re-trim about 50 pairs of soles.
- In addition, the claimant inspects boxes of shoe soles while they are still on the shelves. She pulls pairs of shoe soles out for inspection, looking for color, trim, and weight. She rejects a sole if it is defective and does not meet standards. The claimant usually audits one person a day by going through that worker's boxes. A box contains 18 to 20 pairs of shoe soles. On average, the claimant inspects 20 boxes a day.
- The claimant has problems in her left hand and thumb, including where the base of her thumb meets the hand and wrist. These complaints began around March 2007. Initially, the complaints subsided. By April 2007,
however, her complaints did not go away.
- On April 25, 2007, the claimant told her supervisor, Karen Flowers, that she had hurt her left hand. The claimant completed an Employee Injury Report, and Ms. Flowers completed a Supervisor's Incident Investigation Report. The employer sent the claimant to see Dr. Bobby Enkvetchakul.
- The claimant first saw Dr. Enkvetchakul on April 26, 2007. His diagnosis was left thumb pain. He provided her with a thumb splint and directed her to take Naprosyn, an anti-inflammatory medication. His records note that the pain is probably arthritic in nature but that it was not really clear. A radiology exam report from April 27, 2007, indicates that there are mild arthritic changes throughout the hand. The claimant again saw Dr. Enkvetchakul on May 3, 2007. The diagnosis was still left thumb pain. Dr. Enkvetchakul noted that the Naprosyn was not helping, so he switched her to Indomethacin and ordered a bone scan. Dr. Enkvetchakul's May 11, 2007 records indicate that a Finkelstein's test was equivocal and a Watson test was negative, as was the CMC grind test. He also noted that the results of the bone scan were completely normal. His diagnosis continued to be simply left thumb pain. He directed her to continue wearing the splint, and prescribed a Medrol dose pack.
- On May 18, 2007, the claimant returned for a follow-up visit with Dr. Enkvetchakul. The doctor diagnosed her with left-sided de Quervain's syndrome. He gave her an injection of Lidocain in the first extensor compartment of the wrist. Post-injection examination revealed 100 % relief of her symptoms, so he performed a second injection of Lidocain with 20 mg . of Kenalog into the first dorsal extensor compartment of the wrist. He released her to full duty with no restrictions.
- The claimant again visited Dr. Enkvetchakul on May 30, 2007, due to a recurrence of her left thumb pain. She indicated that the May 18th injection helped for about two or three days, until she started using her hand again. The doctor noted that the Finkelstein's test was positive, but that essentially any type of movement or testing at the wrists produced her pain complaints. He diagnosed her with de Quervain's syndrome, and provided her with a thumb spica splint. He directed her to continue taking Naprosyn. He also injected the claimant with 2 cc of 2 % Lidocain into the first dorsal extensor compartment. The post injection examination revealed 100 % relief of pain. Dr. Enkvetchakul noted that the claimant's clinical picture is a bit confusing, given that her tenderness is somewhat diffuse over the radial aspect of the left wrist. However, the claimant's response to anesthetic injection was remarkable and was most strongly suggestive of de Quervain's syndrome.
- The claimant then attended all six scheduled sessions at ProRehab in early June 2007. A report, dated June 13, 2007, indicates that the claimant was able to improve left thumb range of motion. She continued to guard the thumb and presents with increased subjective complaints with the use of the thumb in certain directions, and if resting without the splint. The report indicates that the claimant put forth good effort during the treatment sessions, but was not able to resolve her pain.
- On June 15, 2007, the claimant followed up with Dr. Enkvetchakul. At this time, he noted that the Finkelstein test was distinctly negative, but that she did have pain with extension and abduction of the left thumb. The grind test produced some complaints of pain at the CMC joint. His diagnosis was left thumb and wrist pain of unknown etiology. He directed her to continue wearing the thumb spica splint. He gave her sample of
Celebrex. He noted that her clinical picture is not clear, and he cannot localize where her complaints are coming from. He referred her for a second opinion. He also released her to return to work at full duty with no restrictions.
- The employer/insurer later sent the claimant to Dr. David Brown for an independent medical evaluation. The claimant saw Dr. Brown on August 1, 2007. Dr. Brown is board certified in plastic and reconstructive surgery, with the added certification in the subspecialty of hand surgery. In the history portion of his report, he indicates that the claimant told him that she first developed problems with her left thumb in January 2007. She stated that the base of her left thumb is very tender. She could not recall any specific traumatic injury. Dr. Brown noted that on examination, the claimant had a positive shoulder sign at the base of her left thumb. The grind test was positive and the Finkelstein test was negative. There was no triggering, and the Watson's test was negative. She had a negative Tinel's and direct compression test over the carpal tunnel. The Phalen's test was negative. He xrayed both of her hands and noted that there was significant arthritic changes at the base of the left thumb compared to the right. His impression was osteoarthritis at the base of the left thumb at the trapeziometacarpal joint and STT joint. His recommendation was for her to wear a thumb spica splint, and that she might benefit from a steroid injection in the trapeziometacarpal joint. He also recommended that she take a non-steroidal antiinflammatory medication. He noted that if her symptoms fail to improve after an extensive course of conservative treatment, an option would be surgical intervention in the form of a CMC arthroplasty.
- Dr. Brown noted that trapeziometacarpal joint osteoarthritis is very common in women in their fifties. He stated that this is a medical condition related to the natural aging process. He does not believe that the osteoarthritis at the base of her left thumb is related to her work, with her work being considered the prevailing causative factor. He noted that she could work without restrictions.
- Following her visit to Dr. Brown, the claimant did not treat with any other provider until February 2008. She testified credibly, however, that she continued to have left thumb pain during the period of August 2007 through February 2008.
- On February 9, 2008, the claimant treated at the Washington County Memorial Hospital Emergency Room for left thumb complaints. The records indicate that the claimant went to the emergency room after she rolled over in bed at her home, causing her left thumb to pop; this resulted in severe pain. The claimant thought that she had broken her thumb. X-rays indicated that there were no visible fractures.
- On June 27, 2008, the claimant saw Dr. Bruce Schlafly on her own. Dr. Schlafly examined the claimant and found that she had a positive Finkelstein test for de Quervain's tendonitis at the left wrist. He noted swelling in the region of the thumb CMC joint. He took x-rays of her left wrist and thumb, which showed subluxation and narrowing of the CMC joint at the base of the thumb metacarpal. His diagnosis was de Quervain's tendonitis of the left wrist and painful subluxation and osteoarthritis at the CMC joint at the base of the metacarpal of the left thumb. He noted that over the past year, the claimant had already tried the various methods of non-operative treatment, including the use of a splint, physical therapy, anti-inflammatory medication, and cortisone injections. He recommended surgery for pain relief. Specifically, he recommended a tendon interposition arthroplasty of the CMC joint, along with a de Quervain's tendon sheath release of the left wrist.
- In his June 2008 report, Dr. Schlafly opined that her repetitive work with her hands at the shoe factory is "the substantial and prevailing factor" in the cause of the de Quervain's tendonitis of the left wrist and the painful subluxation and osteoarthritis at the base of the left thumb, and in the need for the treatment that she has already received and in the need for the surgical treatment.
- On September 5, 2008, Dr. Brown, at the request of the employer/insurer, reviewed Dr. Schlafly's June 2008 report. In a supplemental report, dated September 5, 2008, Dr. Brown noted that Dr. Schlafly also diagnosed osteoarthritis at the base of the thumb (also known as the CMC joint of the thumb and trapeziometacarpal joint). Dr. Brown stated that the "painful subluxation" that Dr. Schlafly mentions is not a separate diagnosis, but simply a manifestation of osteoarthritis at the base of the thumb. Dr. Brown did not agree with the diagnosis of left de Quervain's tendinits. He stated that when he examined the claimant, she was not tender over the first dorsal compartment, and that provocative testing for de Quervain's (Finkelstein's testing) was negative. Dr. Brown further stated that patients with osteoarthritis at the base of the thumb are often misdiagnosed with de Quervain's tendinits since the first dorsal compartment is adjacent to the base of the thumb. In his opinion, the fact that her previous steroid injection in the first dorsal compartment failed to relieve her pain is also consistent with her pain not being due to tendonitis of the first dorsal compartment (de Quervain's tendonitis). Dr. Brown also indicated that osteoarthritis at the base of the thumb is more common in women, and that the incidence increases with age. He stated that osteoarthritis at the base of the thumb is common in women in their fifties.
- Dr. Schlafly's deposition, taken October 16, 2008, indicates that he is board certified in hand surgery and orthopedic surgery, although he limits his practice to the hand and upper extremity. In Dr. Schlafly's opinion, the claimant has de Quervain's tendinits, which is a type of tendinits that occurs at the wrist near the base of the thumb and involves tendons cross the wrist going to the thumb. In his opinion, the claimant's repetitive work and use with her left hand in her employment caused her de Quervain's tendinitis. Specifically, he believes that the Claimant's repetitive gripping, grasping, and pinching with her left hand lead to the development of de Quervain's tendinitis. Dr. Schlafly also indicated that the claimant suffers from a subluxation and narrowing of the CMC joint at the base of the thumb. He explained that the subluxation is a partial dislocation of the metacarpal of the thumb opposite the trapezium bone on which the thumb metacarpal rests. Dr. Schlafly pointed out, on the x-rays, how the claimant's thumb metacarpal is not anatomically aligned as in a normal thumb CMC joint; instead, the thumb metacarpal is resting somewhat off center. He stated that stretching out of the ligaments causes the joint to rest somewhat off center. As for the cause of this stretching out or attenuation of the ligament, he stated that progressive repetitive forces placed on the thumb progressively stretch out the ligament - such as the repetitive work that the claimant described doing at the shoe factory. Dr. Schlafly further testified that when a subluxation of a joint occurs, the cartilage wears out and causes arthritic changes and narrowing. Dr. Schlafly clarified that repetitive grasping of items, applying forces to the thumb numerous times during the workday, caused the attenuation of the ligament. Dr. Schlafly acknowledged that this condition is more likely to be found in someone claimant's age (fifties) than in a teenager, and that it is more likely to be found in a woman of this age than in a man of this age. In his opinion, however, neither claimant's age nor her gender is the prevailing factor in the cause of her condition.
- Dr. Schlafly testified that the pain that the claimant is experiencing comes from the subluxation and arthritis at the CMC joint, and the wrist pain relates to the tendinitis. He stated that repetitive work would aggravate the pain.
- Dr. Schlafly did not x-ray the claimant's right hand as she had no complaints with the right hand. He acknowledged that he does not know why she did not develop pain in the right hand. Dr. Schlafly testified that it is more common to develop de Quervain's tendinits from repetitive usage as opposed to one singe episode of
trauma, but that episode of trauma could cause it. However, he has never heard of an incident like the one where the claimant rolled over in bed as causing de Quervain's tendinitis.
- When discussing why the claimant might have had a positive result on one Finkelstein's test and a negative result on another, Dr. Schlafly testified that tendinitis conditions "can come and go, wax and wane.... Dr. Schlafly also testified that it is possible that a cortisone injection could have a beneficial effect two weeks later or even tow months later, or even permanently. When asked whether a cortisone injection on May 18, followed by an anesthetic injection on May 30, have affected the outcome of a Finkelstein's test on June 15, Dr. Schafly indicated that it could.
- As for future treatment, Dr. Schlafly believed that conservative measures had failed and therefore it would be appropriate to do surgery for pain relief. He agreed that it would not be unreasonable to try more injections or non-steroidal anti-inflammatory medications, but that he did not think that these measures would be successful.
- In his deposition, taken October 27, 2008, Dr. Brown further explained his findings. He noted that when he examined the claimant, she had fairly classic signs of osteoarthritis at the base of the thumb or the trapeziometacarpal joint. She had what is called a positive shoulder sign, which is a squared-off looking joint at the base of the thumb. Instead of a smooth slope, she had a squared-off look to the based of the thumb, which is due to degeneration of the joint. He noted that the base of the metacarpal "kind of subluxes or kicks out," and it gives the joint a squared-off look. The claimant also had tenderness directly over the trapeziometacarpal joint, which is also called the basal joint of the thumb. And the grind test, where he grabs the thumb metacarpal and compresses it and rotates it at the joint (or grinds it), induced pain. He stated that this is typical of an arthritic joint. In Dr. Brown's opinion, it was clear that the claimant had osteoarthritis at the base of the left thumb. He pointed out that he took x-rays of both hands, and that the x-rays showed significant arthritic changes at the base of the left thumb at the trapeziometacarpal joint with narrowing of the joint and osteophyte or spur formation. There were also some associated arthritic changes at the surrounding joint called the STT joint. In addition, she had arthritic changes at the articulation between the trapezium and the scaphoid and the trapezoid. Thus, there were arthritic changes on all three joint surfaces. Dr. Brown testified that the claimant had similar findings on the right thumb, but not as severe.
- Dr. Brown testified that in his opinion, the claimant's diagnosis was osteoarthritis at the base of the left thumb at the trapeziometacarpal joint and STT joint. As for future treatment, he recommended continued conservative treatment in the form of a steroid injection in the joint, anti-inflammatory medications, and continued splinting. Then, if she failed to improve, surgery would be an option. He stated that the claimant's work for the employer was not the prevailing or primary cause of her underlying condition. Dr. Brown testified that the main reason for this opinion is that the claimant is in a high risk population for that condition. He stated that osteoarthritis at the base of the thumb is extremely common in women in their fifties. He further testified that "if I take that information and I compare it to her potential occupational factors, it's clear in my mind that the science, the studies, the facts lead me to the opinion that relative to all other factors, the work in this condition is not the most important single factor that has lead to this condition. I think it's the fact that she's in this very high risk category is the prevailing, underlying cause of her condition." Dr. Brown, however, does not actually state what potential occupational factors he is using in this comparison.
- Dr. Brown testified as to why he disagreed with Dr. Schlafly's diagnosis of de Quervain's tendinitis. He indicated that he examined the claimant for this condition and that she was non-tender over the area where
patients have de Quervain's tendinitis, and provocative testing (Finkelstein's testing) was negative. Also, the history of having no significant improvement following a steroid injection for de Quervain's tendinitis is consistent with that not being the problem. He stated that patients with de Quervain's tendinitis will at least have temporary improvement following a steroid injection. He testified that if work activities were the single most important cause of the claimant's condition, that he would expect the condition to be more severe, more symptomatic, and more advanced in the dominant hand as opposed to the non-dominant hand - and that was not the case here. In his opinion, the fact that the claimant's symptoms and her arthritic changes are more advanced in the non-dominant hand is an indirect indication that this is not related to her job activities.
- On cross-examination, Dr. Brown acknowledged that the type of repetitive work that the claimant described doing at work may have contributed to her symptoms. He also admitted that tendinitis, like de Quervain's tendinitis, is commonly seen if one does certain repetitive, hand-intensive types of jobs.
- The claimant testified that if her left thumb is not completely straight, it is painful. As a result of her left thumb complaints, she has changed the way she works. She holds her index finger beneath her left thumb to keep the thumb from moving. She cannot use her left thumb without pain. Anything that requires grabbing or clutching with her left thumb aggravates her thumb complaints. She generally does not take pain medications, but on rare occasions she will take Tylenol.
- She testified that she never experienced left hand or thumb complaints before 2007. She is not a smoker; she has not been diagnosed with rheumatoid arthritis or with a thyroid condition.
- In 2002, the claimant had work-related left shoulder problems. She did not remember being told that she had arthritic or degenerative changes in her left shoulder at that time. She did not recall being told that she had arthritis in her neck and back. Her left shoulder problems resolved, and she did not file a claim for this condition.