In this case, the claimant filed a Claim for Compensation alleging an occupational disease "March 2004 - May 2004" resulting in injuries to her knees because she was ordered to work in the chassis department by management. See Exhibit 13.
The statute provides that an occupational disease is defined 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. . ." Section 287.067.1, RSMo 2000. An occupational disease is compensable if it is clearly work related and meets the requirements of an injury which is compensable as provided in subsections $2 \& 3$ of section 287.020. An occupational disease is not compensable merely because work was a triggering or precipitating factor. Section 287.067.2, RSMo 2000.
An informative legal analysis of occupational diseases pursuant to Missouri law is found in Kelley v. Banta and Stude Const. Co., Inc., 1 S.W.3d 43 (Mo. App. E.D. 1999), from which the following legal principles are cited:
In order to support a finding of occupational disease, employee must provide substantial and competent evidence that he/she has contracted an occupationally induced disease rather than an ordinary disease of life. The inquiry 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.
Claimant must also establish, generally through expert testimony, the probability that the claimed occupational disease was caused by conditions in the work place. Claimant must prove "a direct causal connection between the conditions under which the work is performed and the occupational disease." However, such conditions need not be the sole cause of the occupational disease, so long as they are a major contributing factor to the disease. A single medical opinion will support a finding of compensability even where the causes of the disease are indeterminate. The opinion may be based on a doctor's written report alone. Where the opinions of medical experts are in conflict, the fact-finding body determines whose opinion is the most credible. Where there are conflicting medical opinions, the fact finder may reject all or part of one party's expert testimony which it does not consider credible and accept as true the contrary testimony given by the other litigant's expert.
In conformity with the above-cited case law, the instant case is controlled by the "last exposure rule", sometimes referred to as the "rule of convenience" which has been the law in Missouri for many years. In a workers' compensation case in Missouri, based upon occupational disease, liability accrues and attaches to the employer as of the date of the disability. The test for determining when compensation accrues is the time when incapacity from occupational disease occurs, and not when the exposure commences or the disease begins and continues to develop. It
is disability after exposure in the employer's business that creates the obligation to compensation. Because the development of occupational diseases is characteristically gradual, but variable in different diseases and with different persons, the earlier stages being frequently undetectable, the only rule which ensures the benevolent legislative objective of recovery in every meritorious case is one which fixes liability at the single and easily determinable point when there is inability to work.
"[T]he question of causation is one for medical testimony, without which a finding for claimant would be based upon mere conjecture and speculation and not on substantial evidence." Elliot v. Kansas City, Mo., Sch. Dist., 71 S.W.3d 652, 658 (Mo.App. W.D. 2002). Accordingly, where expert medical testimony is presented, "logic and common sense," or an ALJ's personal views of what is "unnatural," cannot provide a sufficient basis to decide the causation question, at least where the ALJ fails to account for the relevant medical testimony. Cf. Wright v. Sports Associated, Inc., 887 S.W.2d 596, 600 (Mo. banc 1994) ("The commission may not substitute an administrative law judge's opinion on the question of medical causation of a herniated disc for the uncontradicted testimony of a qualified medical expert."). Van Winkle v. Lewellens Professional Cleaning, Inc., 358 S.W.3d 889, 897, 898 (Mo.App. W.D. 2008).
In this case, the claimant had a prior history of injury to her right knee. In 1985, she went to plant medical and told them she hurt her right knee stepping off a curb after completing her shift. Dr. William Sedgwick evaluated her on November 19, 1985, at which time he diagnosed posterior tibial tendinitis and a strain to the right knee. He placed the claimant on Naprosyn and ordered physical therapy. See Exhibit 5.
The claimant suffered a second injury to her right knee on July 10, 1991, and consulted Dr. Mell on July 22, 1991, with a history of getting her right foot caught on a grate and twisting her right knee. She initially went to the plant facility and had ice applied, was placed in a brace, and had x-rays. On August 29, 1991, Dr. Mell performed an arthroscopy and arthroscopic excision for a right bucket-handle tear of the medial meniscus, along with removal of loose bodies and articular cartilage and he shaved areas of chondromalacia. See Exhibit 2. Dr. Mell's post-op diagnosis for the 1991 surgical procedure was a medial meniscus bucket-handle tear; chondromalacia of the medial femoral condyle and tibial plateau; articular cartilage loose bodies; and anterior cruciate ligament deficit. See Exhibit 2. The claimant filed a Claim for Compensation for the 1991 injury and settled her case on the basis of a 221 / 2 % permanent partial disability. See Exhibit 7.
The claimant testified that she continued having problems with her right knee leading up to May 2004. On August 29, 2000, she returned to Dr. Mell with a history of doing well until three years prior when she began having right knee pain. The doctor notes that she was walking with a limp and experiencing catching, locking, grinding and swelling in the knee. Dr. Mell diagnosed bilateral degenerative arthritis in the medial compartments of both knees, the right worse than the left. On that visit, Dr. Mell injected the right knee and gave her a prescription for Naprosyn. He noted that the claimant was not interested in having more aggressive treatment at that time and he advised that she should work at a job which does not require her to walk or stand continuously, but to be able to sit periodically. See Exhibit 3. The evidence is clear that the claimant suffers from osteoarthritis and that the condition degenerated to the point that the claimant required bilateral knee replacement surgery in 2005 and 2006.
The claim alleges that the claimant suffered an injury to her knees from working for six weeks in the employer's chassis department from March 2004 through May 2004. The claimant testified that during March through May 2004, she had been transferred to the chassis department. She worked six weeks during that period of time. The parties stipulated that she was off work on short-term disability from October 8, 2003 until March 22, 2004. See Exhibit 13 .
The forensic medical evidence diverges on whether the claimant's work during that period meets the criteria stated above to constitute a compensable case. Dr. Meyers opined that the claimant's "20-year period of working on the assembly line of General Motors was the prevailing factor, substantial factor, in causing her to develop bilateral osteoarthritis, requiring bilateral total knee replacements and a traumatic injury to the right knee, requiring meniscectomy, with continuing symptoms." See Dr. Meyers' deposition, page 27. "It is my opinion that they were work related." See Dr. Meyers' deposition, page 28. He opined that "activities of daily living and your work activities do indeed relate to the development of arthritis; it can certainly aggravate - and depending on the rapidity with which it may occur." See Dr. Meyers' deposition, page 27.
Dr. Nogalski also diagnosed bilateral knee osteoarthritis and opined that the claimant underwent bilateral total knee replacements as a result of that condition. However, he opined that the claimant's job duties were not a substantial factor causing her symptoms or her diagnosis and that the claimant's knee replacements were not needed to cure and relieve the effects of her job duties. See Dr. Nogalski deposition, pages 9-10. Dr. Nogalski based his conclusions on a detailed medical history that during the three to four year period leading up to the date of her claim, she worked four or five jobs on an assembly line and then had an opportunity to sit down, when needed. Then she was transferred to a job involving lifting shocks and axles as well as continuously walking on her legs, but he noted that the job lasted for only six weeks and then she was moved back to her old job. He noted that her old job allowed her to sit down for periods of time, but the six-week position did not. See Dr. Nogalski deposition, pages 6-7. Dr. Nogalski found that while working at the transfer position for about six weeks, she did not work in any unusual positions, nor did she have to squat but did continuously walk. Additionally, the claimant did not relate any specific twisting or other types of activities within that job that would have stressed her knees. See Dr. Nogalski deposition, page 8.
In comparing the two evaluations, the claimant's medical expert, Dr. Meyers, concluded that she suffered knee injuries from working at the plant for a 20-year period, which covers the span of most of her employment with this employer and at least three claims for compensation regarding her knee condition, 1991, 2004, and 2009. He did not identify a specific history relating to the six-week period that is the subject of this claim. In addition, he stated that various aspects of the claimant's work and activities of daily living that he opined can contribute to osteoarthritis. However, he did not opine (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. He did not address the specific contribution, if any, of the work performed in the chassis department during the six-week period discussed in the claim
filed by the claimant. Dr. Meyers could not identify how often the claimant had to bend or squat or how long the claimant had to walk at work. See Dr. Meyers' deposition, pages 41-43.
On the other hand, Dr. Nogalski was provided with much more detailed information with respect to the claimant's job duties. Dr. Nogalski testified that the three to four year period leading up to the date of her claim, she would work four or five jobs on an assembly line and then had an opportunity to sit down, when needed. Then she was transferred to a job involving lifting shocks and axles as well as continuously walking on her legs, but he noted that the job lasted for only six weeks and then she was moved back to her old job. He testified that her old job allowed her to sit down for periods of time, but the six week position did not. See Dr. Nogalski deposition, pages 6-7. Dr. Nogalski testified that while working at the transfer position for about six weeks, she did not work in any unusual positions, nor did she have to squat but did continuously walk. Additionally, the claimant did not relate any specific twisting or other types of activities within that job that would have stressed her knees. See Dr. Nogalski deposition, page 8. Dr. Nogalski diagnosed bilateral knee osteoarthritis and opined that she underwent bilateral total knee replacements as a result of that condition. However, he opined that the claimant's job duties were not a substantial factor causing her symptoms or her diagnosis or that the claimant's knee replacements were needed to cure and relieve the effects of her job duties. See Dr. Nogalski deposition, pages 9-10. Dr. Nogalski did not attribute any of the permanent partial disability to her knees to her work for this employer. See Dr. Nogalski deposition, page 12 .
Looking at the central question relating to osteoarthritis from the standpoint of the Mayo Clinic, the condition "occurs when the cartilage that cushions the ends of bones in joints deteriorates over time. Cartilage is a firm, slippery tissue that permits nearly frictionless joint motion. In osteoarthritis, the slick surface of the cartilage becomes rough. Eventually, if the cartilage wears down completely, one may be left with bone rubbing on bone." According to the same source, the risk factors for osteoarthritis include:
- Older age. The risk of osteoarthritis increases with age.
- Sex. Women are more likely to develop osteoarthritis, though it isn't clear why.
- Bone deformities. Some people are born with malformed joints or defective cartilage, which can increase the risk of osteoarthritis.
- Joint injuries. Injuries, such as those that occur when playing sports or from an accident, may increase the risk of osteoarthritis.
- Obesity. Carrying more body weight puts added stress on your weight-bearing joints, such as your knees.
- Certain occupations. If your job includes tasks that place repetitive stress on a particular joint, that joint may eventually develop osteoarthritis.
- Other diseases. Having diabetes, underactive thyroid, gout or Paget's disease of bone can increase your risk of developing osteoarthritis.
This analysis presents a complicated question that is not clearly answered by the claimant's forensic expert. The narrow question in this case based on the claim as filed is whether the work performed by the claimant during six weeks from March to May 2004 was a substantial factor causing the claimant's disabling condition in her knees. Clearly, the claimant
had bilateral degenerative arthritis as early as August 2000. See Exhibit 3. By that time, she had right pain and swelling, walked with a limp, and had catching, locking, grinding, and swelling in her knee, but no giving way. See Exhibit 3. At that time, x-rays revealed bone on bone in both knees with the knees in extension. See Exhibit 3. Dr. Meyers testified that "her twenty-year period of working on the assembly line of General Motors was the prevailing factor, substantial factor, in causing her to develop bilateral osteoarthritis, requiring bilateral total knee replacements, and a traumatic injury to the right knee, requiring meniscectomy, with continuing symptoms and impairment." See Dr. Meyers' deposition, page 27. He did not specify when the 20-year period began or when it ended nor did he identify the specific features of the claimant's work in the chassis department that increased her exposure to osteoarthritis. If one could recast the claim for compensation to suggest a period that fits the claimant's forensic evidence, the situation might be different. For instance, would the claimant be entitled to recover for her osteoarthritis in both her 2004 case and her 2009 case? Based on the evidence presented, the defense prevails on this issue.