Holbrook, P. J.
On November 6, 1968, while employed as a cookie packer for the Keebler Company, the plaintiff fell in the parking lot and suffered an injury to her knees. Defendant-appellant, Liberty Mutual Insurance Company, was the workmen’s compensation insurer at the time of the accident. The plaintiff consulted the company doctor and missed several days of work due to problems with her knees. Plaintiff returned to the same job, doing somewhat less standing, and in
April 1969 suffered another injury when she fell from a stool. The defendant-appellee, Lumbermen’s Mutual Casualty Company, was insurer at this time. On November 26, 1969, the plaintiff petitioned for a hearing with the Workmen’s Compensation Bureau. The hearing was held on November 19, 1970. At the hearing, a doctor’s deposition described the plaintiff’s condition as a softening or fraying of the knee cartilage and stated that the fall in April 1969 probably intensified the plaintiff’s condition; but that the primary cause of the disability was the November 1968 injury. The plaintiff testified that the discomfort and pain from her knees had grown progressively worse. The referee found that Helen Gibbs suffered a compensable injury on November 6, 1968, which injury was the sole cause of her current disability. The referee specifically found that the injury of April 1969 did not relate to the disability.
The referee’s order for compensation was affirmed upon appeal by the Workmen’s Compensation Appeal Board (hereinafter referred to as WCAB), in an opinion which sets forth its findings. The WCAB, however, did increase the rate of interest on the award from 5% to 6%. Two issues are here presented for consideration. Compensability is not at issue, rather the primary issue to be decided is which insurance carrier is liable for such compensation.
In
Moore v Gundelfinger,
56 Mich App 73; 223 NW2d 643 (1974), this Court reiterated the teaching of
McClary v Wagoner,
16 Mich App 326, 328; 167 NW2d 800, 801 (1969), and
Lamb v John's Tavern, 37
Mich App 678; 195 NW2d 278 (1972), to the effect that the WCAB must indicate the testimony adopted, the standard followed, and the reasoning used in reaching a decision. Further, Justice
O’Hara’s statement in
Couch v Saginaw Malleable Iron Plant, Central Foundry Division of General Motors Corp,
51 Mich App 317, 321-322; 214 NW2d 885, 887-888 (1974), that the WCAB "should make those findings clear and unequivocal” was set out. In the present case, in pertinent part, the WCAB stated:
"Medical testimony by James Glessner, Jr., M.D., establishes that plaintiff has chondromalacia of both knees, more on the right than the left, that this is a condition
almost
certainly due to trauma in her case, the initial fall in the parking lot in November, 1968,
possibly aggravated by the fall from the stool at work on April 6, 1969, and/or by the general duties of her job which required some standing, bending and, on occasion, crawling under the conveyor belt which carried the cookies, in order to perform an operation on the other
side."(Emphasis supplied.)
As the board found the condition was "almost certainly” due to the injury in the parking lot which was "possibly aggravated by the fall from the stool * * * and/or by the general duties of her job”, the opinion is not clear and unequivocable. The testimony adopted is obvious as that was the only medical testimony introduced. The legal standard applied is certainly less obvious. The reasoning used may only be inferred by this Court. Logic discloses that the cause of
disability,
in this case, could be due to four distinct and different situations,
each with differing operational definitions and which could lead to differing conclusions as to which carrier is liable for the compensation award.
The first possible cause of disability in this case is the first traumatic injury. This is the obvious
workmen’s compensation claim where there is a clearly specifiable injury, occurring on a given date,
i.e.,
attributable to a single event. See, for instance,
Schinderle v Ford Motor Co,
316 Mich 387; 25 NW2d 568 (1947).
The second situation is where a single distinguishable traumatic injury
and
the working conditions cause disability. This may be said to be the situation where a preexisting injury, condition, or infirmity is aggravated to disability, or where the injury is not attributable to a single event.
See, for instance,
Sheppard v Michigan National Bank,
348 Mich 577, 585; 83 NW2d 614, 617 (1957), where it is said:
"[W]e clearly established at an early date that disability caused by an aggravation of a pre-existing condition by a compensable event was compensable. We were not concerned with the nature of the pre-existing condition. Our attention, rather, went to the nature of the event causing the final disability.”
This situation may also include the so-called occupational disease cases. See
Smith v Lawrence Baking Co,
370 Mich 169; 121 NW2d 684 (1963),
Sosnowski v Dandy Hamburger,
384 Mich 221; 180 NW2d 761 (1970), and generally 25 Callaghan’s Michigan Civil Jurisprudence, Workmen’s Compensation, § 49, pp 404-405.
The third possibility is that there have been two successive traumatic injuries from which either the first or both in combination have caused disability. In this regard, in 3 Larson’s Workmen’s Compensation Law, §95.12, pp 508.130-508.133, Professor Larson has written:
"The Massachusetts-Michigan rule in successive-injury cases is to place full liability upon the carrier covering the risk at the time of the most recent injury that bears a causal relation to the disability.
"If the second injury takes the form merely of a recurrence of the £rst, and if the second incident does not contribute even slightly to the causation of the disabling condition, the insurer on the risk at the time of the original injury remains liable for the second.
In this class would fall most of the cases discussed in the section on range of consequences in which a second injury occurred as the direct result of the first, as when claimant falls because of crutches which his first injury requires him to use.
This group also includes the kind
of case in which a man has suffered a back strain, followed by a period of work with continuing symptoms indicating that the original condition persists, and culminating in a second period of disability precipitated by some lift or exertion.
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Holbrook, P. J.
On November 6, 1968, while employed as a cookie packer for the Keebler Company, the plaintiff fell in the parking lot and suffered an injury to her knees. Defendant-appellant, Liberty Mutual Insurance Company, was the workmen’s compensation insurer at the time of the accident. The plaintiff consulted the company doctor and missed several days of work due to problems with her knees. Plaintiff returned to the same job, doing somewhat less standing, and in
April 1969 suffered another injury when she fell from a stool. The defendant-appellee, Lumbermen’s Mutual Casualty Company, was insurer at this time. On November 26, 1969, the plaintiff petitioned for a hearing with the Workmen’s Compensation Bureau. The hearing was held on November 19, 1970. At the hearing, a doctor’s deposition described the plaintiff’s condition as a softening or fraying of the knee cartilage and stated that the fall in April 1969 probably intensified the plaintiff’s condition; but that the primary cause of the disability was the November 1968 injury. The plaintiff testified that the discomfort and pain from her knees had grown progressively worse. The referee found that Helen Gibbs suffered a compensable injury on November 6, 1968, which injury was the sole cause of her current disability. The referee specifically found that the injury of April 1969 did not relate to the disability.
The referee’s order for compensation was affirmed upon appeal by the Workmen’s Compensation Appeal Board (hereinafter referred to as WCAB), in an opinion which sets forth its findings. The WCAB, however, did increase the rate of interest on the award from 5% to 6%. Two issues are here presented for consideration. Compensability is not at issue, rather the primary issue to be decided is which insurance carrier is liable for such compensation.
In
Moore v Gundelfinger,
56 Mich App 73; 223 NW2d 643 (1974), this Court reiterated the teaching of
McClary v Wagoner,
16 Mich App 326, 328; 167 NW2d 800, 801 (1969), and
Lamb v John's Tavern, 37
Mich App 678; 195 NW2d 278 (1972), to the effect that the WCAB must indicate the testimony adopted, the standard followed, and the reasoning used in reaching a decision. Further, Justice
O’Hara’s statement in
Couch v Saginaw Malleable Iron Plant, Central Foundry Division of General Motors Corp,
51 Mich App 317, 321-322; 214 NW2d 885, 887-888 (1974), that the WCAB "should make those findings clear and unequivocal” was set out. In the present case, in pertinent part, the WCAB stated:
"Medical testimony by James Glessner, Jr., M.D., establishes that plaintiff has chondromalacia of both knees, more on the right than the left, that this is a condition
almost
certainly due to trauma in her case, the initial fall in the parking lot in November, 1968,
possibly aggravated by the fall from the stool at work on April 6, 1969, and/or by the general duties of her job which required some standing, bending and, on occasion, crawling under the conveyor belt which carried the cookies, in order to perform an operation on the other
side."(Emphasis supplied.)
As the board found the condition was "almost certainly” due to the injury in the parking lot which was "possibly aggravated by the fall from the stool * * * and/or by the general duties of her job”, the opinion is not clear and unequivocable. The testimony adopted is obvious as that was the only medical testimony introduced. The legal standard applied is certainly less obvious. The reasoning used may only be inferred by this Court. Logic discloses that the cause of
disability,
in this case, could be due to four distinct and different situations,
each with differing operational definitions and which could lead to differing conclusions as to which carrier is liable for the compensation award.
The first possible cause of disability in this case is the first traumatic injury. This is the obvious
workmen’s compensation claim where there is a clearly specifiable injury, occurring on a given date,
i.e.,
attributable to a single event. See, for instance,
Schinderle v Ford Motor Co,
316 Mich 387; 25 NW2d 568 (1947).
The second situation is where a single distinguishable traumatic injury
and
the working conditions cause disability. This may be said to be the situation where a preexisting injury, condition, or infirmity is aggravated to disability, or where the injury is not attributable to a single event.
See, for instance,
Sheppard v Michigan National Bank,
348 Mich 577, 585; 83 NW2d 614, 617 (1957), where it is said:
"[W]e clearly established at an early date that disability caused by an aggravation of a pre-existing condition by a compensable event was compensable. We were not concerned with the nature of the pre-existing condition. Our attention, rather, went to the nature of the event causing the final disability.”
This situation may also include the so-called occupational disease cases. See
Smith v Lawrence Baking Co,
370 Mich 169; 121 NW2d 684 (1963),
Sosnowski v Dandy Hamburger,
384 Mich 221; 180 NW2d 761 (1970), and generally 25 Callaghan’s Michigan Civil Jurisprudence, Workmen’s Compensation, § 49, pp 404-405.
The third possibility is that there have been two successive traumatic injuries from which either the first or both in combination have caused disability. In this regard, in 3 Larson’s Workmen’s Compensation Law, §95.12, pp 508.130-508.133, Professor Larson has written:
"The Massachusetts-Michigan rule in successive-injury cases is to place full liability upon the carrier covering the risk at the time of the most recent injury that bears a causal relation to the disability.
"If the second injury takes the form merely of a recurrence of the £rst, and if the second incident does not contribute even slightly to the causation of the disabling condition, the insurer on the risk at the time of the original injury remains liable for the second.
In this class would fall most of the cases discussed in the section on range of consequences in which a second injury occurred as the direct result of the first, as when claimant falls because of crutches which his first injury requires him to use.
This group also includes the kind
of case in which a man has suffered a back strain, followed by a period of work with continuing symptoms indicating that the original condition persists, and culminating in a second period of disability precipitated by some lift or exertion.
"On the other hand, if the second incident contributes independently to the injury, the second insurer is solely liable, even if the injury would have been much less severe in the absence of the prior condition, and even if the prior injury contributed the major part to the final condition. This is consistent with the general principle of the compensability of the aggravation of a preexisting condition.”* ***
(Emphasis supplied.)
The fourth situation, which is conceivably applicable in the present case, is where the two single traumatic injuries in combination with the working conditions cause disability. This is, in the factual context of this case, the situation outlined as number 2 above.
Of the two carriers here in conflict, under the foregoing situations, in the first, the first carrier is liable; in the second, the second carrier is liable; in the third, either the first or second could be liable depending upon the causal relationship between injuries and disability; and, in the fourth, the second carrier is liable. Thus, we must remand for determination of which of the foregoing situations is present. While we may seemingly be asking the WCAB to determine what could not be so determined by physicians with medical certainty,
i.e.,
the date of disability, the WCAB is charged as the trier of facts in these cases and, as such, must
make such determination. Our decision herein is not a futile action, rather it is a consistent conclusion with that of the similar case of
Baareman v Blackport Packing Co,
16 Mich App 429; 168 NW2d 324 (1969),
lv den
382 Mich 778 (1969). In that case, the claimant suffered a fall in June 1962. On May 25, 1964, after lifting and carrying over a 10-hour period, plaintiff collapsed and was hospitalized. In June 1964, claimant returned to work, on a different job. In January 1965, claimant fell and sustained a hernia. He was hospitalized for corrective surgery. After the surgery, in February 1965, he returned to work, but back problems persisted until plaintiff again sought medical attention and, in November 1965, surgery was performed. The defendant-employer had been insured by three different insurance companies from 1958 until the date plaintiff last worked. The workmen’s compensation referee found that the claimant suffered a personal injury on May 25, 1964. This Court found that "there seems to have been no question that the conditions characteristic of and peculiar to the nature of plaintiff’s employment made him a prime candidate for occupational disability due to a back injury
* * * ”,
16 Mich App 432; 168 NW2d 325. After quoting from MCLA 417.1(c); MSA 17.220(c); MCLA 417.1(a); MSA 17.220(a); and MCLA 417.2; MSA 17.221, the Court found "that in order to make a correct finding as to the date Mr. Baareman suffered his disabling personal injury, it is necessary first to determine at what point he reached 'the state of being disabled’ as defined by the act”.
Id.
at 433; NW2d at 326. The Court found it was further necessary to decide whether the disability was worsened by subsequent work activity and said that it had been guided by
Smith v Lawrence Baking Co,
370 Mich 169; 121 NW2d 684 (1963). The case was remanded for specific findings.
The assertion that the WCAB’s award of 6% interest per annum is incorrect is answered by this Court’s opinion in
Morris v Baker Auto Parts,
57 Mich App 65; 225 NW2d 179 (1974), which we choose to follow.
Affirmed as to the interest issue, and reversed and remanded for the WCAB to make full findings of fact delineating the standards of law used in determining this matter. We do not retain jurisdiction.
All concurred.