Opinion
WHITE, P. J.
Appellant became unable to perform his duties as a mail clerk driver for the County of San Mateo in October 1979. He had applied for service-connected disability retirement benefits in January 1979. After a hearing on his application, the respondent board of retirement issued findings of fact, denied appellant’s application, and granted him nonservice-connected disability retirement. Appellant filed a petition for writ of mandate in superior court. The court denied the petition. Appellant contends on appeal that there was no substantial evidence to support the superior court’s decision. We agree and reverse the judgment below.
Before appellant began work for the County of San Mateo on December 11, 1972, he had had no complaint of pain in his left knee, although X-rays taken in February 1972 revealed osteoarthritis in both knees. On September 11, 1973, appellant twisted his left knee getting out of his delivery truck. Four years later, appellant again twisted his left knee in the same manner. Pain in his left knee finally forced him to retire in October 1979.
Appellant’s application for service-connected disability retirement benefits is governed by Government Code section 31720. The provision, as amended, requires an applicant to have been incapacitated as a result of injury or disease arising out of and in the course of employment. Such employment must have contributed substantially to the applicant’s incapacity.1
[1043]*1043“ ‘[Pjension legislation must be liberally construed and applied to the end that the beneficent results of such legislation may be achieved. Pension provisions in our law are founded upon sound public policy and with the objects of protecting, in a proper case, the pensioner and his dependents against economic insecurity. In order to confer the benefits intended, such legislation should be applied fairly and broadly.’” (Jorgensen v. Cranston (1962) 211 Cal.App.2d 292, 296 [27 Cal.Rptr. 297].) This principle has been recognized as well settled in California (Gorman v. Cranston (1966) 64 Cal.2d 441, 444 [50 Cal.Rptr. 533, 413 P.2d 133]) and has been cited in numerous cases involving the award of county employee retirement benefits. (Heaton v. Marin County Employees Retirement Bd. (1976) 63 Cal.App.3d 421,429 [133 Cal.Rptr. 809]; Gelman v. Board of Retirement (1978) 85 Cal.App.3d 92, 97 [149 Cal.Rptr. 225]; DePuy v. Board of Retirement (1978) 87 Cal.App.3d 392, 398 [150 Cal.Rptr. 791, 12 A.L.R.4th 1150].)
Both statutory and decisional law make clear that employment need not be the sole cause of an employee’s disability in order for an award of employment-connected disability retirement to be made. (Gov. Code, § 31720; Heaton v. Marin County Employees Retirement Bd., supra, 63 Cal.App.3d at pp. 428-429.) It has been held, based on reasoning parallel to that behind the principle in workers’ compensation law, that an employer takes his employee as he finds him, and therefore any acceleration or aggravation of a preexisting disability becomes a service-connected injury of that employment (see Kuntz v. Kern County Employees’ Retirement Assn. (1976) 64 Cal.App.3d 414, 421 [134 Cal.Rptr. 501]; Buckley v. Roche (1931) 214 Cal. 241, 245-246 [4 P.2d 929]), and that an applicant for a government retirement pension will be awarded service-connected benefits where he or she can show a material and traceable connection between disability and employment. (Gelman v. Board of Retirement, supra, 85 Cal.App.3d 92.)
In Gelman, the judgment of the trial court denying the applicant’s petition for writ of mandate was reversed. The Court of Appeal held that because the record conclusively established that the applicant’s employment as a social worker aggravated his preexisting mental illness, his disability arose out of and in the course ofhis employment as a matter of law. (Id., at p. 95.) Becausewe find that the record in the present case clearly shows that appellant’s two work-related injuries as well as the day-to-day stresses of his job made his employment a substantial cause ofhis disability, we hold that his disability arose out of and in the course ofhis employment as a matter of law. The trial court’s denial of his writ petition must be reversed.
[1044]*1044Each of the doctors who examined appellant believed that appellant’s two work-related accidents were responsible to some extent for his disability. Dr. Smiley, appellant’s treating physician from November 1975 through 1979, attributed 10 percent of appellant’s knee disability to the accidents. Dr. Trauner, who examined appellant in 1980, thought it “reasonable that 10% of his disability in his lower extremities [was] related to his working activities over the years and to the injuries reported. ” Dr. Katz, who also examined appellant in connection with his retirement application, attributed one-third of the disability to appellant’s preexisting conditions of disease and obesity and two-thirds to his work-related injuries. The daily stresses of his job also contributed to appellant’s disability, in Dr. Katz’ opinion. Dr. Katz explained at his deposition that he thought the injuries accelerated or worsened appellant’s arthritis and that the impact of such injuries might not be evident in X-rays for several years.
Dr. Trauner also expressed in his report the opinion that appellant “would be limited to sedentary activities because of his longstanding hip disability which is not in any way related to his industrial injuries as reported.” Dr. Trauner speculated that appellant’s hip problem was probably related to a condition existing since appellant’s childhood.
While appellant may eventually have been forced to retire because of hip problems, he consistently asserted, to his work supervisor and to doctors, that the reason he stopped working in October 1979 was that he could no longer tolerate the pain in his left knee.2 Dr.Trauner, who examined appellant in June 1980, eight months after appellant had ceased working for the county, was of the opinion that at that time arthritis in both appellant’s knees and hip was responsible for his disability and that 10 percent of the overall disability in appellant’s lower extremities as of June 1980 could reasonably be attributed to appellant’s working activities and to his two injuries. Dr. Smiley’s reports did not consider arthritis in appellant’s hip as a factor contributing to his overall disability. Dr. Katz attributed 10 percent of appellant’s disability to his hip condition and 80 to 90 percent to his knee problems. We conclude, therefore, that while arthritis in appellant’s hip may have been a factor contributing to appellant’s disability, it alone would not have forced him to stop work in October 1979.
Prior to the 1980 amendment of Government Code section 31720, it had been held that employment had to have more than an “infinitesimal and inconse[1045]*1045quential” relationship to the applicant’s incapacity, although it could comprise “a very small part of the disability. ” (DePuy v. Board of Retirement, supra, 87 Cal.App.3d at p. 398.) The DePuy
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Opinion
WHITE, P. J.
Appellant became unable to perform his duties as a mail clerk driver for the County of San Mateo in October 1979. He had applied for service-connected disability retirement benefits in January 1979. After a hearing on his application, the respondent board of retirement issued findings of fact, denied appellant’s application, and granted him nonservice-connected disability retirement. Appellant filed a petition for writ of mandate in superior court. The court denied the petition. Appellant contends on appeal that there was no substantial evidence to support the superior court’s decision. We agree and reverse the judgment below.
Before appellant began work for the County of San Mateo on December 11, 1972, he had had no complaint of pain in his left knee, although X-rays taken in February 1972 revealed osteoarthritis in both knees. On September 11, 1973, appellant twisted his left knee getting out of his delivery truck. Four years later, appellant again twisted his left knee in the same manner. Pain in his left knee finally forced him to retire in October 1979.
Appellant’s application for service-connected disability retirement benefits is governed by Government Code section 31720. The provision, as amended, requires an applicant to have been incapacitated as a result of injury or disease arising out of and in the course of employment. Such employment must have contributed substantially to the applicant’s incapacity.1
[1043]*1043“ ‘[Pjension legislation must be liberally construed and applied to the end that the beneficent results of such legislation may be achieved. Pension provisions in our law are founded upon sound public policy and with the objects of protecting, in a proper case, the pensioner and his dependents against economic insecurity. In order to confer the benefits intended, such legislation should be applied fairly and broadly.’” (Jorgensen v. Cranston (1962) 211 Cal.App.2d 292, 296 [27 Cal.Rptr. 297].) This principle has been recognized as well settled in California (Gorman v. Cranston (1966) 64 Cal.2d 441, 444 [50 Cal.Rptr. 533, 413 P.2d 133]) and has been cited in numerous cases involving the award of county employee retirement benefits. (Heaton v. Marin County Employees Retirement Bd. (1976) 63 Cal.App.3d 421,429 [133 Cal.Rptr. 809]; Gelman v. Board of Retirement (1978) 85 Cal.App.3d 92, 97 [149 Cal.Rptr. 225]; DePuy v. Board of Retirement (1978) 87 Cal.App.3d 392, 398 [150 Cal.Rptr. 791, 12 A.L.R.4th 1150].)
Both statutory and decisional law make clear that employment need not be the sole cause of an employee’s disability in order for an award of employment-connected disability retirement to be made. (Gov. Code, § 31720; Heaton v. Marin County Employees Retirement Bd., supra, 63 Cal.App.3d at pp. 428-429.) It has been held, based on reasoning parallel to that behind the principle in workers’ compensation law, that an employer takes his employee as he finds him, and therefore any acceleration or aggravation of a preexisting disability becomes a service-connected injury of that employment (see Kuntz v. Kern County Employees’ Retirement Assn. (1976) 64 Cal.App.3d 414, 421 [134 Cal.Rptr. 501]; Buckley v. Roche (1931) 214 Cal. 241, 245-246 [4 P.2d 929]), and that an applicant for a government retirement pension will be awarded service-connected benefits where he or she can show a material and traceable connection between disability and employment. (Gelman v. Board of Retirement, supra, 85 Cal.App.3d 92.)
In Gelman, the judgment of the trial court denying the applicant’s petition for writ of mandate was reversed. The Court of Appeal held that because the record conclusively established that the applicant’s employment as a social worker aggravated his preexisting mental illness, his disability arose out of and in the course ofhis employment as a matter of law. (Id., at p. 95.) Becausewe find that the record in the present case clearly shows that appellant’s two work-related injuries as well as the day-to-day stresses of his job made his employment a substantial cause ofhis disability, we hold that his disability arose out of and in the course ofhis employment as a matter of law. The trial court’s denial of his writ petition must be reversed.
[1044]*1044Each of the doctors who examined appellant believed that appellant’s two work-related accidents were responsible to some extent for his disability. Dr. Smiley, appellant’s treating physician from November 1975 through 1979, attributed 10 percent of appellant’s knee disability to the accidents. Dr. Trauner, who examined appellant in 1980, thought it “reasonable that 10% of his disability in his lower extremities [was] related to his working activities over the years and to the injuries reported. ” Dr. Katz, who also examined appellant in connection with his retirement application, attributed one-third of the disability to appellant’s preexisting conditions of disease and obesity and two-thirds to his work-related injuries. The daily stresses of his job also contributed to appellant’s disability, in Dr. Katz’ opinion. Dr. Katz explained at his deposition that he thought the injuries accelerated or worsened appellant’s arthritis and that the impact of such injuries might not be evident in X-rays for several years.
Dr. Trauner also expressed in his report the opinion that appellant “would be limited to sedentary activities because of his longstanding hip disability which is not in any way related to his industrial injuries as reported.” Dr. Trauner speculated that appellant’s hip problem was probably related to a condition existing since appellant’s childhood.
While appellant may eventually have been forced to retire because of hip problems, he consistently asserted, to his work supervisor and to doctors, that the reason he stopped working in October 1979 was that he could no longer tolerate the pain in his left knee.2 Dr.Trauner, who examined appellant in June 1980, eight months after appellant had ceased working for the county, was of the opinion that at that time arthritis in both appellant’s knees and hip was responsible for his disability and that 10 percent of the overall disability in appellant’s lower extremities as of June 1980 could reasonably be attributed to appellant’s working activities and to his two injuries. Dr. Smiley’s reports did not consider arthritis in appellant’s hip as a factor contributing to his overall disability. Dr. Katz attributed 10 percent of appellant’s disability to his hip condition and 80 to 90 percent to his knee problems. We conclude, therefore, that while arthritis in appellant’s hip may have been a factor contributing to appellant’s disability, it alone would not have forced him to stop work in October 1979.
Prior to the 1980 amendment of Government Code section 31720, it had been held that employment had to have more than an “infinitesimal and inconse[1045]*1045quential” relationship to the applicant’s incapacity, although it could comprise “a very small part of the disability. ” (DePuy v. Board of Retirement, supra, 87 Cal.App.3d at p. 398.) The DePuy court defined infinitesimal as “capable of being made arbitrarily close to zero, immeasurably or incalculably small,” and inconsequential as “not regularly flowing from the premises, irrelevant, in-consequent (lacking worth, significance or importance).” (Ibid.) The court stated that while it was not the intent of the Legislature that the board make awards where such a slight causal connection was demonstrated, the contribution of the applicant’s employment to his disability need only be “real and measurable” in order to support an award. (Id., at p. 399.) The medical testimony regarding the contribution of appellant’s two work-related accidents to his disability clearly established that it was more than “inconsequential,” placing it somewhere between 10 and 60 percent.3 We think the record shows the contribution of appellant’s employment to his disability meets the “small part” and “real and measurable” tests of DePuy.
Government Code section 31720 was amended in response to Heaton v. Marin County Employees Retirement Bd., supra, 63 Cal.App.3d 421, which held that an applicant is entitled to a service-connected disability if he or she is permanently unable to perform his or her job, and any part of the disability is job-connected. Following this decision, many counties urged change in existing law, fearing that the cost of county disability programs would grow to prohibitive levels. The final form of the amendment reflected a compromise between the bill’s supporters and labor representatives who strenuously opposed the bill. (Assem. File Analysis, Sen. Bill No. 1076, June 5, 1980.)
The Legislature did not promulgate any quantitative guidelines as to what it meant by “substantially” in its 1980 amendment of Government Code section 31720, and nothing in the history of the bill provides us with any indication of the intended meaning of this word. We turn, therefore, to the Restatement Second of Torts for assistance in defining “substantially.”
One of the requirements for “legal cause” set forth in section 431 of the Restatement Second of Torts is that negligent conduct be a “substantial factor” in bringing about harm. Comment a to section 431 distinguishes substantial cause from cause in a philosophical sense in the context of negligent conduct: “The word ‘substantial’ is used to denote the fact that the defendant’s conduct has such an effect in producing the harm as to lead reasonable men to regard it as a cause, using that word in the popular sense, in which there always lurks the [1046]*1046idea of responsibility, rather than in the so-called ‘philosophic sense,’ which includes every one of the great number of events without which any happening would not have occurred. Each of these events is a cause in the so-called ‘philosophic sense,’ yet the effect of many of them is so insignificant that no ordinary mind would think of them as causes.”
Using this definition of substantial in applying Government Code section 31720, as amended, does not abrogate the Legislature’s intent to restrict the Heaton court’s liberality in awarding service-connected disability benefits; a substantial contribution, thus defined, would not include any contribution of employment to disability, no matter how small and remote. At the same time, the use of this definition permits adherence to the well-settled principle, cited above, that pension legislation must be applied fairly and broadly.
We conclude that the medical opinions ,of Dr. Smiley, Dr. Trauner and especially Dr. Katz establish that appellant’s two work-related injuries and the stresses involved in performing his job are not “so insignificant that no ordinary mind would think of them as causes” of his disability. We think reasonable people would regard appellant’s employment as a cause of his disability, on this basis of the record in this case. We hold, therefore, that appellant’s employment contributed substantially to his disability and that the terms set forth in subdivision (a) of Government Code section 31720, as amended, are satisfied.
Judgment is reversed. The cause is remanded with directions to enter judgment for appellant in accordance with the views herein expressed.
Feinberg, J., concurred.