FRIEDMAN, Judge.
AT&T (Employer) appeals from an order of the Workers’ Compensation Appeal Board (WCAB) which affirmed the decision of a workers’ compensation judge (WCJ) denying Employer’s petition for termination and granting Ruben Hernandez’ (Claimant) petition to review compensation benefits.
On April 8, 1989, while working for Employer as a building attendant, Claimant sustained a work-related injury when a large cabinet filled with computers fell on to his left hip, causing his right hip to strike the floor and trapping Claimant between the cabinet and the floor. (WCJ’s Findings of Fact, No. 1.) Claimant received workers’ compensation benefits pursuant to a notice of compensation payable issued by Employer on October 30, 1990;1 the notice of compensation payable described Claimant’s work injury as a “back sprain.” (WCJ’s Findings of Fact, No. 2; R.R. at 1A.)
On February 5, 1991, Employer filed a petition to terminate Claimant’s compensation benefits, alleging that Claimant had fully recovered from his work-related back sprain as of November 6, 1990, and that Claimant was able to return to his usual occupation without limitation but for his bilateral aseptic necrosis of the hips, a non-work-related pathology. (R.R. at 2A) Claimant filed an answer denying Employer’s allegations and averred continued total disability from his work-related injury. (R.R. at 3A.) Further, on October 20,1993, Claimant filed a petition to review compensation benefits (Petition), alleging that the notice of compensation payable did not properly reflect the traumatic injury to Claimant’s left and right hips which led to his bilateral aseptic necrosis.2 (R.R. at 16A.) Employer filed an answer denying these allegations. Employer’s termination petition was consolidated with Claimant’s Petition, arid hearings were held before a WCJ.3
[651]*651In support of its petition to terminate and to counter Claimant’s Petition, Employer presented the deposition testimony of three medical experts: Walter Scheuerman, M.D.;4 John Sbarbaro, Jr., M.D.;5 and Daniel Gross, M.D.,6 who all testified that Claimant had recovered from any work-related disability. Although Drs. Sbarbaro and Gross agreed that Claimant was suffering from bilateral aseptic necrosis of the hips, they opined that the condition was not causally related to Claimant’s work injury of April 8, 1989,
In opposition to Employer’s termination petition and in support of his Petition, Claimant presented the deposition testimony of Kenneth Izzo, M.D.,7 and Richard S. Glick, [652]*652D.O.,8 who both stated that Claimant remained disabled as a result of his work-related back injury as well as from his bilateral aseptic necrosis of the hips, which they also related to the trauma of Claimant’s April 8, 1989 work injury. In addition, Claimant testified on his own behalf,9 stating that he was unable to return to work because of continuing pain in his lower back and in both hips.
After consideration of the evidence, the WCJ made credibility determinations and resolved conflicts in the testimony. Specifically, the WCJ found the testimony of Drs. Izzo and Glick to be credible and persuasive, and the WCJ accepted their testimony over that of Drs. Scheuerman, Sbarbaro and Gross, where the opinions conflicted. Based on the credible medical evidence, the WCJ found that Claimant’s bilateral aseptic necrosis was caused by the trauma Claimant incurred as a result of his work-related injury of April 8, 1989 and, further, that Claimant has not fully recovered from that work injury. (WCJ’s [653]*653Findings of Fact, No. 12(a).) The WCJ also accepted Claimant’s testimony as credible and persuasive and, thus, found that Claimant remained symptomatic with both back and hip related problems. (WCJ’s Findings of Fact, No. 12(b).) Based on all of these findings, the WCJ denied Employer’s termination petition, concluding that Employer failed to meet its burden of establishing that Claimant had fully recovered from his April 8, 1989 work-related injury. The WCJ also concluded that Claimant had satisfied his burden under the Petition by establishing that his bilateral aseptic necrosis of the hips was related to the work injury of April 8, 1989. Accordingly, the WCJ granted Claimant’s Petition and amended the notice of compensation payable to include bilateral aseptic necrosis of the hips.10 The WCAB affirmed, and Employer now appeals to this court.11
Employer first contends that the WCAB erred in affirming the WCJ’s grant of Claimant’s Petition, arguing that the WCJ’s finding of a causal connection between Claimant’s bilateral aseptic necrosis and his April 8, 1989 work injury was based on incompetent medical evidence. We disagree.
To prevail on his Petition and, thus, receive benefits for his bilateral aseptic necrosis of the hips, Claimant had the . burden of proving a causal relationship between the disabling hip condition and the work -incident of April 8, 1989, and where, as here, that causal relationship is not obvious, unequivocal medical evidence is required to meet the burden. Cardyn v. Workmen’s Compensation Appeal Bd. (Heppenstall), 517 Pa. 98, 534 A.2d 1389 (1987). Medical evidence is sufficiently unequivocal if the medical witness, after providing a foundation, testifies that, in his professional opinion, certain facts exist, or that he believes or thinks certain facts exist, so long as the medical witness does not recant the opinion or belief first expressed. Philadelphia College of Osteopathic Medicine v. Workmen’s Compensation Appeal Bd. (Lucas), 77 Pa.Cmwlth. 202, 465 A.2d 132 (1983). However, where the foundation for the medical evidence is contrary to the established facts in the record, or is based on assumptions not in the record, the medical opinion is valueless and not competent. State Workmen’s Ins. Fund v. Workmen’s Compensation Appeal Bd. (Wagner), 677 A.2d 892 (Pa.Cmwlth.1996); Lookout Volunteer Fire Co. v. Workmen’s Compensation Appeal Bd., 53 Pa.Cmwlth. 528, 418 A.2d 802 (1980). Here, Employer challenges the testimony of both Dr. Glick and Dr. Izzo, claiming that neither meets the standard for competent evidence.
First, Employer claims that Dr. Gliek’s testimony is incompetent because he conceded that he had no idea what caused Claimant’s bilateral aseptic necrosis and that a history of alcoholism, if known, would have been a significant factor in determining the etiology of Claimant’s hip condition. However, in making this claim, Employer clearly misreads Dr. Glide’s testimony. Dr. Glick indicated that avascular aseptic necrosis can be caused either by trauma or by systemic disease, and, although he could not identify with certainty what led to Claimant’s condition, he nevertheless unequivocally related Claimant’s aseptic necrosis to Claimant’s April 8,1989 work injury. Indeed, Dr.
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FRIEDMAN, Judge.
AT&T (Employer) appeals from an order of the Workers’ Compensation Appeal Board (WCAB) which affirmed the decision of a workers’ compensation judge (WCJ) denying Employer’s petition for termination and granting Ruben Hernandez’ (Claimant) petition to review compensation benefits.
On April 8, 1989, while working for Employer as a building attendant, Claimant sustained a work-related injury when a large cabinet filled with computers fell on to his left hip, causing his right hip to strike the floor and trapping Claimant between the cabinet and the floor. (WCJ’s Findings of Fact, No. 1.) Claimant received workers’ compensation benefits pursuant to a notice of compensation payable issued by Employer on October 30, 1990;1 the notice of compensation payable described Claimant’s work injury as a “back sprain.” (WCJ’s Findings of Fact, No. 2; R.R. at 1A.)
On February 5, 1991, Employer filed a petition to terminate Claimant’s compensation benefits, alleging that Claimant had fully recovered from his work-related back sprain as of November 6, 1990, and that Claimant was able to return to his usual occupation without limitation but for his bilateral aseptic necrosis of the hips, a non-work-related pathology. (R.R. at 2A) Claimant filed an answer denying Employer’s allegations and averred continued total disability from his work-related injury. (R.R. at 3A.) Further, on October 20,1993, Claimant filed a petition to review compensation benefits (Petition), alleging that the notice of compensation payable did not properly reflect the traumatic injury to Claimant’s left and right hips which led to his bilateral aseptic necrosis.2 (R.R. at 16A.) Employer filed an answer denying these allegations. Employer’s termination petition was consolidated with Claimant’s Petition, arid hearings were held before a WCJ.3
[651]*651In support of its petition to terminate and to counter Claimant’s Petition, Employer presented the deposition testimony of three medical experts: Walter Scheuerman, M.D.;4 John Sbarbaro, Jr., M.D.;5 and Daniel Gross, M.D.,6 who all testified that Claimant had recovered from any work-related disability. Although Drs. Sbarbaro and Gross agreed that Claimant was suffering from bilateral aseptic necrosis of the hips, they opined that the condition was not causally related to Claimant’s work injury of April 8, 1989,
In opposition to Employer’s termination petition and in support of his Petition, Claimant presented the deposition testimony of Kenneth Izzo, M.D.,7 and Richard S. Glick, [652]*652D.O.,8 who both stated that Claimant remained disabled as a result of his work-related back injury as well as from his bilateral aseptic necrosis of the hips, which they also related to the trauma of Claimant’s April 8, 1989 work injury. In addition, Claimant testified on his own behalf,9 stating that he was unable to return to work because of continuing pain in his lower back and in both hips.
After consideration of the evidence, the WCJ made credibility determinations and resolved conflicts in the testimony. Specifically, the WCJ found the testimony of Drs. Izzo and Glick to be credible and persuasive, and the WCJ accepted their testimony over that of Drs. Scheuerman, Sbarbaro and Gross, where the opinions conflicted. Based on the credible medical evidence, the WCJ found that Claimant’s bilateral aseptic necrosis was caused by the trauma Claimant incurred as a result of his work-related injury of April 8, 1989 and, further, that Claimant has not fully recovered from that work injury. (WCJ’s [653]*653Findings of Fact, No. 12(a).) The WCJ also accepted Claimant’s testimony as credible and persuasive and, thus, found that Claimant remained symptomatic with both back and hip related problems. (WCJ’s Findings of Fact, No. 12(b).) Based on all of these findings, the WCJ denied Employer’s termination petition, concluding that Employer failed to meet its burden of establishing that Claimant had fully recovered from his April 8, 1989 work-related injury. The WCJ also concluded that Claimant had satisfied his burden under the Petition by establishing that his bilateral aseptic necrosis of the hips was related to the work injury of April 8, 1989. Accordingly, the WCJ granted Claimant’s Petition and amended the notice of compensation payable to include bilateral aseptic necrosis of the hips.10 The WCAB affirmed, and Employer now appeals to this court.11
Employer first contends that the WCAB erred in affirming the WCJ’s grant of Claimant’s Petition, arguing that the WCJ’s finding of a causal connection between Claimant’s bilateral aseptic necrosis and his April 8, 1989 work injury was based on incompetent medical evidence. We disagree.
To prevail on his Petition and, thus, receive benefits for his bilateral aseptic necrosis of the hips, Claimant had the . burden of proving a causal relationship between the disabling hip condition and the work -incident of April 8, 1989, and where, as here, that causal relationship is not obvious, unequivocal medical evidence is required to meet the burden. Cardyn v. Workmen’s Compensation Appeal Bd. (Heppenstall), 517 Pa. 98, 534 A.2d 1389 (1987). Medical evidence is sufficiently unequivocal if the medical witness, after providing a foundation, testifies that, in his professional opinion, certain facts exist, or that he believes or thinks certain facts exist, so long as the medical witness does not recant the opinion or belief first expressed. Philadelphia College of Osteopathic Medicine v. Workmen’s Compensation Appeal Bd. (Lucas), 77 Pa.Cmwlth. 202, 465 A.2d 132 (1983). However, where the foundation for the medical evidence is contrary to the established facts in the record, or is based on assumptions not in the record, the medical opinion is valueless and not competent. State Workmen’s Ins. Fund v. Workmen’s Compensation Appeal Bd. (Wagner), 677 A.2d 892 (Pa.Cmwlth.1996); Lookout Volunteer Fire Co. v. Workmen’s Compensation Appeal Bd., 53 Pa.Cmwlth. 528, 418 A.2d 802 (1980). Here, Employer challenges the testimony of both Dr. Glick and Dr. Izzo, claiming that neither meets the standard for competent evidence.
First, Employer claims that Dr. Gliek’s testimony is incompetent because he conceded that he had no idea what caused Claimant’s bilateral aseptic necrosis and that a history of alcoholism, if known, would have been a significant factor in determining the etiology of Claimant’s hip condition. However, in making this claim, Employer clearly misreads Dr. Glide’s testimony. Dr. Glick indicated that avascular aseptic necrosis can be caused either by trauma or by systemic disease, and, although he could not identify with certainty what led to Claimant’s condition, he nevertheless unequivocally related Claimant’s aseptic necrosis to Claimant’s April 8,1989 work injury. Indeed, Dr. Glick testified within a reasonable degree of medical certainty that Claimant’s symptomology resulted from the trauma that occurred during his work accident, either by causing it outright or by making a previously asymptomatic condition symptomatic. (R.R. at 196A-99A.) Further, Dr. Glick never recanted this expressed opinion. On cross-examination, Dr. Glick conceded that a history of alcohol abuse might be a factor in Claimant’s [654]*654aseptic necrosis, (R.R. at 225A-26A); however, even when he was asked to assume that Claimant had abused alcohol, Dr. Glick did not alter his belief that the trauma of Claimant’s work-related injury aggravated Claimant’s avascular aseptic necrosis. (R.R. at 253A-54A) Accordingly, the WCJ did not err in relying on Dr. Gliek’s medical testimony as substantial support for his finding of a causal relationship between Claimant’s April 8, 1989 work injury and his aseptic necrosis of the hips.
Employer also maintains that Dr. Izzo’s testimony is incompetent, noting that Dr. Izzo ruled out Claimant’s alcohol abuse as a cause of his bilateral aseptic necrosis based on a mistaken belief that Claimant had stopped abusing alcohol more than five or six years prior to his work injury and had not experienced any hip problems in the interim. (R.R. at 356A-58A.) Employer asserts that Dr. Izzo’s assumption was contrary to the established facts, namely Claimant’s credible testimony that he was drinking a fifth of Southern Comfort every week and a case of beer every day for a year between mid 1986 and October 1987, which was only one and a half years prior to his work injury. (R.R. at 126A-28A.) According to Employer, because Dr. Izzo emphasized the length of time between Claimant’s alcohol abuse and his work injury when he dismissed alcoholism as a cause of Claimant’s condition, Dr. Izzo’s opinion relating Claimant’s bilateral aseptic necrosis to the April 8, 1989 work incident is incompetent and could not provide support for the WCJ’s determination that Claimant’s aseptic necrosis was work-related. Even if we were to accept Employer’s argument,12 Employer ultimately could not prevail. As previously stated, Dr. Glick’s testimony alone provides substantial support for the WCJ’s finding of a causal relationship between Claimant’s aseptie necrosis and his work injury, and, thus, the WCAB did not err in affirming the grant of Claimant’s Petition.13
Next, Employer argues that the WCAB erred in affirming the WCJ’s denial of Employer’s termination petition because substantial, competent evidence in the record established that Claimant had fully recovered from his disabling, work-related back injury as of November 6, 1990, or at least as of August 10,1993. Again, we disagree.
In a termination proceeding, the employer bears the burden of proving by substantial evidence that all of the claimant’s work-related disability has ceased. Battiste v. Workmen’s Compensation Appeal Bd. (Fox Chase Cancer Center), 660 A.2d 253 (Pa.Cmwlth.1995). Where disability is present and the employer seeks to terminate benefits, the employer bears the burden of proving an independent cause for the disability or a lack of causal connection between the continuing disability and the work-related injury. Id. This burden is considerable because disability is presumed to continue until demonstrated otherwise. Id. Here, Employer clearly did not meet its burden.
In arguing to the contrary, Employer would have ús reject the credibility determinations made by the WCJ and accept the testimony of Employer’s medical experts [655]*655over that of Claimant and his medical experts. However, the WCJ, as fact-finder, is the sole arbiter of credibility, and where his findings are supported by substantial, competent evidence, we may not disturb them on appeal. Greenwich Collieries v. Workmen’s Compensation Appeal Bd. (Buck), 664 A.2d 703 (Pa.Cmwlth.1995). Here, the testimony of Dr. Glick, Dr. Izzo and Claimant, all credited by the WCJ, provides substantial support for the WCJ’s finding that Claimant has not fully recovered from his April 8, 1989 work injury and remains disabled with work-related back and hip problems. Therefore, the WCAB did not err in affirming the denial of Employer’s termination petition.
Accordingly, we affirm the WCAB’s order to the extent it denies Employer’s termination petition and grants Claimant benefits for his compensable hip condition. However, to the extent that the grant of benefits would amend Employer’s notice of compensation payable to include an injury to Claimant’s hips in addition to back sprain, we vacate the WCAB’s order.
ORDER
AND NOW, this 17th day of March, 1998, the order of the Workers’ Compensation Appeal Board, dated August 11,1997, is hereby affirmed to the extent that it denies AT&T’s termination petition and grants Ruben Hernandez’ petition in the nature of a claim petition seeking benefits for a compensable hip condition. The order is vacated to the extent that it would amend AT&T’s notice of compensation payable to include any additional injury.