OPINION
MATTHEWS, Justice.
In this medical malpractice case the trial court granted summary judgment in favor of the defendants based on the statute of limitations.1 We conclude that genuine issues of material fact exist as to when the cause of action accrued and whether defendant Michael J. Flannery, M.D., is estopped from relying on the statute of limitations. We therefore reverse.
FACTS2
On November 22,1983, Einar Peder-sen was injured in a two-car collision near Fairbanks. Pedersen’s aorta was severed in the accident. He was brought to Fairbanks Memorial Hospital where immediate corrective surgery was performed by Drs. Michael J. Flannery and William Kibbey. The severed ends of the aorta were clamped for a total of forty-four minutes in order to stop the flow of blood during reattachment. After the operation, Peder-sen’s legs were permanently paralyzed.
Pedersen filed suit against Flannery, Kibbey, and the other appellees on November 8, 1988, claiming that his paralysis was caused by medical malpractice. Specifically, he claimed that clamping his aorta for forty-four minutes kept blood from flowing to his spinal cord for too long, causing paralysis. He alleges: “Reasonably competent and experienced Vascular/Thoracic Surgeons are aware of this potential hazard and avoid clamping the aortic heart vessels in such circumstance[s] to less than 30 minutes or use a shunt to provide blood flow around the clamped area during the operative procedures.”
Following the operation Pedersen asked Dr. Flannery what had caused his paralysis. Dr. Flannery told him that “he wasn’t sure but that [it] could have been caused by [the] spinal cord swelling due to a blow to the spine ... or because of lack of blood flow to the legs.” Pedersen was transferred from Fairbanks Memorial Hospital to Providence Hospital in Anchorage in early December 1983. There he asked Dr. Emery what had caused his paralysis. Dr. Emery replied that “it was a combination of factors including blood loss from damaged aorta [and] swelling of the spinal cord.” Neither Dr. Flannery nor Dr. Emery gave an indication that the operation had caused Pedersen’s paralysis.
Pedersen’s wife, Gloria, also discussed the cause of Pedersen’s paralysis with Dr. Flannery. She states that Dr. Flannery
explained ... that the aorta was severed like a garden hose, and that he had to reattach the aorta, and that he had to work fast to accomplish this in 20 minutes, or damage to the spinal cord could occur. I took this to mean that he accomplished the operative procedures in twenty minutes. He did not say it actually took him 44 minutes to accomplish the procedure. He also said that despite his efforts, spinal cord damage could oc[906]*906cur, because of lack of blood, or bruising of the spinal cord, which he said had occurred. He also said the paralysis might not be permanent or total, and that only time would tell as to that.
She states that she discussed the operation with Pedersen but
it never occurred to us that Dr. Flannery or Kibbey had done anything wrong. Quite the contrary since Dr. Flannery had left us both with the impression that he had saved Einar’s life, and had accomplished the operative procedures just as he had planned them.
The Fairbanks Memorial Hospital records tell a somewhat different story. Dr. Flannery’s discharge summary states: “The biggest problem was that post[-]oper-atively the patient had an anterior spinal cord syndrome secondary to repair of the transected thoracic aorta.” The records also show that Pedersen’s aorta was clamped for approximately forty-four minutes. Although the records were available to Pedersen at the time he was discharged from Fairbanks Memorial Hospital on December 5, 1983, he did not obtain or review them then.
Pedersen retained an attorney, Bob Beco-novich, on or about December 30, 1983, initially for the purpose of defending him on the traffic ticket which he had been issued as a result of the accident. Eventually Beconovich was instructed to look into potential claims for Pedersen’s injury. In the process of doing so, Beconovich associated with another attorney, Paul Barrett. Potential claims against the other driver, and against the manufacturer of Pedersen’s vehicle, Ford Motor Company, were investigated but were found to be unsupportable. Sometime in the spring of 1985, Pedersen was referred to his current counsel, Michael Flanigan. Flanigan was interested in the potential claim against Ford Motor Company. He retained experts to investigate it and had Pedersen obtain his medical records from Fairbanks Memorial Hospital for review by these experts. The medical records were obtained in June of 1985. A few months later suit was filed against Ford.
During the suit against Ford, Flanigan obtained a set of medical records to produce for Ford and for review by Pedersen’s biomechanical experts. At this point, Flan-igan reviewed the medical records and states that he saw nothing in them which suggested a medical malpractice claim to him.
In the summer of 1988, one of Pedersen’s experts in the Ford case called Flanigan to tell him that medical malpractice may have occurred during the operation performed by Drs. Flannery and Kibbey. At about the same time, Flanigan received a similar report from Ford’s counsel, who had obtained similar information from an expert he had retained. Thereafter, on November 8, 1988, this suit was filed.
DISCUSSION
A. Statute of Limitations
The parties agree that this action is governed by AS 09.10.070 which requires an action to be brought within two years “after the cause of action had accrued.” AS 09.10.010. Ordinarily, a personal injury action “accrues” when the plaintiff is injured. However, Alaska, along with most other American jurisdictions, has adopted the discovery rule under which the statute does not begin to run until the claimant discovers, or reasonably should have discovered, the existence of the elements essential to his cause of action. Mine Safety Appliances Co. v. Stiles, 756 P.2d 288, 291 (Alaska 1988).
The discovery rule first gained general currency in medical malpractice cases where its need was felt most strongly when the medical injury did not manifest itself until after the statute of limitations had run. W. Keeton, D. Dobbs, R. Keeton & D. Owen, Prosser and Keeton on the Law of Torts § 30, at 166-67 (5th ed. 1984). The rule soon spread to malpractice cases brought against other professionals, e.g., Greater Area Inc. v. Bookman, 657 P.2d 828 (Alaska 1982) (attorney malpractice), and then to tort cases in general. E.g., Hanebuth v. Bell Helicopter Int’l, 694 P.2d 143, 144 (Alaska 1984) (“[I]t is the nature of the problems faced by plaintiff in discovering his injury and its cause, and [907]*907not the occupation of the defendant, that governs the applicability of the discovery rule.”) (quoting Stoleson v. United States, 629 F.2d 1265, 1269 (7th Cir.1980)).
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OPINION
MATTHEWS, Justice.
In this medical malpractice case the trial court granted summary judgment in favor of the defendants based on the statute of limitations.1 We conclude that genuine issues of material fact exist as to when the cause of action accrued and whether defendant Michael J. Flannery, M.D., is estopped from relying on the statute of limitations. We therefore reverse.
FACTS2
On November 22,1983, Einar Peder-sen was injured in a two-car collision near Fairbanks. Pedersen’s aorta was severed in the accident. He was brought to Fairbanks Memorial Hospital where immediate corrective surgery was performed by Drs. Michael J. Flannery and William Kibbey. The severed ends of the aorta were clamped for a total of forty-four minutes in order to stop the flow of blood during reattachment. After the operation, Peder-sen’s legs were permanently paralyzed.
Pedersen filed suit against Flannery, Kibbey, and the other appellees on November 8, 1988, claiming that his paralysis was caused by medical malpractice. Specifically, he claimed that clamping his aorta for forty-four minutes kept blood from flowing to his spinal cord for too long, causing paralysis. He alleges: “Reasonably competent and experienced Vascular/Thoracic Surgeons are aware of this potential hazard and avoid clamping the aortic heart vessels in such circumstance[s] to less than 30 minutes or use a shunt to provide blood flow around the clamped area during the operative procedures.”
Following the operation Pedersen asked Dr. Flannery what had caused his paralysis. Dr. Flannery told him that “he wasn’t sure but that [it] could have been caused by [the] spinal cord swelling due to a blow to the spine ... or because of lack of blood flow to the legs.” Pedersen was transferred from Fairbanks Memorial Hospital to Providence Hospital in Anchorage in early December 1983. There he asked Dr. Emery what had caused his paralysis. Dr. Emery replied that “it was a combination of factors including blood loss from damaged aorta [and] swelling of the spinal cord.” Neither Dr. Flannery nor Dr. Emery gave an indication that the operation had caused Pedersen’s paralysis.
Pedersen’s wife, Gloria, also discussed the cause of Pedersen’s paralysis with Dr. Flannery. She states that Dr. Flannery
explained ... that the aorta was severed like a garden hose, and that he had to reattach the aorta, and that he had to work fast to accomplish this in 20 minutes, or damage to the spinal cord could occur. I took this to mean that he accomplished the operative procedures in twenty minutes. He did not say it actually took him 44 minutes to accomplish the procedure. He also said that despite his efforts, spinal cord damage could oc[906]*906cur, because of lack of blood, or bruising of the spinal cord, which he said had occurred. He also said the paralysis might not be permanent or total, and that only time would tell as to that.
She states that she discussed the operation with Pedersen but
it never occurred to us that Dr. Flannery or Kibbey had done anything wrong. Quite the contrary since Dr. Flannery had left us both with the impression that he had saved Einar’s life, and had accomplished the operative procedures just as he had planned them.
The Fairbanks Memorial Hospital records tell a somewhat different story. Dr. Flannery’s discharge summary states: “The biggest problem was that post[-]oper-atively the patient had an anterior spinal cord syndrome secondary to repair of the transected thoracic aorta.” The records also show that Pedersen’s aorta was clamped for approximately forty-four minutes. Although the records were available to Pedersen at the time he was discharged from Fairbanks Memorial Hospital on December 5, 1983, he did not obtain or review them then.
Pedersen retained an attorney, Bob Beco-novich, on or about December 30, 1983, initially for the purpose of defending him on the traffic ticket which he had been issued as a result of the accident. Eventually Beconovich was instructed to look into potential claims for Pedersen’s injury. In the process of doing so, Beconovich associated with another attorney, Paul Barrett. Potential claims against the other driver, and against the manufacturer of Pedersen’s vehicle, Ford Motor Company, were investigated but were found to be unsupportable. Sometime in the spring of 1985, Pedersen was referred to his current counsel, Michael Flanigan. Flanigan was interested in the potential claim against Ford Motor Company. He retained experts to investigate it and had Pedersen obtain his medical records from Fairbanks Memorial Hospital for review by these experts. The medical records were obtained in June of 1985. A few months later suit was filed against Ford.
During the suit against Ford, Flanigan obtained a set of medical records to produce for Ford and for review by Pedersen’s biomechanical experts. At this point, Flan-igan reviewed the medical records and states that he saw nothing in them which suggested a medical malpractice claim to him.
In the summer of 1988, one of Pedersen’s experts in the Ford case called Flanigan to tell him that medical malpractice may have occurred during the operation performed by Drs. Flannery and Kibbey. At about the same time, Flanigan received a similar report from Ford’s counsel, who had obtained similar information from an expert he had retained. Thereafter, on November 8, 1988, this suit was filed.
DISCUSSION
A. Statute of Limitations
The parties agree that this action is governed by AS 09.10.070 which requires an action to be brought within two years “after the cause of action had accrued.” AS 09.10.010. Ordinarily, a personal injury action “accrues” when the plaintiff is injured. However, Alaska, along with most other American jurisdictions, has adopted the discovery rule under which the statute does not begin to run until the claimant discovers, or reasonably should have discovered, the existence of the elements essential to his cause of action. Mine Safety Appliances Co. v. Stiles, 756 P.2d 288, 291 (Alaska 1988).
The discovery rule first gained general currency in medical malpractice cases where its need was felt most strongly when the medical injury did not manifest itself until after the statute of limitations had run. W. Keeton, D. Dobbs, R. Keeton & D. Owen, Prosser and Keeton on the Law of Torts § 30, at 166-67 (5th ed. 1984). The rule soon spread to malpractice cases brought against other professionals, e.g., Greater Area Inc. v. Bookman, 657 P.2d 828 (Alaska 1982) (attorney malpractice), and then to tort cases in general. E.g., Hanebuth v. Bell Helicopter Int’l, 694 P.2d 143, 144 (Alaska 1984) (“[I]t is the nature of the problems faced by plaintiff in discovering his injury and its cause, and [907]*907not the occupation of the defendant, that governs the applicability of the discovery rule.”) (quoting Stoleson v. United States, 629 F.2d 1265, 1269 (7th Cir.1980)).
Although the need for the discovery rule is most clear in cases where the plaintiff’s injury is undiscovered and reasonably undiscoverable within two years after it was caused, it also applies to cases where the injury is known but its cause is unknown and reasonable diligence would not lead to its discovery. Hanebuth, 694 P.2d at 143 (helicopter crash wreckage not discovered until eight years after accident).
The formulation of the discovery rule which we typically employ, namely that a cause of action does not accrue until a plaintiff “discovers, or reasonably should discover, the existence of all the elements of his cause of action,” State, Dep’t of Corrections v. Welch, 805 P.2d 979, 982 (Alaska 1991), is broad enough to cover other undiscovered and reasonably undis-coverable elements such as whether the cause of the injury was tortious.3 Peder-sen, in the present case, argues that he did not know, and had no reason to know, either that the operation was the cause of his paralysis or that the operation was negligently performed.
The purpose of statutes of limitations is to eliminate the injustice which may result from the litigation of stale claims. Johnson v. City of Fairbanks, 583 P.2d 181, 187 (Alaska 1978). Statutes of limitations should be capable of application without engendering extensive litigation before the case on the merits is litigated. Thus, in theory, the statutes of limitations should begin to run on the occurrence of a definite event.
Application of the discovery rule, however, is dependent on facts that are often unclear. When a plaintiff first learned of an injury or its cause is a fact which may sometimes be in dispute. When a plaintiff first should have learned of an injury or its cause is frequently debatable. See Welch, 805 P.2d at 982.4
Reasonable minds may differ as to whether Pedersen should have discovered that the operation was probably the cause of his paralysis prior to two years before he filed suit on November 8, 1988. The statement in Pedersen’s hospital records that he suffered from “anterior spinal cord syndrome secondary to repair of transacted thoracic aorta” is a statement that his paralysis was caused by the operation. However, the ordinary person might not equate “anterior spinal cord syndrome” with paralysis or understand “secondary” to mean “resulting from.” Pedersen submitted an affidavit authored by Marshall Eaton, M.D. Dr. Eaton states, based in part on the hospital records, that “there would have been every reason for Mr. and Mrs. Peder-sen and their attorney to have been led to believe that Mr. Pedersen’s paraparesis was due to the accident itself causing Mr. Pedersen’s aorta to be transected.”
It is hard to charge Pedersen personally with any lack of diligence. He promptly inquired of Drs. Flannery and Emery as to the cause of the paralysis and was not told that the operation was' the cause. Further, he hired lawyers in a timely fashion to investigate possible claims against those who may have caused his paralysis. It is possible that his lawyers were negligent in failing to review his medical records to look for medical malpractice.5 However, as the record now [908]*908stands, we are unable to conclude as a matter of law that this is the case.
Under the discovery rule, the cause of action accrues when the plaintiff has information sufficient to alert a reasonable person to the fact that he has a potential cause of action. At that point, he should begin an inquiry to protect his or her rights and he is “deemed to have notice of all facts which reasonable inquiry would disclose.” Mine Safety, 756 P.2d at 292 (quoting Russell v. Municipality of Anchorage, 743 P.2d 372, 376 (Alaska 1987)); Welch, 805 P.2d at 982. If, however, a reasonable inquiry would not be immediately productive, the cause of action nonetheless accrues if, within the statutory period, the essential elements may reasonably be discovered. Palmer v. Borg-Warner, 818 P.2d 632, 638 (Alaska 1990).
There is a difference between asking whether a reasonable inquiry would have produced knowledge, and whether a plaintiff’s particular inquiry — which was unproductive — was reasonable. Putting the question in the abstract tends to place the focus on an ideal inquiry, whereas in reality there may have been several possible reasonable courses of inquiry, some of which would be productive and some of which would not be productive. Where the plaintiff actually attempts an inquiry, the fairer question in our view, is to ask whether his inquiry was reasonable. Where there is no attempt, however, there is no choice but to put the question in the abstract.6
In the present case, Pedersen knew that he became paralyzed following a serious automobile accident which resulted in major surgery. This knowledge was enough to alert a reasonable person of a potential cause of action and thus triggered a duty to begin an inquiry. Pedersen did initiate an inquiry by talking to his physicians concerning the cause of his paralysis, and subsequently hiring counsel. This inquiry was, however, unavailing until more than two years after the surgery. The main question in this case is whether Ped-ersen’s inquiry was reasonable. If it was, the statute of limitations should not accrue until he received actual knowledge of the cause of his paralysis or he received new information which would prompt a reasonable person to inquire further. If his inquiry was not reasonable, the cause of action should accrue at the inquiry notice point unless a reasonable inquiry would not have been productive within the statutory period. These are genuine issues of material fact which must be resolved at an evidentiary hearing.
B. Estoppel
There are also genuine issues of material fact concerning Pedersen’s claim that Dr. Flannery is estopped from relying on the statute of limitations. The elements of an estoppel are a misrepresentation, actually and reasonably relied upon:
Establishment of estoppel generally requires the party seeking to assert it to show “that the other party made some misrepresentation, or false statement, or acted fraudulently, and that he reasonably relied on such acts or representations ... and due to such reliance did not institute suit timely.” Although “there can be circumstances where an inaction or silence combined with acts or representations can give rise to an appropriate situation calling for the application of the estoppel doctrine,” ... a plaintiff generally cannot evoke estoppel unless he has exercised due diligence in attempting to uncover the concealed facts.
Russell v. Municipality of Anchorage, 743 P.2d 372, 376 (Alaska 1987) (quoting Groseth v. Ness, 421 P.2d 624, 632 n. 23 (Alaska 1966)).
In order to establish a right to equitable estoppel under Alaska law, a plaintiff must produce evidence of fraudulent con[909]*909duct upon which it reasonably relied when forebearing from suit.
Gudenau & Co., Inc. v. Sweeney Ins., Inc., 736 P.2d 763, 769 (Alaska 1987). An affirmative misrepresentation is not always necessary to establish estoppel. As we have observed, “[t]he settled rule is that the mere failure by a person to disclose a fact concerning a cause of action which arises against him does not suffice to toll the statute unless the defendant owed a duty of disclosure.” Russell, 743 P.2d at 376.
Pedersen claims that Dr. Flannery misrepresented the true cause of his paralysis. To support this, Pedersen points to Dr. Flannery’s response that “he wasn’t sure but [Pedersen’s paralysis] could have been caused by [Pedersen’s] spinal cord swelling due to a blow to the spine or because of a lack of blood flow to the legs.” This contrasts with Dr. Flannery’s report in Pedersen’s medical records which states “[a]nterior spinal cord syndrome secondary to repair of transected thoracic aorta.”
In our view, Dr. Flannery’s statement to Pedersen is on the borderline of what one would normally consider a misrepresentation. In any case, it omits important information. In the context of a physician-patient relationship, Dr. Flannery had a duty to disclose the fact that the operative procedures were a cause of Ped-ersen’s paralysis. The physician-patient relationship is one of trust. Because the patient lacks the physician’s expertise, the patient must rely on the physician for virtually all information about the patient’s treatment and health. A physician therefore undertakes, not only to treat a patient physically, but also to respond fully to a patient’s inquiry about his treatment, i.e., to tell the patient everything that a reasonable person would want to know about the treatment. See Carter v. Hoblit, 755 P.2d 1084, 1086 (Alaska 1988) (“Fraud can be established by silence or non-disclosure when a fiduciary relationship exists between the parties.... The fiduciary has a duty to fully disclose information which might affect the other person’s rights and influence his action.”); Greater Area Inc. v. Bookman, 657 P.2d 828, 830 (Alaska 1982) (“The duty of a fiduciary embraces the obligation to render a full and fair disclosure to the beneficiary of all facts which materially affect his rights and interests.”). Thus, when Pedersen asked Dr. Flannery what had caused his paralysis, it was not enough to say he wasn’t sure but it could have been a blow to the spine or loss of blood. A reasonable person in Ped-ersen’s position would want to know that the operation was a cause.7
Dr. Flannery therefore had a duty to disclose to Pedersen the fact that the length of time his aorta was cross-clamped was a cause of his paralysis. His failure to make a full disclosure satisfies the first requirement in the equitable estoppel analysis.8
The appellees claim that Dr. Flannery subsequently cured his misrepresentation by making a full disclosure of the cause of Pedersen’s paralysis in the medical records. In our view this point goes to the reasonableness of Pedersen’s reliance on Dr. [910]*910Flannery’s misrepresentations, the second requirement in the equitable estoppel analysis, and is a question of fact. It is closely related to the question which must be answered concerning application of the discovery rule: whether Pedersen's actions in inquiring as to the cause of his injury were reasonable.9
The mere fact that the cause of Peder-sen’s paralysis would have been apparent upon an informed reading of his medical records does not necessarily mean that Pedersen’s reliance on the misrepresentations of Dr. Flannery was unreasonable. Similar fact situations have arisen in other jurisdictions where a provider of medical services has made a misrepresentation which was relied on by a plaintiff, but was contradicted by medical records. Courts have not held that the fact that the true state of affairs appeared in the medical records necessarily precluded an estoppel. Nutty v. Jewish Hosp., 571 F.Supp. 1050, 1054 (S.D.Ill.1983); Almengor v. Dade County, 359 So.2d 892, 894 (Fla.App.1978); Krueger v. St. Joseph’s Hosp., 305 N.W.2d 18, 20-21, 25 (N.D.1981); cf. Witherell v. Weimer, 85 Ill.2d 146, 52 Ill.Dec. 6, 10-12, 421 N.E.2d 869, 874-76 (1981) (plaintiff reasonably should have known that product prescribed by doctors was causing leg problems, nonetheless, plaintiff should have the chance to prove estoppel), aff'd, 118 Ill.2d 321, 113 Ill.Dec. 259, 263-64, 515 N.E.2d 68, 72-73 (1987).
REVERSED and REMANDED.