This сase is before us on appeal from a judgment of the Superior Court dismissing the plaintiffs’ complaint alleging medical malpractice against the defendants. A medical malpractice tribunal, convened pursuant to G. L. c. 231, § 60B, heard the plaintiffs’ claims of negligence and lack of informed consent brought against the defendant Doctors Birbiglia and Benedict, and found that the plaintiffs’ offer of proof was not sufficient to raise a question appropriate for judicial inquiry. The plaintiffs elected not to post a bond in accordance with G. L. c. 231, § 60B, and, as a result, a judge of the Superior Court dismissed their action. The plaintiffs appealed, and we transferred the case to this court on our own motion. We sustain the judgment of the Superior Court as to Dr. Birbiglia, but reverse the dismissal of the plaintiffs’ aсtion against Dr. Benedict.
As an initial matter, this appeal is properly before us since it is for the plaintiffs “to decide whether [they are] willing to assume the potentially fatal risks of pretrial review after failing or refusing to file a bond,” such risks to include that “of being out of court entirely if [their] claim of error by the tribunal is decided adversely.”
McMahon
v.
Glixman,
We summarize the material allegations contained in the plaintiffs’ offer of proof. The plaintiff, Robert M. Halley, a child approximately one and one half years old at the time of the сircumstances at issue, was admitted to St. Vincent Hospital in Worcester, on October 9, 1974. Following a routine immunization shot some weeks before, Robert’s parents noticed that he had developed a limp in his left leg, and they brought him to the hospital for examination. From *542 Robert’s admission until October 16, 1974, among the medical personnel evaluating Robert’s condition was the defendant Dr. Vincent P. Birbiglia, a neurologist. Dr. Birbiglia ordered a series of neurological tests to be performed during this period, all of which yielded negative or inconclusive results.
On or about October 17, Dr. Birbiglia determined that it would be advisable for Robert to receive an arteriogram, a procedure by which a catheter is passed into an artery and thereafter a dye is injected, which can then often be employed as a valuable tool in diagnosis. On appeal, the plaintiffs do not contest the appropriateness of this procedure. The arteriogram was performed on Robert by the defendant Dr. Karl J. Benedict, a radiologist, on the morning of October 18, and appeared to proceed without incident. However, after Robert returned to his room from the test, it was noticed that his lower right extremity was cool and that there was an absence of a pulse in the superficial femoral artery. This condition, induced by blood clots, steadily worsened and an operation that evening was unable to restore blood flow to Robert’s right leg. 3 A second operation was performed the next day, and this time blood flow was restored to the leg. However, the latter operation was too late to save Robert’s foot, which after extended observation was finally amputated on December 11, 1974.
The plaintiffs allege that both doctors failed to obtain an informed consent to the performance of the arteriogram, and that such failure amounts to medical malpractice. The plaintiffs’ affidavit states that neither defendant discussed the risks of the medical procedure with them and further сlaims that other hospital personnel (not named as defendants) assured them that the procedure was a safe one. Further, the plaintiffs’ expert, Dr. W. Robert Felix, Jr., ob *543 served that “ it is customary to disclose the risk associated with an arteriogram and this is especially true when the patient is less than a year and one half old because there are known risks, especially thrombosis [clotting], which accompany an arteriogram and the incidence of occurrence is greatly increased when the arteriogram is performed on a child.” 4
In response, the defendants argue that at that time neither of them had a duty to inform Robert’s parents of any significant risks involved in the contemplated test. The medical malpractice tribunal agreed, noting that it did not “think that the state of the law ... in Massaсhusetts . . . permits a conclusion of negligence merely from a failure to give informed consent.” The tribunal went on to “state for the record that, as a matter of law if it were otherwise, there would be adequate evidence in this case to show that there was not informed consent, that is to say, the parents’ affidavits would suffice to carry the case to the jury.”
*544
Although the doctrine of informed consеnt has existed in various forms since Justice (then Judge) Cardozo’s sweeping assertion of it in 1914,
Schloendorff
v.
Society of the N. Y. Hosp.,
The defendants argue that the Harnish decision should not be applied retroactively to events occurring in 1974, noting that by its terms the opinion does not state whether it is retroactive or merely prospective. If it is applied to the 1974 arteriogram, the defendants claim, this will penalize doctors for failing to obtain informed consent at a time when such consent was not yet legally required. We find no merit in these contentions.
In general, changes in the common law brought about by judicial decisions are given retroactive effect.
Tucker
v.
Badoian,
Such hypothetical reliance upon judicial precedent is especially unlikely in the instant case. Although the theory of informed consent was not explicitly recognized in Massachusetts until 1982, no Massachusetts court had rejected it prior to that time. On two occasions, we declined to express any opinion on the doctrine, since it was not squarely presented for decision. See
Superintendent of Belchertown State School
v.
Saikewicz,
In addition to focusing on reliance as a key factor in determining whether a decision should be given retroactive effect, our opinion in
Payton
highlighted another aspect of the determination: “whether the purposes of the rule will be served by retroactive application.”
Our decision to apply
Harnish
retroactively in this case is given further support by the fact that, indeрendent of the precise legal status of the informed consent doctrine in 1974, as a simple matter of negligence, disclosure of the material risks of an arteriogram administered to an infant was arguably good medical practice at that time. The plaintiffs’ expert expressed this conclusion in his affidavit, stating that “it was a deviation from good and acceptable practice for а physician to fail to advise parents of the risks and present to them the feasibility of alternatives” to the arteriogram. In
Brune
v.
Belinkoff,
Hence we rule that a physician’s duty of disclosure, as it is described in
Harnish
v.
Children’s Hosp. Medical Center,
Essentially, Harnish sets forth a dual-tiered requirement for recovery in informed consent actions: (1) the physician must have a duty to disclose the information at issue to the patient, and (2) the breach of that duty must be causally related to the patient’s injury. In turn, the first tier of the requirement contains several components: (a) a sufficiently closе doctor-patient relationship must exist; (b) the information subject to disclosure must be that which the doctor knows or reasonably should know; (c) the information must be of such a nature that the doctor should reasonably recognize that it is material to the patient’s decision; and (d) the doctor must fail to disclose the subject information to the patient. We will direct our attention initially to the question whether thе plaintiffs’ offer of proof established a sufficiently close doctor-patient relationship between either defendant and the patient.
In
Harnish,
which involved a failure to disclose the risks of a surgical procedure, we found that a sufficient doctor-patient relationship existed between the patient and two defendants, the surgeon and one of his two assistants.
As the hospital reports submitted in evidence indicate, Dr. Birbiglia’s relationship with the patient was that of a neurological consultant; he saw Robert intermittently during the period prior to the performance of the arteriogram. He was not the admitting or attending physician, he was not the physician who formаlly ordered the arteriogram
*549
(although he did recommend its performance),
8
he did not perform the arteriogram, and he was not one of the medical personnel who spoke with Robert’s parents and assured them of the safety of the test.
9
The plaintiffs’ expert offered no opinion as to why a duty to inform should be levied on Dr. Birbiglia, and the plaintiffs submitted no case precedent to support the extension of the informed consent doctrinе to an individual so tangentially involved in the performance of a medical procedure. Nor should Dr. Birbiglia be held responsible for any negligence or breach of a disclosure duty by Dr. Benedict; Dr. Benedict was not his agent nor under his direct control. See
Barrette
v.
Hight,
We do find, however, that the plaintiffs’ offer of proof was sufficient to establish such a relationship in the case of Dr. Benedict. Dr. Benedict not only performed the arteriogram but was also in a position to discuss the procedure with Robert’s parents and to highlight the risks associated with the test. Although the record is silent as to the nature of his contact with the parents prior to the performance of the arteriogram, he did discuss the procedure with them immediately after its completion. His situation was not unlike that of the surgeon in
Harnish,
as to whom we also found that a sufficiently close doctor-patient relationship existed. In a case involving injuries caused by radiation therapy, the risks of which had not been disclosed to the patient, the Supreme Court of Rhode Island arrived at a similar result
*550
by finding a duty on the part of the radiologists performing the procedure to disclose the attendant risks. In this regard, the Supreme Court of Rhode Island observed that “it is completely unjust and unwarranted to insulate [the defendant radiologists] from the responsibility relating to the disclosure or nondisclosure of the risks inherent in the use of deep radiation therapy and passing [sic] this obligation on to the chest specialist or the family physician.”
Wilkinson
v.
Vesey,
The plaintiffs’ offer of proof also appears to satisfy the other elements set out in Harnish which give rise to a duty to obtain an informed consent. The plaintiffs’ expert, Dr. Felix, stated in an affidavit that the possibility of thrombosis (i.e., clotting) in an arteriogram administered to an infant was a “known risk,” and Robert’s parents stated by affidavit that no disclosure of this risk was ever made. Dr. Felix аlso stated in his affidavit that “one of the known risks materialized, that is, a thrombosis, the existence of which was determined following the arteriogram and the correcting of which was attempted” by the later operations.
The plaintiffs’ offer of proof was sufficient to raise a question appropriate for judicial inquiry regarding Dr. Benedict’s failure to obtain an informed consent to the performanсe of an arteriogram. As to Dr. Benedict, the judgment of the Superior Court is reversed; as to Dr. Birbiglia, the Superior Court’s judgment dismissing the plaintiffs’ action is affirmed.
So ordered.
Notes
The medical malpractice tribunal found sufficient evidence to raise a legitimate question of liability regarding the surgeon performing this operation. Thus, there is no need to describe here in detail the plaintiffs’ allegations of negligence concerning the attempts to restore blood flow to Robert’s leg.
In his brief, counsel for Dr. Benedict attacks the credentials of Dr. Felix, placing emphasis upon the fact that Dr. Felix was not licensed to practice medicine in Massachusetts (although he was licensed in another State) at the time of the events at issue. Aside from the fact that such a challenge should have been made before thе medical malpractice tribunal rather than here for the first time, we feel that, even if it had been made previously, it should be accorded little weight. The standard for the admission of expert testimony before a medical malpractice tribunal is an extremely lenient one. As we stated in
Kapp
v.
Ballantine,
In what was essentially an unauthorized treatment case (involving the removal of a tumor from an anesthetized patient who had only consented to an examination) rather than one concerning the disclosure of risks prior to an operation, Justice Cardozo stated broadly that “[ejvery human being of adult years and sound mind has a right to determine what shall be done with his own body.”
See, e.g.,
Salgo
v.
Leland Stanford Jr. Univ. Bd. of Trustees,
For a different view, see
Scott
v.
Bradford,
The record is somewhat obscure on this point. While Dr. Birbiglia’s consultant’s notes contains the direction to “proceed” with the arteriogram, another unidentified doctor appears actually to have given the order to commence the procedure.
As noted earlier, with the exception of Dr. Benedict’s role in performing the arteriogram, references to other medical personnel in this discussion relate to individuals not named as defendants.
