Chapter 25 Fundamentals of Spine Surgery
Patient Selection
The Spine Patient Outcome Research Trial (SPORT) highlights some of the difficulties in executing a randomized, multicentric trial.1–3 SPORT was the first comprehensive study to look at different ways of treating low back and leg pain and the effectiveness of those treatments. Even though this was a prospective, randomized trial, the amount of crossover between the surgical and nonsurgical arms ultimately rendered the analyses nonrandomized. Additionally, blinding was not possible in a surgical trial, which could have also introduced several confounders into the analyses.
The excellent design and timely execution of carotid endarterectomy studies such as the North American Symptomatic Carotid Endarterectomy Trial (NASCET) and the Asymptomatic Carotid Atherosclerosis Study (ACAS) provide a paradigm for the potential benefits of outcomes research.4,5 These studies clearly defined objective criteria for surgical treatment, based on risk and benefit ratios. Although outcome assessment is obviously more straightforward for carotid endarterectomy than spine surgery, the carotid endarterectomy trials nevertheless serve as a reminder of the powerful influence such trials can exert on surgical practice. These trials not only have established the safety and efficacy of the procedure itself, but also have provided unambiguous guidelines for patient selection. However, the suboptimal prospective study of extracranial-to-intracranial bypass for ischemic stroke, which concluded that surgical treatment was less effective than medical therapy, does illustrate some weaknesses of this type of study.6
Newer studies such as the Carotid Revascularization Endarterectomy versus Stenting Trial (CREST) and the Carotid Occlusion Surgery Study (COSS) are using the prospective, randomized study design in an attempt to generate level 1 data to guide evidence-based medicine practices.
Consent for Surgery
Informed Consent
Several studies have shown that patients often are unable to recall the content of the information that the physician conveyed during the session at which informed consent was supposedly obtained.7–9 Sometimes these scenarios are the basis for legal claims against unsuspecting physicians, who are accused of not informing the patient adequately of potential complications. Physicians can avoid these confrontations by carefully documenting their conversations with patients and their families in the medical record, indicating both the time and the date of the conversation as evidence that it occurred before any intervention. Note that this documentation should be in addition to written patient consent. However, legal repercussions aside, the demonstration that patients often do not remember information provided by physicians is certainly not a logical argument against the virtue of informed consent. There are many instances in life when one is unable to recall the reasons or motivations for making even the most important decisions.