Abstract
Good clinical practice guidelines are based on randomized controlled trials or clinical series; however, technical performance bias among surgical trials is under-assessed. The heterogeneity of technical performance within different treatment groups diminishes the level of evidence. Surgeon variability with different levels of experience-technical performance levels even after certification-influences surgical outcomes, especially in complex procedures. Technical performance quality correlates with the outcomes and costs and should be measured by image or video-photographic documentation of the surgeon's view field during the procedures. Such consecutive, completely documented, unedited observational data-in the form of intra-operative images and a complete set of eventual radiological images-improve the surgical series' homogeneity. Thereby, they might reflect reality and contribute towards making necessary changes for evidence-based surgery.
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