Extended Reality (XR) technologies are transforming healthcare through immersive training, remote consultation, and patient rehabilitation. However, their extensive sensing capabilities and complex data pipelines introduce distinct security, privacy, and safety risks. Existing research lacks a unified quantitative framework for assessing and prioritizing these risks. We review 65 peer-reviewed studies on XR security and privacy published from 2017 to 2024, synthesizing a four-layer threat taxonomy consisting of Device, Network, User, and Cloud layers, along with a corresponding catalog of defenses. Building on this analysis, we introduce XR-PRISM, a six-factor weighted Privacy and Risk Impact Scoring Metric that integrates threat likelihood, system vulnerability, attack surface, safety impact, privacy impact, and control effectiveness into a single actionable risk score. Our analysis shows that more than 70% of the identified countermeasures lack standardized risk evaluation, while fewer than 15% of the documented attacks require a high level of expertise to execute. XR-PRISM provides researchers and practitioners with a transparent, data-driven method for comparing, prioritizing, and mitigating security and privacy risks in healthcare XR deployments.

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