Selecting Biologically Plausible Endpoints for Superior Capsular Graft Studies

Abstract

A biologically plausible endpoint can be useful without being a validated measure of treatment benefit. This conceptual evidence synthesis develops an endpoint-selection framework for superior capsular graft research. A review of graft properties motivates connecting material and host-response questions with structural function and patient experience. The framework distinguishes measurement reliability, biological interpretation, prognostic association, and surrogate validity. It asks which observation would discriminate among competing explanations and how timing, sampling, and treatment selection affect that observation. Established shoulder outcomes and methodological frameworks support a prespecified outcome hierarchy and transparent evidence synthesis. No new biomarker, imaging threshold, clinical dataset, or pooled effect is evaluated. The contribution is a set of design decisions that can prevent a convenient laboratory or imaging measure from carrying a broader clinical claim than the evidence supports.