Human Restoration Theory: Bone Adaptation and Structural Timescales v0.1

Bone Adaptation and Structural Timescales v0.1 is the third Bridge Paper in the Human Restoration Theory (HRT) corpus. It examines bone as a living, site-specific, biologically regulated tissue that adapts across long structural timescales. The paper distinguishes local skeletal exposure from external task mechanics and separates bone density, geometry, microarchitecture, material-related properties, and turnover markers as non-interchangeable measures. The paper defines the evidence required for a bounded skeletal interface with HRT: a specified bone site, structural metric, local exposure estimate, biological context, observation interval, and separately measured functional consequence. It does not treat bone as a single load route, infer bone state from posture or movement alone, diagnose bone health or fracture risk, prescribe exercise, or claim that skeletal change proves restoration.