The three-layer system is a physiological response to how the body manages heat and moisture in cold, wet environments — not a marketing framework. Why age changes the calculation significantly, and what that means for a multi-generational expedition.

Why new parents, gamers, and fly fishermen all develop the same condition — the anatomy behind Mommy Thumb, Gamer's Thumb, and Fly Fisher's Wrist. Why cortisone works here when it doesn't for tennis elbow, and the treatment hierarchy that actually resolves it.

CMC arthritis vs. De Quervain's tenosynovitis — two conditions that hurt in the same neighborhood but require completely different treatment. The Finkelstein test and CMC grind test that tell you which one you're dealing with.

The OR/OR standard and the four-question framework for evaluating risk in any environment. Why predictable injuries are preventable injuries — and why a surgeon sees gear choices as clinical decisions made outside the hospital.

Why cortisone produces excellent short-term relief for tennis elbow and significantly worse one-year outcomes — and the conditions where injection is genuinely the right call. The inject vs. load distinction every patient deserves to understand.

The four-stage progression of ulnar nerve compression at the elbow — and when the window for conservative treatment starts closing. Includes the Finkelstein test and a stage-by-stage breakdown of what symptoms mean at each point.