Prioritize proximal interphalangeal joint extension, a cadaver study clarifying PIPJ neutral position and joint capsular behavior

We propose call to call the mid-flexion position (of 30º-40º flexion) the "neutral" position. This position maximizes capsular space volume, facilitating ligament shortening and arthrofibrosis. Extension minimizes volar capsularspace volume and may be essential for preventing flexion contractures. Clinically, immobilizing the proximal interphalangeal joint in extension with dorsal compression may help prevent contracture and reduce edema, while manual therapy should target the mid-flexion position to enhance joint mobilization.