Immobilisation splint for metacarpal fracture. Syndactyl 2nd and 3rd finger or 4th and 5th finger. Support and counter support on the palmar and dorsal side, removable and adjustable. Immobilisation of the metacarpophalangeal joint in intrinsic position (70° flexion). No threading, intuitive and painless installation. Adjustable according to damage and adjustable from 2nd to 5th metacarpal. Freedom of the interphalangeal joints: possibility to maintain grip. A unique orthosis for metacarpal injuries. Lightweight (only 61 grams) breathable.