Metatarsophalangeal Joint
Pronunciation: met-uh-TAR-so-fuh-LAN-jee-ul
Also written as: MTPJ — Metatarsophalangeal Joint
The articulation between the head of a metatarsal bone and the base of the corresponding proximal phalanx, commonly abbreviated MTP or MTPJ in orthotic documentation.
Full Definition
The metatarsophalangeal joints (MTPJs) are the five condyloid joints connecting the forefoot metatarsals to the proximal phalanges of the toes. They permit flexion, extension, abduction, and adduction of the digits and play a critical role in the propulsive phase of gait. The first MTPJ is of particular clinical importance in orthotic practice, as pathologies such as hallux valgus and hallux rigidus directly affect its range of motion. Orthotic interventions targeting MTPJ function include Morton's extensions, metatarsal bars, and forefoot accommodations. Editors must ensure the correct abbreviation (MTPJ or MTP joint) is used consistently and the joint level is always specified (e.g., first MTPJ).
Usage
Usage note: Abbreviate as MTPJ or MTP joint; always specify the digit number (first, second, etc.) in clinical text. Do not confuse with the interphalangeal (IP) joint, which is located more distally.
In Context
- "Reduced range of motion at the first metatarsophalangeal joint was the primary indication for a carbon fibre Morton's extension orthosis." — Orthotic assessment documentation
- "Pressure mapping identified peak loading beneath the second MTPJ, prompting the addition of a metatarsal dome to the insole." — Clinical review letter