Quadrilateral Socket
Pronunciation: kwod-rih-LAT-er-ul
An older transfemoral prosthetic socket design with a four-sided brim in which the ischial tuberosity rests on a posterior shelf rather than being enclosed within the socket walls.
Full Definition
The quadrilateral socket was the dominant transfemoral socket design from the mid-twentieth century until the development of ischial containment designs in the 1980s. It features four distinct walls—anterior, posterior, medial, and lateral—with a flat posterior shelf that supports the ischial tuberosity externally. While largely superseded in contemporary practice, the quadrilateral socket remains in use in some clinical settings and is frequently referenced in historical and comparative literature. Editors working on rehabilitation medicine texts must be able to distinguish this term from 'ischial containment socket,' as the two represent different biomechanical philosophies.
Usage
Usage note: Distinguish from 'ischial containment socket' in all clinical and editorial contexts; the two are not synonymous and represent different eras of prosthetic design.
In Context
- "Earlier prosthetic fitting protocols routinely specified a quadrilateral socket, which has since been largely replaced by ischial containment designs." — Historical review article
- "The manuscript incorrectly described a quadrilateral socket as the current standard of care; this should be updated to reflect contemporary practice." — Peer-review editorial comment