apophysis
Pronunciation: uh-POF-ih-sis
A secondary ossification center that serves as an attachment site for tendons or ligaments, not contributing to bone length.
Full Definition
An apophysis is a type of secondary ossification center that appears during adolescence and serves as an attachment point for muscles, tendons, or ligaments. Unlike epiphyses, apophyses do not contribute to longitudinal bone growth. Common locations include the iliac crest, ischial tuberosity, and various tubercles and trochanters. Apophyseal injuries are frequent in adolescent athletes due to repetitive stress during periods of rapid growth, leading to conditions like apophysitis or avulsion fractures.
Usage
Usage note: Distinguish clearly from epiphysis in documentation; apophyses do not affect longitudinal growth.
In Context
- "The adolescent athlete sustained an avulsion fracture of the anterior superior iliac spine apophysis." — Sports medicine evaluation
- "MRI showed apophysitis of the ischial tuberosity consistent with repetitive hamstring strain." — Imaging interpretation