interfragmentary lag screw

Full Definition

An interfragmentary lag screw is a fixation device designed to create compression between bone fragments by threading only into the far cortex while sliding freely through the near cortex. This technique is fundamental in orthopedic trauma surgery for achieving and maintaining fracture reduction. The screw head compresses the near fragment against the far fragment, promoting healing through direct bone contact. Editors should distinguish this from standard screws that engage both cortices equally.

Usage

Usage note: Specify screw diameter and placement angle when describing interfragmentary lag screw technique.

In Context

• "Two interfragmentary lag screws were placed perpendicular to the fracture line to achieve compression." — Surgical technique description
• "The interfragmentary lag screw provided excellent compression of the oblique fracture pattern." — Post-operative report