lag screw

A heavy screw used for wood and having a usually hexagonal or square head.

[From lag (from its original use in securing barrel staves).]

American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

lag screw

(Building) a woodscrew with a square head

[from lag³; the screw was originally used to fasten barrel staves]

Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014

ThesaurusAntonymsRelated WordsSynonymsLegend:

Noun

lag screw - a heavy woodscrew with a square or hexagonal head that is driven in with a wrench

lag bolt

woodscrew - a metal screw that tapers to a point so that it can be driven into wood with a screwdriver

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References in periodicals archive

Since I didn't have a big enough nail handy for this one, I used an old lag screw. Just keep in mind you don't need or even want an extremely hard bolt.

Easy FIRING PIN FIX YOU BROKE YOUR GUN--WHAT NOW?

Advantages of the DCS plate include the relative technical ease of the procedure, as well as the ability to compress the nonunion site through the large proximal lag screw. Furthermore, at the author's institution, this plate is bent according to preoperative plans, allowing for improved contact throughout the lateral cortex after osteotomy completion [38].

Principles of Valgus Intertrochanteric Osteotomy (VITO) after Femoral Neck Nonunion

However, poor fixation and loss of reduction may occur as a result of unsatisfactory control of the proximal fragment during insertion of the lag screw [16].

Threading the Needle: Intrapelvic Displacement of a Femoral Neck Fracture through the Obturator Foramen

The Gamma nail is susceptible to fail at its weakest point, the lag screw implant interfaced [14,15,16,17,18]

EFFICACY OF PROXIMAL FEMORAL NAIL IN PROXIMAL FEMORAL FRACTURES

The ideal position of the proximal lag screw (PLS) within the femoral head to provide optimal stability to the implant-bone structure has not been studied sufficiently for cephalomedullary nails (9-11).

Numerical Optimization of the Position in Femoral Head of Proximal Locking Screws of Proximal Femoral Nail System; Biomechanical Study

The students were introduced to the concept of Interfragmentary lag screw fixation by Prof Zaki Idrees.

Trauma Workshop by Pakistan Orthopedic Association at Quetta

Lag screw osteosynthesis a new procedure for treating fractures of the man-dibular angle.

COMPARISON OF POST OPERATIVE COMPLICATIONS IN MANDIBULAR ANGLE FRACTURES TREATED BY SINGLE VERSUS TWO MINIPLATES

Exclusion Criteria: Criteria for exclusion included intracapsular femoral neck fractures; intertrochanteric fractures in which the head-neck fragment has connection with the trochanter(s), or has inferior cortical extension which can tether it to a distal fragment and prevent its spinning around the lag screw; and patients with advanced arthritis or with a pathological fracture.

Fixation of basicervical and related fractures using DHS with DRS

(3,4) In the majority of described cases of hip fracture related vascular complication, the injured vessel is either a branch of the profunda femoris artery due to penetration by a drill bit or screw, or an intra-pelvic vessel damaged by over-penetration of the lag screw guidewire.

Injury to the superior gluteal artery during intramedullary fixation of an atypical subtrochanteric stress fracture: a case report

The lag screw or blade with a length of 100 mm, a long barrel 135[degrees] side plate, and four conventional bicortical screws were inserted as a complete set of fixation.

A biomechanical study comparing helical blade with screw design for sliding hip fixations of unstable intertrochanteric fractures