Anterior or posterior obliquity of the lag screw in the lateral view-Does it affect the sliding characteristics on unstable trochanteric fractures?

Si Young Park, Jin Park, Dong Joo Rhee, Han Kook Yoon, Kyu Hyun Yang

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

We investigated the sliding pattern characteristics of proximal fragment in 16 proximal femur models of 31-A2.1 type trochanteric fractures fixed with dynamic hip screw system under load. In eight models, the lag screw was inserted with an anterior-to-posterior vector within the neck and the head of femur (group 1). The other eight had a posterior-to-anterior vector (group 2). A force of 500 N (30 cycles) was applied to the fracture fragment-plate complex using the Instron 6022. No significant difference was noted in the sliding distance between the two groups (p = 0.17). However, the mean angle of rotation of the proximal fragment was twice as great in group 1 (16 ± 3.7°) than that in group 2 (8.1 ± 1.5°) (p < 0.001). In group 1, early eccentric contact in the anterior aspect of the intertrochanteric area caused internal rotation of the proximal fragment. Breakage of the anterior cortex of the lateral wall was noted in five out of the eight cases in group 1 and no case in group 2 (p = 0.026). Fracture of the anterior cortices significantly threatened the integrity of the lateral wall in group 1.

Original languageEnglish
Pages (from-to)785-791
Number of pages7
JournalInjury
Volume38
Issue number7
DOIs
Publication statusPublished - 2007 Jul 1
Externally publishedYes

Fingerprint

Hip Fractures
Femur Head
Femur Neck
Femur
Hip

Keywords

  • Dynamic hip screw
  • Femur
  • Sliding pattern
  • Trochanteric fracture

ASJC Scopus subject areas

  • Emergency Medicine
  • Orthopedics and Sports Medicine

Cite this

Anterior or posterior obliquity of the lag screw in the lateral view-Does it affect the sliding characteristics on unstable trochanteric fractures? / Park, Si Young; Park, Jin; Rhee, Dong Joo; Yoon, Han Kook; Yang, Kyu Hyun.

In: Injury, Vol. 38, No. 7, 01.07.2007, p. 785-791.

Research output: Contribution to journalArticle

@article{e5de20080ce34a7aa1389e7acc63627a,
title = "Anterior or posterior obliquity of the lag screw in the lateral view-Does it affect the sliding characteristics on unstable trochanteric fractures?",
abstract = "We investigated the sliding pattern characteristics of proximal fragment in 16 proximal femur models of 31-A2.1 type trochanteric fractures fixed with dynamic hip screw system under load. In eight models, the lag screw was inserted with an anterior-to-posterior vector within the neck and the head of femur (group 1). The other eight had a posterior-to-anterior vector (group 2). A force of 500 N (30 cycles) was applied to the fracture fragment-plate complex using the Instron 6022. No significant difference was noted in the sliding distance between the two groups (p = 0.17). However, the mean angle of rotation of the proximal fragment was twice as great in group 1 (16 ± 3.7°) than that in group 2 (8.1 ± 1.5°) (p < 0.001). In group 1, early eccentric contact in the anterior aspect of the intertrochanteric area caused internal rotation of the proximal fragment. Breakage of the anterior cortex of the lateral wall was noted in five out of the eight cases in group 1 and no case in group 2 (p = 0.026). Fracture of the anterior cortices significantly threatened the integrity of the lateral wall in group 1.",
keywords = "Dynamic hip screw, Femur, Sliding pattern, Trochanteric fracture",
author = "Park, {Si Young} and Jin Park and Rhee, {Dong Joo} and Yoon, {Han Kook} and Yang, {Kyu Hyun}",
year = "2007",
month = "7",
day = "1",
doi = "10.1016/j.injury.2007.03.010",
language = "English",
volume = "38",
pages = "785--791",
journal = "Injury",
issn = "0020-1383",
publisher = "Elsevier Limited",
number = "7",

}

TY - JOUR

T1 - Anterior or posterior obliquity of the lag screw in the lateral view-Does it affect the sliding characteristics on unstable trochanteric fractures?

AU - Park, Si Young

AU - Park, Jin

AU - Rhee, Dong Joo

AU - Yoon, Han Kook

AU - Yang, Kyu Hyun

PY - 2007/7/1

Y1 - 2007/7/1

N2 - We investigated the sliding pattern characteristics of proximal fragment in 16 proximal femur models of 31-A2.1 type trochanteric fractures fixed with dynamic hip screw system under load. In eight models, the lag screw was inserted with an anterior-to-posterior vector within the neck and the head of femur (group 1). The other eight had a posterior-to-anterior vector (group 2). A force of 500 N (30 cycles) was applied to the fracture fragment-plate complex using the Instron 6022. No significant difference was noted in the sliding distance between the two groups (p = 0.17). However, the mean angle of rotation of the proximal fragment was twice as great in group 1 (16 ± 3.7°) than that in group 2 (8.1 ± 1.5°) (p < 0.001). In group 1, early eccentric contact in the anterior aspect of the intertrochanteric area caused internal rotation of the proximal fragment. Breakage of the anterior cortex of the lateral wall was noted in five out of the eight cases in group 1 and no case in group 2 (p = 0.026). Fracture of the anterior cortices significantly threatened the integrity of the lateral wall in group 1.

AB - We investigated the sliding pattern characteristics of proximal fragment in 16 proximal femur models of 31-A2.1 type trochanteric fractures fixed with dynamic hip screw system under load. In eight models, the lag screw was inserted with an anterior-to-posterior vector within the neck and the head of femur (group 1). The other eight had a posterior-to-anterior vector (group 2). A force of 500 N (30 cycles) was applied to the fracture fragment-plate complex using the Instron 6022. No significant difference was noted in the sliding distance between the two groups (p = 0.17). However, the mean angle of rotation of the proximal fragment was twice as great in group 1 (16 ± 3.7°) than that in group 2 (8.1 ± 1.5°) (p < 0.001). In group 1, early eccentric contact in the anterior aspect of the intertrochanteric area caused internal rotation of the proximal fragment. Breakage of the anterior cortex of the lateral wall was noted in five out of the eight cases in group 1 and no case in group 2 (p = 0.026). Fracture of the anterior cortices significantly threatened the integrity of the lateral wall in group 1.

KW - Dynamic hip screw

KW - Femur

KW - Sliding pattern

KW - Trochanteric fracture

UR - http://www.scopus.com/inward/record.url?scp=34249943149&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=34249943149&partnerID=8YFLogxK

U2 - 10.1016/j.injury.2007.03.010

DO - 10.1016/j.injury.2007.03.010

M3 - Article

VL - 38

SP - 785

EP - 791

JO - Injury

JF - Injury

SN - 0020-1383

IS - 7

ER -