Effect of the Starting Point of Half-Pin Insertion on the Insertional Torque of the Pin at the Tibia.
10.3349/ymj.2015.56.1.154
- Author:
Sung Jae KIM
1
;
Sung Hwan KIM
;
Young Hwan KIM
;
Yong Min CHUN
Author Information
1. Department of Orthopaedic Surgery, Arthroscopy and Joint Research Institute, Severance Hospital, Yonsei University College of Medicine, Seoul, Korea. min1201@hanmail.net
- Publication Type:Original Article ; Research Support, Non-U.S. Gov't
- Keywords:
Fracture;
tibia;
diaphysis;
external fixation
- MeSH:
Aged;
Aged, 80 and over;
*Bone Nails;
Bone Screws;
Diaphyses/radiography/surgery;
*External Fixators;
Female;
Humans;
Male;
Tibia/radiography/*surgery;
*Torque;
X-Ray Microtomography
- From:Yonsei Medical Journal
2015;56(1):154-158
- CountryRepublic of Korea
- Language:English
-
Abstract:
PURPOSE: The authors have observed a failure to achieve secure fixation in elderly patients when inserting a half-pin at the anteromedial surface of the tibia. The purpose of this study was to compare two methods for inserting a half-pin at tibia diaphysis in elderly patients. MATERIALS AND METHODS: Twenty cadaveric tibias were divided into Group C or V. A half-pin was inserted into the tibias of Group C via the conventional method, from the anteromedial surface to the interosseous border of the tibia diaphysis, and into the tibias of Group V via the vertical method, from the anterior border to the posterior surface at the same level. The maximum insertion torque was measured during the bicortical insertion with a torque driver. The thickness of the cortex was measured by micro-computed tomography. The relationship between the thickness of the cortex engaged and the insertion torque was investigated. RESULTS: The maximum insertion torque and the thickness of the cortex were significantly higher in Group V than Group C. Both groups exhibited a statistically significant linear correlation between torque and thickness by Spearman's rank correlation analysis. CONCLUSION: Half-pins inserted by the vertical method achieved purchase of more cortex than those inserted by the conventional method. Considering that cortical thickness and insertion torque in Group V were significantly greater than those in Group C, we suggest that the vertical method of half-pin insertion may be an alternative to the conventional method in elderly patients.
