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Talar neck fractures: anatomic considerations for posterior screw application
N A Ebraheim1, A O Mekhail, B J Salpietro
1Department of Orthopaedic Surgery, Medical College of Ohio, Toledo 43699-0008, USA.
Foot & Ankle International
|September 1, 1996
Summary
This study defines the safe bony window for posterior screw fixation in the talus, crucial for ankle fracture repair. Understanding talar neck morphology optimizes surgical screw placement and patient outcomes.
Area of Science:
- Orthopedic Surgery
- Anatomy
- Biomechanics
Background:
- Posterior screw placement in the talus is a common surgical technique.
- Understanding the precise anatomical boundaries and dimensions of the talar neck is critical for safe screw insertion.
Purpose of the Study:
- To define the bony window for posterior screw placement in the talus.
- To analyze the morphology of the talar neck relevant to screw fixation.
Main Methods:
- Examination of 50 dry tali to determine the bony window boundaries.
- Analysis of 12 cadaver specimens to evaluate the posterolateral approach.
- Measurement of talar neck thickness and surface angles.
Main Results:
- The bony window is defined by specific anatomical landmarks: lateral tubercle, fibular facet, trochlear surface, and calcaneal facet.
- The talar neck exhibits a minimum thickness 2 mm medial to the lateral border, increasing medially.
- The superior talar neck width averages 18.4 mm, with a 29.3-degree angle between superior and lateral surfaces.
Conclusions:
- The anatomical characteristics of the talar neck provide a defined bony window for posterior screw placement.
- Surgical planning should consider the talar neck's dimensions and the angle of screw insertion, especially under fluoroscopy.
- Screw diameter selection should be guided by the available bony window height to ensure fixation stability.