Acta Orthop Traumato
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Acta Orthop Traumato · Jan 2015
A new small-animal model for the study of acquired heterotopic ossification after hip surgery.
Heterotopic ossification (HO)--the formation of bone in soft tissues--is a frequent problem after surgery of the hip and pelvis, but little is known about its underlying pathogenic mechanisms. It is vital to study the underlying pathogenesis in animal models to develop and evaluate new prophylactic regimens directed against HO. However, previously developed small-animal models for the study of HO imitate neither surgery nor trauma-mechanisms that potentially cause HO. Hence, the goal of this study was to develop a novel small-animal model imitating hip surgery that can reliably produce HO. ⋯ A rat model of hip/pelvic surgery that does not use exogenous osteogenic stimulus and can reliably produce HO was developed.
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Acta Orthop Traumato · Jan 2015
Modified tension band wiring technique for olecranon fractures: where and how should the K-wires be inserted to avoid articular penetration?
Articular penetration of K-wires is a possible complication of the modified tension band wiring technique. However, there is no clear information or evidence regarding the entry point or introduction angle for K-wires to avoid this complication. The aim of this experimental study was to evaluate the effect of varying K-wire insertion points and angles on the risk for articular penetration during modified tension band wiring for olecranon fractures. ⋯ When applying the modified tension band wiring technique to prevent articular penetration, K-wires should be inserted in the first 5 mm from dorsal cortex of the olecranon process at a maximum angle of 20°. Moreover, if the wires are required to be inserted more anteriorly because of the anatomical configuration of the fracture, they should be inserted at a shallow angle in the sagittal plane in relation to the proximal cortex of the ulna.
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The aim of the present study was to determine the knee joint line level by its distance to the adductor tubercle and the apex of the fibular head in the Turkish population. ⋯ There was a linear correlation between the femoral width and the adductor tubercle-joint line distance irrespective of any factors such as age, gender and height. Therefore, the adductor tubercle can be used as a reliable landmark to determine the joint line level for easy evaluation and measurement during surgery.
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Acta Orthop Traumato · Jan 2015
Comparative StudyPositional alterations of the Kambin's triangle and foraminal areas in the lumbosacral region.
The aim of this anatomical study was to compare the effects of the prone and lateral decubitus positions in endoscopic disc surgery on the Kambin's triangle (KT) and neural foramina zones in the lumbosacral region. ⋯ The KTA is wider in the lateral decubitus position than in the prone position at the levels of L4-L5 and L5-S1.
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Acta Orthop Traumato · Jan 2015
Biomechanical effect of medial cortical support and medial screw support on locking plate fixation in proximal humeral fractures with a medial gap: a finite element analysis.
This finite element analysis aimed to examine the effect of medial cortical support and medial screw support on loads at the implant-bone interface of locking plate fixation of proximal humeral fractures with a medial gap. ⋯ Placement of calcar screws combined with good medial cortical contact in varus in locking plate fixation of proximal humeral fractures with a medial gap may provide optimal stability for the fixation.