header advert
Results 1 - 3 of 3
Results per page:
Bone & Joint Research
Vol. 3, Issue 5 | Pages 139 - 145
1 May 2014
Symmetry analysis of talus bone
Islam K Dobbe A Komeili A Duke K El-Rich M Dhillon S Adeeb S Jomha NM
Full Access
View article Download PDF

Objective

The main object of this study was to use a geometric morphometric approach to quantify the left-right symmetry of talus bones.

Methods

Analysis was carried out using CT scan images of 11 pairs of intact tali. Two important geometric parameters, volume and surface area, were quantified for left and right talus bones. The geometric shape variations between the right and left talus bones were also measured using deviation analysis. Furthermore, location of asymmetry in the geometric shapes were identified.

Results

Numerical results showed that talus bones are bilaterally symmetrical in nature, and the difference between the surface area of the left and right talus bones was less than 7.5%. Similarly, the difference in the volume of both bones was less than 7.5%. Results of the three-dimensional (3D) deviation analyses demonstrated the mean deviation between left and right talus bones were in the range of -0.74 mm to 0.62 mm. It was observed that in eight of 11 subjects, the deviation in symmetry occurred in regions that are clinically less important during talus surgery.

Orthopaedic Proceedings
Vol. 94-B, Issue SUPP_XXXVIII | Pages 193 - 193
1 Sep 2012
PROXIMAL HUMERUS FRACTURE FIXATION: LOCKING PLATE CONSTRUCT +/− INTRAMEDULLARY FIBULAR ALLOGRAFT
Chow RM Begum F Beaupre L Carey JP Adeeb S Bouliane M
Full Access
View article

Purpose

Locking plate constructs for proximal humerus fractures can fail due to varus collapse, especially in the presence of osteoporosis and comminution of the medial cortex. Augmentation using a fibular allograft as an intramedullary bone peg may strengthen fixation preventing varus collapse. This study compared the ability of the augmented locking plate construct to withstand repetitive varus stresses relative to the non-augmented construct in cadaveric specimens.

Method

Proximal humerus fractures with medial comminution were simulated by performing wedge-shaped osteotomies at the surgical neck in cadaveric specimens. For each cadaver (n=8), one humeral fracture was fixated with the locking plate construct alone and the other with the locking plate construct plus ipsilateral fibular autograft augmentation. The humeral head was immobilized and a repetitive, medially-directed load was applied to the humeral shaft until failure (significant construct loosening or humeral head screw pull-out).

Orthopaedic Proceedings
Vol. 93-B, Issue SUPP_III | Pages 252 - 252
1 Jul 2011
45. BIOMECHANICAL ANALYSIS OF PROXIMAL HUMERAL FIXATION USING LOCKING PLATE FIXATION WITH AN INTRAMEDULLARY FIBULAR ALLOGRAFT
Mathison C Chaudhary R Beaupré L Joseph T Adeeb S Bouliane M
Full Access
View article

Purpose: The purpose of this study is to compare two fixation methods for surgical neck proximal humeral fractures with medial calcar comminution:

locking plate fixation alone and

locking plate fixation with intramedullary allograft fibular bone peg augmentation.

Method: Eight embalmed pairs of cadaveric specimens were utilized in this study. Dual energy X-ray absorptiometry (DXA) scans were initially performed to determine the bone density of the specimens. Surgical neck proximal humerus fractures were simulated in these specimens by creating a 1-centimeter wedge-shaped osteotomy at the level of the surgical neck to simulate medial calcar fracture comminution. Each pair of specimens had one arm randomly repaired with locking plate fixation, and the other arm repaired with locking plate fixation augmented with an intramedullary fibular autograft bone peg. The constructs were tested in bending to determine the failure loads, and initial stiffness using Digital Imaging Correlation (DIC) technology. The moment created by the rotator cuff was replicated by fixating the humeral head, and applying a point load to the distal humerus. A load was applied with a displacement rate of 4 mm/min, and was stopped approximately every 5 lbs to take a picture and record the load. This process was continued until failure of the specimens was obtained.

Results: The intramedullary bone peg autograft increased the failure load of the constructs by 1.57±0.59 times (p = 0.026). Initial stiffness of the construct was also increased 3.13±2.10 times (p = 0.0079) with use of the bone peg.

Conclusion: The stronger and stiffer construct provided by the addition of an intramedullary fibular allograft bone peg to locking plate fixation may help maintain reduction, and reduce the risk of fixation failure in surgical neck proximal humerus fractures with medial comminution.