Abstract：
:Inserting the distal locking screws is a challenging step of the intramedullary nailing procedures due to the nail deformation that makes the proximally mounted targeting systems ineffective. A pre-planning methodology is proposed, based on an analytical model of the nail-bone construct, to predict the nail deformation during surgery using orthogonal preoperative radiographs. Each of the femoral shaft and the nail was modeled as a curved tubular Euler-Bernoulli beam. The unknown positions and forces of the nail-bone interaction were found using a systematic trial and error approach, which minimized the total strain energy of the system while satisfying the force and geometrical constraints. The predictions of the model for the nail deformation were compared with the experimental results of five cadaver specimens in 15 test conditions. Relatively large displacements (up to 13 mm) were found for the distal hole in sagittal plane only. The model predictions were in close agreement with the experimental results, with a root mean square error of 1.2 mm. It was concluded that the proposed pre-planning methodology is promising for practical clinical use in intramedullary nailing operations, in order to provide the compensatory information that is required for tuning of proximally mounted targeting systems.
journal_name
Med Eng Physjournal_title
Medical engineering & physicsauthors
Mortazavi J,Farahmand F,Behzadipour S,Yeganeh Adoi
10.1016/j.medengphy.2019.09.012subject
Has Abstractpub_date
2019-12-01 00:00:00pages
172-179eissn
1350-4533issn
1873-4030pii
S1350-4533(19)30178-Xjournal_volume
74pub_type
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