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2014, Number 3

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Rev Cubana Invest Bioméd 2014; 33 (3)

Comparison of pre and postsurgical stress over a hip joint with dysplastic sequels

Bueno-Palomeque FL, Cortés-Rodríguez CJ, García-Sarmiento CD

Language: Spanish
References: 16
Page:
PDF size: 515.20 Kb.


ABSTRACT

Introduction: the treatment of residual hip dysplasia in young persons and adults requires surgery. Bearing in mind the future biomechanical behavior of the joint could be a useful tool in the planning and evaluation of the most appropriate surgical procedure.
Objective: compare the distribution of pre- and postsurgical stresses over a hip joint with dysplastic sequels using the finite element method for its resolution.
Methods: use was made of a finite element model of a patient's hip joint with dysplastic sequels reconstructed from computerized axial tomography images, and a model of the joint relocation that simulated the surgical procedure performed. The maximum stress generated and the weight bearing area were estimated during the stance phase of the gait.
Results: the load on the treated joint was excessive due to the reduced joint coverage. Simulations on the postsurgical model revealed a 20.20% reduction in the maximum effort exerted on the femoral head at the point of greatest load during the gait (20% of the support stage), a 49% reduction in the contact pressure over the joint cartilage, and a 64% increase in the weight bearing area at the same point.
Conclusions: the study reveals very considerable postsurgical biomechanical improvement in the amount of load borne by the joint. On the other hand, it allows a better view of the patient's reality and contributes to taking the best treatment decisions.


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