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ISSN 2007-087X (Print)
Órgano Oficial de la Sociedad Mexicana de Ortopedia Pediátrica

2014, Number 1

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Rev Mex Ortop Ped 2014; 16 (1)

Biomechanical analysis of surface contact pressures after iliac osteotomy for correction of acetabular dysplasia

Ayala RD, Castañeda LP

Language: Spanish
References: 19
Page: 20-25
PDF size: 232.61 Kb.


ABSTRACT

Background: Acetabular dysplasia is the most common cause of secondary osteoarthritis, the increase in surface contact pressure is the predisposing factor which is why many osteotomies have been developed for the correction of the dysplasia. The theory is that the osteotomy will reduce the surface contact pressure between the femoral head and the acetabulum. The objective of this study was to determine the change in surface contact pressure after an innominate osteotomy for the correction of acetabular dysplasia. Method: The surface contact pressure of 70 hips was determined using the HipStress program, which is a calculated nomogram. The analysis was carried out with Pearson and Spearman correlations. The mean age of patients at the time of analysis was 7.5 years. Results: The mean HipStress for healthy hips used as controls was 1.66 MPa for hips with dysplasia it was 8.9 MPa; after a Salter osteotomy, it was 2.9 and after a Pemberton Osteotomy it was 3.1. The change in HipStress was -4.7 for hips undergoing a Salter osteotomy (p = 0.003) and -5.5 for hips undergoing a Pemberton osteotomy (p = 0.004). Conclusion: Both the Salter and Pemberton osteotomy, have the potential to reduce the value of HipStress in patients with dysplasia. The reduction in surface contact pressure should lead to a more durable joint.


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