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Tuyển tập các báo cáo nghiên cứu về hóa học được đăng trên tạp chí sinh học quốc tế đề tài : A biomechanical assessment of modular and monoblock revision hip implants using FE analysis and strain gage measurements | Bougherara et al. Journal of Orthopaedic Surgery and Research 2010 5 34 http www.josr-online.eom content 5 1 34 éHMÌ JOURNAL OF ORTHOPAEDIC MBs SURGERY AND RESEARCH TECHNICAL NOTE Open Access Abiomechanical assessment of modular and monoblock revision hip implants using FE analysis and strain gage measurements Habiba Bougherara 1 Rad Zdero 1 2 Suraj Shah2 Milan Miric1 Marcello Papini1 Paul Zalzal3 and Emil H Schemitsch2 4 Abstract Background The bone loss associated with revision surgery or pathology has been the impetus for developing modular revision total hip prostheses. Few studies have assessed these modular implants quantitatively from a mechanical standpoint. Methods Three-dimensional finite element FE models were developed to mimic a hip implant alone Construct A and a hip implant-femur configuration Construct B . Bonded contact was assumed for all interfaces to simulate longterm bony ongrowth and stability. The hip implants modeled were a Modular stem having two interlocking parts Zimmer Modular Revision Hip System Zimmer Warsaw IN USA and a Monoblock stem made from a single piece of material Stryker Restoration HA Hip System Stryker Mahwah NJ USA . Axial loads of 700 and 2000 N were applied to Construct A and 2000 N to Construct B models. Stiffness strain and stress were computed. Mechanical tests using axial loads were used for Construct A to validate the FE model. Strain gages were placed along the medial and lateral side of the hip implants at 8 locations to measure axial strain distribution. Results There was approximately a 3 average difference between FE and experimental strains for Construct A at all locations for the Modular implant and in the proximal region for the Monoblock implant. FE results for Construct B showed that both implants carried the majority Modular 76 Monoblock 66 of the 2000 N load relative to the femur. FE analysis and experiments demonstrated that the Modular implant was 3 to 4.5 times mechanically stiffer than the Monoblock .
