[目的]研究同种异体骨支撑架结合自体骨和脱钙骨基质(decalcified bone matrix,DBM)植入治疗股骨头坏死生物力学变化。[方法]建立羊双侧股骨头坏死模型,4周后分为4组:单纯行髓芯减压组(A组)、髓芯减压后植入自体松质骨和OSTEOSET(2DBM...[目的]研究同种异体骨支撑架结合自体骨和脱钙骨基质(decalcified bone matrix,DBM)植入治疗股骨头坏死生物力学变化。[方法]建立羊双侧股骨头坏死模型,4周后分为4组:单纯行髓芯减压组(A组)、髓芯减压后植入自体松质骨和OSTEOSET(2DBM组(B组)、髓芯减压后植入同种异体骨支撑架/自体松质骨OSTEOSE(2DBM组(C组)和正常对照组。术后分别于5、10、20周对股骨头行影像学、组织学观察和生物力学测定。[结果]影像学和组织学检查结果显示C组在髓芯减压区骨缺损修复及成骨方面较B组略高,B、C两组都较同时期的A组明显增强。生物力学测试结果表明,术后5、10、20周时C组力学强度较A、B两组明显增高,差异有统计学意义(P<0.05),在10、20周时C组股骨头生物力学强度和正常股骨头己无明显差异。[结论]应用同种异体骨支撑架结合自体骨和脱钙骨基质治疗股骨头坏死,能有效加强股骨头的力学结构,促进坏死骨的修复,防止股骨头关节面的塌陷。展开更多
Background Features of necrotic lesions and various interventions could affect the biomechanics of the femoral head. A three-dimensional finite-element analysis was designed to demonstrate necrotic femoral head stress...Background Features of necrotic lesions and various interventions could affect the biomechanics of the femoral head. A three-dimensional finite-element analysis was designed to demonstrate necrotic femoral head stress changes with various sizes of necrotic lesions, and evaluate the effect of tantalum rods on preventing femoral head cracking. Methods Femoral computed tomography scans were used to build a normal three-dimensional finite-element femoral head model in a computer. Based on the normal model, necrotic models of different lesion diameters （15 mm, 20 mm and 30 mm） were created, as were the repaired models with tantalum rods for each diameter. After a series of meshing and force loading, the von Mises stress distributions, simulating single-legged stance, and stresses on specific points under loaded conditions were determined for each model. Results Deep exploration into the burdened area of the femoral head indicated that higher stresses to the femoral head were observed with a larger necrotic lesion; the largest stress concentration, 91.3 MPa, was found on the femoral head with a lesion diameter of 30 mm. By contrast, topical stress on the surface of the necrotic regions was lowered following implantation of a tantalum rod, and the changes in stress were significant in models with lesions of 15 mm and 30 mm in diameter, with the best biomechanical benefit from the tantalum rod found with a lesion diameter of 15 mm. Conclusions Femoral heads with larger necrotic lesions usually have a higher stress concentration and a higher risk of collapse. Various sized lesions on the femoral head can benefit from the mechanical support offered by the implantation of a tantalum rod; however, femoral heads with smaller sized lesions may benefit more. A thorough evaluation of the lesion size should be conducted prior to the use of tantalum rod implants in the treatment of femoral head necrosis.展开更多
基金The authors received grants from Natural Science Foundation of Guangdong Province(2014A030310214),Science and Technology Project of Guangdong Province(2014A020221041),and the Medical Science and Technology Foundation of Guangdong Province(A2015039).
文摘[目的]研究同种异体骨支撑架结合自体骨和脱钙骨基质(decalcified bone matrix,DBM)植入治疗股骨头坏死生物力学变化。[方法]建立羊双侧股骨头坏死模型,4周后分为4组:单纯行髓芯减压组(A组)、髓芯减压后植入自体松质骨和OSTEOSET(2DBM组(B组)、髓芯减压后植入同种异体骨支撑架/自体松质骨OSTEOSE(2DBM组(C组)和正常对照组。术后分别于5、10、20周对股骨头行影像学、组织学观察和生物力学测定。[结果]影像学和组织学检查结果显示C组在髓芯减压区骨缺损修复及成骨方面较B组略高,B、C两组都较同时期的A组明显增强。生物力学测试结果表明,术后5、10、20周时C组力学强度较A、B两组明显增高,差异有统计学意义(P<0.05),在10、20周时C组股骨头生物力学强度和正常股骨头己无明显差异。[结论]应用同种异体骨支撑架结合自体骨和脱钙骨基质治疗股骨头坏死,能有效加强股骨头的力学结构,促进坏死骨的修复,防止股骨头关节面的塌陷。
文摘Background Features of necrotic lesions and various interventions could affect the biomechanics of the femoral head. A three-dimensional finite-element analysis was designed to demonstrate necrotic femoral head stress changes with various sizes of necrotic lesions, and evaluate the effect of tantalum rods on preventing femoral head cracking. Methods Femoral computed tomography scans were used to build a normal three-dimensional finite-element femoral head model in a computer. Based on the normal model, necrotic models of different lesion diameters （15 mm, 20 mm and 30 mm） were created, as were the repaired models with tantalum rods for each diameter. After a series of meshing and force loading, the von Mises stress distributions, simulating single-legged stance, and stresses on specific points under loaded conditions were determined for each model. Results Deep exploration into the burdened area of the femoral head indicated that higher stresses to the femoral head were observed with a larger necrotic lesion; the largest stress concentration, 91.3 MPa, was found on the femoral head with a lesion diameter of 30 mm. By contrast, topical stress on the surface of the necrotic regions was lowered following implantation of a tantalum rod, and the changes in stress were significant in models with lesions of 15 mm and 30 mm in diameter, with the best biomechanical benefit from the tantalum rod found with a lesion diameter of 15 mm. Conclusions Femoral heads with larger necrotic lesions usually have a higher stress concentration and a higher risk of collapse. Various sized lesions on the femoral head can benefit from the mechanical support offered by the implantation of a tantalum rod; however, femoral heads with smaller sized lesions may benefit more. A thorough evaluation of the lesion size should be conducted prior to the use of tantalum rod implants in the treatment of femoral head necrosis.
