ObjectiveTo evaluate, through biomechanical testing, the resistance to and energy required for the occurrence of proximal femoral fracture in synthetic bone after removal of a proximal femoral nail model (PFN), comparing the results obtained with a reinforcement technique using polymethylmethacrylate (PMMA).MethodsFifteen synthetic bones were used: five units for the control group (CG), five for the test group without reinforcement (TGNR), and five for the test group with reinforcement (TGR). The biomechanical analysis was performed simulating a fall on the trochanter using a servo-hydraulic machine. In the GC, the assay was performed with the PFN intact. In the TGNR and TGR groups, a model of PFN was introduced and the tests were performed in the TGNR, after simple removal of the synthesis material, and in the TGR, after removal of the same PFN model and filling of the cavity in the femoral neck with PMMA.ResultsAll groups presented a basicervical fracture. The CG presented a mean of 1427.39 Newtons (N) of maximum load and 10.14 Joules (J) of energy for the occurrence of the fracture. The TGNR and TGR presented 892.14 N and 1477.80 N of maximum load, and 6.71 J and 11.99 J of energy, respectively. According to the Kruskal–Wallis ANOVA, there was a significant difference in the maximum load (p = 0.009) and energy (p = 0.007) between these groups.ConclusionThe simple removal of a PFN in synthetic bone showed a significant reduction of the maximum load and energy for the occurrence of fracture, which were re-established with a reinforcement technique using PMMA.

SThe apophyseal fracture or avulsion of the greater trochanter occurs in skeletally immature patients. It has at etiological factors indirect mechanisms (avulsion) and direct mechanisms (trauma on the trochanter), the latter being the most common. The clinical presentation is easily identified and a simple X- ray can confirm the diagnosis. Regardless of the treatment chosen, this pathology has a high correlation with osteonecrosis of the femoral head, even as a rare fact, however with innocent appearance, on this pathology.

We present a unique case of displaced simultaneous bilateral fractures, Garden 3 type, in a 49 year woman treated with non-cemented total hip arthroplasty. The patient showed a Harris hip score of 86 on the right hip and a 81 on the left side on the fourth postoperative year, besides a bilateral Trendelenburg gait, more pronounced on the right side. She needed a cane to walk, and felt pain in the left thigh. The X-ray showed a shortening of 0.9 cm and a left femoral varus. The other arthroplasty components showed good osseointegration and position.We found that the use of the uncemented total hip arthroplasty to treat a simultaneous bilateral fracture in renal osteodystrophy patients has satisfactory results at a four year follow-up.According to the OCEBM Levels of Evidence Working Group, this study is graded as a Level of Evidence IV.

ResumoOs autores relatam um único caso de artroplastia total de quadril primária complexa em uma paciente do sexo feminino de 34 anos, com dismetria de membros inferiores de 5,5 cm, na qual foi feita tenotomia do glúteo máximo a fim de prevenir lesão do nervo ciático. Tal cirurgia foi feita sob monitoração eletroneurofisiológica dos ramos fibular e tibial do nervo ciático. Foram coletados dados pré-tenotomia, pós-tenotomia e pós-redução artroplástica. Os achados demonstram que a tenotomia do glúteo máximo melhorou a reposta motora do componente fibular do nervo ciático.

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