Static bending test after proximal femoral nail (PFN) removal – in vitro analysis☆

نویسندگان

  • Leonardo Morais Paiva
  • Sílvio Leite de Macedo Neto
  • Diogo Ranier de Macedo Souto
  • George Neri Barros Ferreira
  • Hélio Ismael da Costa
  • Anderson Freitas
چکیده

OBJECTIVE To 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). METHODS Fifteen 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. RESULTS All 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. CONCLUSION The 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.

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

منابع مشابه

Type II Intertrochanteric Fractures: Proximal Femoral Nailing (PFN) Versus Dynamic Hip Screw(DHS)

  Background: Intertrochanteric fracture is one of the most common fractures of the hip especially in the elderly with osteoporotic bones, usually due to low-energy trauma like simple falls. Dynamic Hip Screw (DHS) is still considered the gold standard for treating intertrochanteric fractures by many. Not many studies compare the DHS with Proximal femoral nail (PFN), in Type II intertrochanteri...

متن کامل

The fixion proximal femur nailing system: biomechanical properties of the nail and a cadaveric study.

The treatment of choice for early mobilization of hip fracture is surgery, which traditionally employs side plates and screws or intramedullary nails. We examined the biomechanical properties of a new proximal femoral nail system. The new expandable Fixion proximal femur nailing (PFN) system, made of stainless-steel alloy, consists of a nail, a peg and an anti-rotation pin. Upon positioning, th...

متن کامل

Management of Pertrochanteric Fractures with Proximal Femoral Nail and Comparison of Results with Dynamic Hip Screw

Introduction: Proximal Femoral Nail and Dynamic Hip Screw, both are the accepted implants for the internal fixation of Pertrochanteric fractures. Objectives of the research were to compare the results of proximal femoral nail and dynamic hip screw in terms of functional mobility of the patients and the results would also be compared in terms of operating time, peri-operative blood loss, radiolo...

متن کامل

Proximal femoral nail for treatment of trochanteric femoral fractures.

PURPOSE To report outcomes of 87 consecutive patients treated with a proximal femoral nail (PFN) for trochanteric femoral fractures. METHODS 17 men and 70 women aged 58 to 95 (mean, 85) years with trochanteric femoral fractures underwent PFN fixation using an intramedullary nail, a lag screw, and a hip pin. Fractures were classified according to the AO system; the most common fracture type wa...

متن کامل

Proximal femoral nail (Pfn) – a new stage in the theraPy of extracaPsular femoral fractures

The research was aimed at referring to contemporary problems concerning fractures of the proximal femur that, particularly in older patients, represent not only medical, but also social and nursing difficulties. Within November 2004 to March 2006, 83 patients with proximal femoral fractures were treated using PFN. Except for two cases, the post-operative course was favourable and patients could...

متن کامل

ذخیره در منابع من


  با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

عنوان ژورنال:

دوره 52  شماره 

صفحات  -

تاریخ انتشار 2017