Influence of cerclages on primary stability of tumor megaprostheses subjected to distal femur defects

Jahnke, Alexander; Jakubowitz, Eike; Ishaque, Bernd; Rickert, Markus; Bischel, Oliver

doi:10.1016/j.injury.2015.10.031

Cited by 7 publications

(2 citation statements)

References 26 publications

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“…The maximum translational and rotational interface relative micromotions are then determined by the maximum respective amounts of the obtained vectors. Maximum interface relative micromotions of the repeated series of n = 50 gait cycles result from subtracting the measured maximal relative micromotions of the foam and the cup, similarly to recently published studies . This resulted in n = 50 interface relative micromotion curves, which were averaged using the simple moving average method.…”

Section: Methodsmentioning

confidence: 92%

“…One of the main functions of our novel in vitro 3D‐measuring set‐up, which makes it different from other in vitro set‐ups for determining the anchorage of artificial acetabular cups consists in the fact that the motion of the hip joint is included in the testing procedure by three torque curves around three axes, the torques being quasi synchronously applied onto the cup. Additionally, a decisive advantage compared to previous studies, where a 3‐2‐1 arrangement of the sensors was used, consists in the fact that with the measuring system used here the normal vectors of each plane X, Y, and Z are determined separately. This reduces the systematic error propagation and therefore causes higher measurement accuracy.…”

Section: Discussionmentioning

confidence: 99%

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Effect of bearing friction torques on the primary stability of press‐fit acetabular cups: A novel in vitro method

Jahnke

Schroeder

Ulloa

et al. 2018

Journal Orthopaedic Research

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Aseptic loosening is the main reason for revision of total hip arthroplasty, and relative micromotions between cementless acetabular cups and bone play an important role regarding their comparatively high loosening rate. Therefore, the aim of the present study was to analyze the influence of resulting frictional torques on the primary stability of press-fit acetabular cups subjected to two different bearing partners. A cementless press-fit cup was implanted in bone-like foam. Primary stability of the cup was analyzed by determining spatial total, translational, and rotational interface micromotions by means of an eddy current sensor measuring system. Torque transmission into the cup was realized by three synchronous servomotors considering resultant friction torques based on constant friction for ceramic-on-ceramic (CoC: μ = 0.044; max. resultant torque: 1.5 Nm) and for ceramic-on-polyethylene (CoP: μ = 0.063; max. resultant torque: 1.9 Nm) bearing partners. Rotational micromotion of CoC was 8.99 ± 0.85 µm and of CoP 13.39 ± 1.43 µm. Translational micromotion of CoC was 29.93 ± 1.44 μm and of CoP 39.91 ± 2.25 μm. Maximum total relative micromotions were 37.10 ± 1.07 μm for CoC and 51.64 ± 2.18 μm for CoP. Micromotions resulting from CoC were statistically lower than those resulting from CoP (p < 0.05). The described 3D-measuring set-up offers a novel in vitro method of measuring primary stability of acetabular cups. We can therefore conclude, that primary stability of acetabular cup systems can be observed using either the lower friction curve (CoC) or the higher friction curve (CoP). In future studies different cup designs or cup fixation mechanisms may be tested and compared in vitro and assessed prior to implantation. © 2018 Orthopaedic Research Society. Published by Wiley Periodicals, Inc. J Orthop Res 36:2745-2753, 2018.

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Section: Methodsmentioning

confidence: 92%

Section: Discussionmentioning

confidence: 99%

Effect of bearing friction torques on the primary stability of press‐fit acetabular cups: A novel in vitro method

Jahnke

Schroeder

Ulloa

et al. 2018

Journal Orthopaedic Research

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Modular tumor prostheses: are current stem designs suitable for distal femoral reconstruction? A biomechanical implant stability analysis in Sawbones

Bischel

Nadorf

Klein

et al. 2019

Arch Orthop Trauma Surg

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Effect of thermodisinfection on mechanic parameters of cancellous bone

et al. 2016

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Revision surgery of joint replacements is increasing and raises the demand for allograft bone since restoration of bone stock is crucial for longevity of implants. Proceedings of bone grafts influence the biological and mechanic properties differently. This study examines the effect of thermodisinfection on mechanic properties of cancellous bone. Bone cylinders from both femoral heads with length 45 mm were taken from twenty-three 6-8 months-old piglets, thermodisinfected at 82.5 °C according to bone bank guidelines and control remained native. The specimens were stored at -20 °C immediately and were put into 21 °C Ringer's solution for 3 h before testing. Shear and pressure modulus were tested since three point bending force was examined until destruction. Statistical analysis was done with non-parametric Wilcoxon, t test and SPSS since p < 0.05 was significant. Shear modulus was significantly reduced by thermodisinfection to 1.02 ± 0.31 GPa from 1.28 ± 0.68 GPa for unprocessed cancellous bone (p = 0.029) since thermodisinfection reduced pressure modulus not significantly from 6.30 ± 4.72 GPa for native specimens to 4.97 ± 2.23 GPa and maximum bending force was 270.03 ± 116.68 N for native and 228.80 ± 70.49 N for thermodisinfected cancellous bone. Shear and pressure modulus were reduced by thermodisinfection around 20 % and maximum bending force was impaired by about 15 % compared with native cancellous bone since only the reduction of shear modulus reached significance. The results suggest that thermodisinfection similarly affects different mechanic properties of cancellous bone and the reduction of mechanic properties should not relevantly impair clinical use of thermodisinfected cancellous bone.

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Influence of cerclages on primary stability of tumor megaprostheses subjected to distal femur defects

Cited by 7 publications

References 26 publications

Effect of bearing friction torques on the primary stability of press‐fit acetabular cups: A novel in vitro method

Effect of bearing friction torques on the primary stability of press‐fit acetabular cups: A novel in vitro method

Modular tumor prostheses: are current stem designs suitable for distal femoral reconstruction? A biomechanical implant stability analysis in Sawbones

Effect of thermodisinfection on mechanic parameters of cancellous bone

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