Biomechanical analysis of two types of osseointegrated transfemoral prosthesis

Agostino Igor Mirulla, Stefano Di Paolo, Francesco Di Simone, Tommaso Ingrassia, Vincenzo Nigrelli, Stefano Zaffagnini, Laura Bragonzoni

Research output: Contribution to journalArticlepeer-review


In the last two decades, osseointegrated prostheses have been shown to be a good alternative for lower limb amputees experiencing complications in using a traditional socket-type prosthesis; however, restraining biomechanical issues, such as peri-prosthetic bone fractures or loosening, are present. To better understand and overcome these limiting issues, and thus reduce the number of implant failures, many studies have investigated the stress distribution on bone and implant during normal daily activities. The aim of this study was a biomechanical analysis of two different osseointegrated implants, a screw-type (OPRA) and a press fit system (OPL, Osseointegrated Prosthetic Limb), to evaluate the stresses generated in bone and prosthesis during a fall. In particular, four scenarios have been experimentally reproduced to determine the loads on the limb during different kinds of fall. For this purpose, a motion capture system and a force plate have been used. Numerical FEM (Finite Element Method) simulations have been performed to compare the behaviour of the OPRA and OPL systems in different fall scenarios. The obtained results showed that a fall backwards due to balance loss is the most stressful scenario among the ones analysed. As regards the comparison between OPRA and OPL devices, it emerged they have similar behaviours in terms of peak values of the stress, but the OPL implant generates larger high-stress areas in the distal femur as compared with the OPRA system.

Original languageEnglish
Article number8263
Pages (from-to)1-16
Number of pages16
JournalApplied Sciences (Switzerland)
Issue number22
Publication statusPublished - Nov 2 2020


  • CAD
  • Finite element analysis
  • OPL osseointegrated prosthesis
  • OPRA
  • Transfemoral amputee

ASJC Scopus subject areas

  • Materials Science(all)
  • Instrumentation
  • Engineering(all)
  • Process Chemistry and Technology
  • Computer Science Applications
  • Fluid Flow and Transfer Processes


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