Medical and Biological Engineering and Computing

, Volume 43, Issue 1, pp 102–106 | Cite as

Kinematic study of a reconstructed hip in paediatric oncology

  • F. Taddei
  • R. Stagni
  • A. Cappello
  • M. Manfrini
  • U. Albisinni
  • M. Viceconti


In 1997, a large portion of the femur of a four-year-old child affected by a Ewing's sarcoma was reconstructed with an innovative technique that used a massive bone allograft, in conjunction with a vascularised fibula autograft that was directly articulated within the acetabulum. The aim of the present study was to assess the kinematic behaviour of the reconstructed hip during flexion, once the acute remodelling process observed after the operation had ceased. A few additional CT slices of the hip joint region, in a flexed position, were taken at month 33 of the follow-up. The helical axes relative to the neutral-flexion motor action were estimated: their relative positions, with respect to the anatomical femoral heads, were compared, and the translation of the anatomical head centres was estimated. The angles spanned by the two femurs were almost equal, as were the translations along the respective helical axis. The main difference between the two femurs was the distance between the estimated femoral head centres and the relative helical axes. This resulted in a non-negligible translation of 2.9 mm of the fibula head inside the acetabulum during flexion, significantly higher than the 0.5 mm found for the intact contralateral femur. The results showed that, although the transplanted fibula grew and remodelled during the follow up, the action of the reconstructed hip joint still cannot be described as a ball-and-socket.


Limb-salvage surgery Remodelling Hip joint Helical axis CT examination 


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Copyright information

© FMBE 2005

Authors and Affiliations

  • F. Taddei
    • 1
  • R. Stagni
    • 4
  • A. Cappello
    • 4
  • M. Manfrini
    • 3
  • U. Albisinni
    • 2
  • M. Viceconti
    • 1
  1. 1.Laboratorio di Tecnologia MedicaIstituti Ortopedici RizzoliBolognaItaly
  2. 2.Department of RadiologyIstituti Ortopedici RizzoliBolognaItaly
  3. 3.Skeletal Oncology DepartmentIstituti Ortopedici RizzoliBolognaItaly
  4. 4.DEISUniversity of BolognaBolognaItaly

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