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Scaphoid nonunion and distal fragment resection: analysis with three-dimensional rigid body spring model

  • Original Article
  • Published:
Journal of Orthopaedic Science

Abstract

Background

Distal fragment resection is one of the salvage procedures for scaphoid nonunion with osteoarthritis. Despite being reported as a simple procedure with favorable midterm outcomes, further arthritic changes remain a concern in the long term. Scaphoid waist fracture is classified into volar or dorsal types according to the displacement pattern, but the indications for distal fragment resection have never been discussed for these fracture types.

Method

We reconstructed a normal wrist model from computed tomography images and performed theoretical analysis utilizing a three-dimensional rigid body spring model. Two types of scaphoid fracture nonunion followed by distal fragment resection were simulated.

Results

With volar-type nonunion, the force transmission ratio of the radiolunate joint increased, and the pressure concentration was observed in the dorsal part of the scaphoid fossa and volar part of the lunate fossa of the radius; no deterioration was seen in the midcarpal joint. In the distal fragment resection simulation for volar-type nonunion, pressure concentrations of the radiocarpal joint resolved. With dorsal-type nonunion, force transmission ratio in the radiocarpal joint resembled that of the normal joint model. Pressure concentrations were observed in the dorsoulnar part of the scaphoid fossa and radial styloid. The pressure concentration in the dorsoulnar part of the scaphoid fossa disappeared in the resection model, whereas the concentration in the radial styloid remained. In the midcarpal joint, pressure was concentrated around the capitate head in the nonunion model and became aggravated in the resection model.

Conclusions

With volar-type scaphoid nonunion, distal fragment resection seems to represent a reasonable treatment option. With dorsal-type nonunion, however, pressure concentration around the capitate head was aggravated with the simulated distal fragment resection, indicating a potential risk of worsening any preexisting lunocapitate arthritis.

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Authors and Affiliations

  1. Department of Orthopedic Surgery, Nishio Municipal Hospital, Nishio, Japan

    Hiroshi Matsuki

  2. Department of Orthopedic Surgery, Nagoya First Red Cross Hospital, 3-35 Michishita-cho, Nakamura-ku, Nagoya, 453-8511, Japan

    Emiko Horii

  3. Department of Orthopedic Surgery, Yokkaichi Municipal Hospital, Yokkaichi, Japan

    Masataka Majima

  4. Rosai Rehabilitation Engineering Center, Nagoya, Japan

    Eiichi Genda

  5. Department of Hand Surgery, Nagoya University Graduate School of Medicine, Nagoya, Japan

    Shukuki Koh & Hitoshi Hirata

Authors
  1. Hiroshi Matsuki
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  2. Emiko Horii
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  3. Masataka Majima
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  4. Eiichi Genda
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  5. Shukuki Koh
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  6. Hitoshi Hirata
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Matsuki, H., Horii, E., Majima, M. et al. Scaphoid nonunion and distal fragment resection: analysis with three-dimensional rigid body spring model. J Orthop Sci 14, 144–149 (2009). https://doi.org/10.1007/s00776-008-1310-y

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  • DOI: https://doi.org/10.1007/s00776-008-1310-y

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