DuoThread™ Scarf N

Self-tapping, cannulated compression screw with head thread

The DuoThread™ Scarf N is a cannulated, self-drilling, self-tapping compression screw available with either full or partial thread, and with an additional head thread. Compression is established through unequal thread pitches at the screw head and shaft. The screw is used to secure and stabilise bones or bone fragments following osteotomies (Akin, scarf, chevron, or closing wedge) and arthrodeses (interphalangeal or MTP joint). Since its cylindrical head does not exert any further transverse forces on the corticalis during screw insertion, it is particularly gentle in this regard.

Properties / technical data

  • Different thread pitches on screw head and shaft create compression
  • Available as full or partial thread
    – Full thread Ø 3.0 mm, available in lengths of 10 to 40 mm
    – Partial thread Ø 3.0 mm, available in lengths of 12 to 40 mm
  • Cannulated for K-wire: Ø 1.0 mm
  • Sterile
  • Torx T8 connection
  • Material: Titanium alloy (TiAl6V4 ELI, ISO 5832-3)


  • Hallux Valgus
  • Hallux Rigidus
  • Arthrosis of the metatarsophalangeal joint (MTP joint)
  • Interphalangeal arthrosis

Case studies

Various case studies related to the DuoThread™ Scarf N screw will soon be available here. If you have any questions regarding individual treatment strategies or would like more information, please contact Customer Service.

Media library

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