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Related Concept Videos

Adjusting a Traverse01:12

Adjusting a Traverse

In the site survey of a four-sided traverse, internal angles are essential to ensure geometric accuracy. The survey revealed that the sum of the measured internal angles was 359 degrees and 48 minutes, which is 12 minutes less than the expected 360 degrees. This discrepancy signals an error likely arising from measurement inaccuracies during the fieldwork.To rectify this error, the adjustment process involved distributing the 12-minute shortfall equally across the four internal angles. By...

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An Anatomical Study of Nerves at Risk During Minimally Invasive Hallux Valgus Surgery
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Cadaveric evaluation of MIS akin variation on length and angular correction.

Steven R Cooperman1, Jaeyoon Kim2, Orlando Martinez2

  • 1Fellowship-Trained Foot and Ankle Surgeon, Lake Cumberland Regional Hospital, Somerset, KY 42503 USA.

The Journal of Foot and Ankle Surgery : Official Publication of the American College of Foot and Ankle Surgeons
|August 3, 2025
PubMed
Summary

Larger burr sizes (2.9 mm) and specific osteotomy types significantly improve correction for minimally invasive Akin osteotomies in bunion surgery. Careful planning and burr selection are key for optimal outcomes.

Keywords:
BunionHallux abductovalgusHallux valgusMinimally invasive surgery

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Area of Science:

  • Orthopedic Surgery
  • Foot and Ankle Surgery
  • Minimally Invasive Procedures

Background:

  • Hallux abductovalgus (bunion) is a prevalent forefoot condition with various surgical treatments.
  • Minimally invasive surgery (MIS) is increasingly adopted for foot and ankle procedures.
  • Data on the efficacy of MIS Akin osteotomies for bunion correction is limited.

Purpose of the Study:

  • To compare angular and length changes from oblique versus transverse Akin osteotomies.
  • To evaluate the impact of two burr sizes (2.0 mm and 2.9 mm) on osteotomy outcomes.
  • To assess correction achieved in a cadaveric model for bunion deformity.

Main Methods:

  • A cadaveric study utilizing twenty thawed above-knee limbs (ten pairs).
  • Matched pairs underwent either oblique or transverse Akin osteotomies.
  • Left limbs were treated with a 2.0 mm burr, right limbs with a 2.9 mm burr, measuring angular and length changes.

Main Results:

  • The 2.9 mm burr yielded significantly greater angular correction and bone shortening than the 2.0 mm burr (p = 0.002).
  • Oblique osteotomies with the 2.9 mm burr achieved 9.40° correction versus 4.43° with the 2.0 mm burr (p = 0.037).
  • Transverse osteotomies showed 14.87° correction with the 2.9 mm burr compared to 6.64° with the 2.0 mm burr (p = 0.037).

Conclusions:

  • Burr size and osteotomy orientation critically influence correction in MIS Akin osteotomies.
  • A larger burr size (2.9 mm) provides more substantial angular and length correction.
  • Findings emphasize the importance of preoperative planning and deliberate burr selection for successful MIS bunion surgery.