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Minimally Invasive Chevron Akin Osteotomy: Preoperative Planning Using the Radiographic First-Ray Squeeze Test.

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This summary is machine-generated.

The radiographic first-ray squeeze test accurately predicts first metatarsal displacement after minimally invasive chevron Akin (MICA) surgery for hallux valgus (HV). This test helps surgeons anticipate and manage potential complications during HV surgical planning.

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MICAfirst metatarsocuneiform jointhallux valgushypermobilityminimally invasive hallux valgus

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Area of Science:

  • Orthopedic Surgery
  • Foot and Ankle Surgery
  • Radiographic Assessment

Background:

  • Preoperative identification of first-ray hypermobility is crucial for effective hallux valgus (HV) surgical planning.
  • Minimally invasive chevron Akin (MICA) osteotomy can lead to varus displacement of the first metatarsal osteotomy's proximal fragment.
  • Evaluating predictive tools for this displacement is essential for surgical success.

Purpose of the Study:

  • To assess the predictive capability of the radiographic first-ray squeeze test for varus displacement of the first metatarsal proximal fragment following MICA.
  • To correlate preoperative radiographic findings with postoperative outcomes in HV patients undergoing MICA.

Main Methods:

  • A prospective case series included patients with moderate to severe HV undergoing MICA.
  • Hallux valgus angle (HVA) and first-second intermetatarsal angle (1-2 IMA) were compared preoperatively and postoperatively (12 weeks).
  • The radiographic first-ray squeeze test (IMA-ST) was compared with postoperative intermetatarsal angle of the proximal fragment (IAPF) to evaluate predictive accuracy.

Main Results:

  • MICA surgery significantly improved mean IMA (13.8 to 3.8 degrees) and HVA (27.8 to 4.9 degrees) (P < .001).
  • Linear regression analysis demonstrated a strong association between the preoperative IMA-ST and the 12-week postoperative IAPF (P < .001).
  • The study included 39 feet in 28 patients between July 2022 and May 2023.

Conclusions:

  • The preoperative radiographic first-ray squeeze test is a reliable predictor of proximal fragment varus displacement after MICA.
  • This test aids in surgical planning and management of potential complications in hallux valgus surgery.
  • The study is a Level III prospective cohort study.