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Related Experiment Video

Updated: Oct 3, 2025

An Anatomical Study of Nerves at Risk During Minimally Invasive Hallux Valgus Surgery
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Hallux Valgus Interphalangeus Measurement: Comparison of the 2 Radiographic Methods.

Nimesh Nebhani1, Mihir Yatin Trivedy1, Gavin Heyes1

  • 1Liverpool University Hospitals NHS Foundation Trust.

Foot & Ankle Specialist
|February 16, 2022
PubMed
Summary
This summary is machine-generated.

Delta PP and Hallux Interphalangeal Angle (HIA) both reliably assess hallux valgus interphalangeus (HVI). However, Delta PP more accurately quantifies surgical correction and aids in planning Akin osteotomies.

Keywords:
Delta proximal phalanxhallux interphalangeal anglehallux valgusinterphalangeus

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Area of Science:

  • Orthopedic Surgery
  • Radiology
  • Foot and Ankle Surgery

Background:

  • Hallux valgus interphalangeus (HVI) assessment relies on radiological parameters.
  • Hallux interphalangeal angle (HIA) and Delta PP are used to evaluate HVI.
  • The reliability of these parameters in preoperative and postoperative assessments needs clarification.

Purpose of the Study:

  • To compare the reliability of Delta PP and HIA in assessing HVI.
  • To evaluate their accuracy in preoperative and postoperative radiographs.
  • To determine which parameter better quantifies surgical correction and aids in surgical planning.

Main Methods:

  • Retrospective observational study of 186 feet with hallux valgus.
  • Radiological evaluation using Delta PP and HIA for hallux alignment.
  • Interobserver variability assessed using intraclass correlation coefficient.

Main Results:

  • Both HIA and Delta PP demonstrated high reliability (intraclass correlation coefficient > 0.8).
  • HIA increased postoperatively, suggesting underestimation of HVI preoperatively.
  • Delta PP decreased postoperatively and was a better determinant of deformity contribution to total valgus deformity.

Conclusions:

  • Both HIA and Delta PP are reproducible for HVI assessment.
  • Delta PP provides a more precise quantification of surgical correction.
  • Delta PP aids in accurate planning for Akin osteotomy by determining medial wedge resection dimensions.