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Radiographic angles in hallux valgus: differences between measurements made manually and with a computerized program.

Carlos Piqué-Vidal1, Ignaci Maled-García, Juanjo Arabi-Moreno

  • 1Centro Medico Teknon, Barcelona, Spain. 6652cpv@comb.es

Foot & Ankle International
|March 17, 2006
PubMed
Summary

Computerized measurements of hallux valgus deformities using Autocad software are more reliable than manual goniometer measurements. Manual methods may underestimate smaller angles like IMA and PPAA.

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Area of Science:

  • Orthopedics
  • Radiology
  • Medical Imaging Analysis

Background:

  • Hallux valgus (HV) deformities require accurate angular measurements for effective evaluation.
  • Traditional manual goniometer measurements may lack reliability compared to newer digital methods.

Purpose of the Study:

  • To compare angular measurements for hallux valgus (HV) using a goniometer versus a computerized program.
  • To assess the concordance and reliability of manual versus digital measurement techniques.

Main Methods:

  • Preoperative weightbearing radiographs of 176 symptomatic hallux valgus patients were analyzed.
  • Manual angular measurements (HVA, IMA, DMAA, PPAA) were taken with a goniometer.
  • Digital measurements of the same angles were performed using Autocad software on digitized images.

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Main Results:

  • Autocad measurements yielded significantly higher mean values for IMA and PPAA compared to the goniometer.
  • Manual measurements tended to show higher DMAA values, while Autocad showed higher IMA and PPAA values.
  • Intraclass correlation coefficients indicated excellent concordance for HVA (0.89) and DMAA (0.80), but poor concordance for PPAA (0.11) and IMA (0.42).

Conclusions:

  • Computerized angular measurements using Autocad on weightbearing radiographs are more reliable for hallux valgus evaluation.
  • While HVA and DMAA measurements showed similarity between methods, manual techniques may underestimate IMA and PPAA.
  • Digital analysis offers improved reliability for assessing key angular parameters in hallux valgus.