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Related Experiment Videos

The surgical tibiotalar angle: a radiologic study.

Markus Knupp1, Hanspeter Ledermann, Olaf Magerkurth

  • 1Department of Orthopaedic Surgery, University Hospital of Basel, Spitalgasse 21, 4051 Basel, Switzerland. Knupp_m@hotmail.com

Foot & Ankle International
|September 22, 2005
PubMed
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The tibial tuberosity is a reliable reference for measuring the tibiotalar angle on radiographs. This measurement is consistent between individuals, making contralateral leg measurements useful when one ankle is damaged.

Area of Science:

  • Orthopedic surgery
  • Radiographic anatomy
  • Biomechanical analysis

Background:

  • Hindfoot anatomy is extensively studied in cadavers, but radiographic measurements are less defined.
  • Radiographic quantification of hindfoot anatomy, specifically the tibiotalar angle, requires reliable reference points.

Purpose of the Study:

  • To define and quantify the tibiotalar angle using the tibial tuberosity as a novel reference point.
  • To establish the reliability of the tibial tuberosity as a reference for tibiotalar angle measurement on anteroposterior radiographs.

Main Methods:

  • Measurement of the tibiotalar angle on anteroposterior (AP) radiographs of 168 ankles.
  • Utilized the tibial tuberosity as the reference point for angle measurement.
  • Included bilateral radiographs from 75 patients to assess intraindividual differences.

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Main Results:

  • The mean tibiotalar angle was 92.4 degrees (SD = 3.1).
  • No significant intraindividual differences were observed in tibiotalar angle measurements between bilateral radiographs.
  • Increased varus alignment was noted in women and with advancing age.

Conclusions:

  • The tibial tuberosity serves as a dependable reference point for measuring the tibiotalar angle in radiographic assessments.
  • The consistency of the tibiotalar angle between contralateral legs allows for measurement from the unaffected limb in cases of severe ankle destruction.
  • This radiographic measurement is applicable to numerous hindfoot operative procedures.