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Related Experiment Video

Updated: May 19, 2026

In Vivo Quantification of Hip Arthrokinematics during Dynamic Weight-bearing Activities using Dual Fluoroscopy
07:43

In Vivo Quantification of Hip Arthrokinematics during Dynamic Weight-bearing Activities using Dual Fluoroscopy

Published on: July 2, 2021

Variations in ankle registration using two different anatomic landmarks: a radiographic study.

Eduardo M Suero1, Mustafa Citak, Charles Claps

  • 1Department of Orthopaedic Surgery, Hospital for Special Surgery, 535 E 70th St., New York, NY, 10021, USA, eduardosuero@gmail.com.

Knee Surgery, Sports Traumatology, Arthroscopy : Official Journal of the ESSKA
|August 10, 2012
PubMed
Summary
This summary is machine-generated.

Related Concept Videos

Ankle Joint01:10

Ankle Joint

The ankle is formed by the talocrural joint (crural = leg). It consists of the articulations between the talus bone of the foot and the distal ends of the tibia and fibula of the leg. The superior aspect of the talus bone is square-shaped and has three areas of articulation. The top of the talus articulates with the inferior tibia. This is the portion of the ankle joint that carries the body weight between the leg and foot. The sides of the talus are firmly held in position by the articulations...

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Accurate ankle center registration is crucial for knee replacement surgery. Both the Extremes Midpoint and Distal Midpoint techniques provide reliable results, unaffected by patient body mass index (BMI).

Area of Science:

  • Orthopedic surgery
  • Biomechanical analysis
  • Medical imaging

Background:

  • Accurate registration of the ankle center is vital for precise tibial mechanical axis alignment during total knee replacement (TKR).
  • Two common methods for ankle center registration involve using the extreme medial and lateral points or the most distal points of the malleoli.

Purpose of the Study:

  • To compare the accuracy of two ankle center registration techniques: the Extremes Midpoint and the Distal Midpoint.
  • To determine if body mass index (BMI) influences the accuracy of mechanical axis registration in navigated TKR.

Main Methods:

  • Analysis of preoperative standing hip-knee-ankle radiographs from 40 patients undergoing navigated TKR.
  • Quantification of the deviation (in degrees and millimeters) from the anatomic ankle center for both registration techniques.

Related Experiment Videos

Last Updated: May 19, 2026

In Vivo Quantification of Hip Arthrokinematics during Dynamic Weight-bearing Activities using Dual Fluoroscopy
07:43

In Vivo Quantification of Hip Arthrokinematics during Dynamic Weight-bearing Activities using Dual Fluoroscopy

Published on: July 2, 2021

Main Results:

  • Both the Extremes Midpoint and Distal Midpoint techniques demonstrated minimal average deviation in ankle center registration (0.2° lateral).
  • No statistically significant difference in accuracy was found between the two methods.
  • Body mass index (BMI) did not significantly impact the accuracy of either registration technique.

Conclusions:

  • The Extremes Midpoint and Distal Midpoint techniques are both accurate methods for registering the ankle center in navigated TKR.
  • Surgeons can confidently choose either technique, as BMI does not appear to affect registration accuracy.
  • These findings can aid in selecting appropriate ankle registration methods, potentially improving the precision of knee replacement navigation systems.