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Related Concept Videos

Ankle Joint01:10

Ankle Joint

2.4K
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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Related Experiment Video

Updated: Dec 12, 2025

A Mouse Model of Ankle-Subtalar Complex Joint Instability
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Functional deficits in chronic mechanical ankle instability.

Markus Wenning1,2, Dominic Gehring3, Marlene Mauch4

  • 1Rennbahnklinik, Kriegackerstr 100, CH-4132 Muttenz, Basel, Switzerland. research@rennbahnklinik.ch.

Journal of Orthopaedic Surgery and Research
|August 9, 2020
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Summary
This summary is machine-generated.

Chronic ankle instability leads to reduced strength and altered movement patterns. These functional deficits persist even after treatment, indicating potential muscular dysfunction in mechanically unstable ankles.

Keywords:
Mechanical ankle instabilityPerformance deficitsPeroneal dysfunction

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Area of Science:

  • Orthopedics
  • Sports Medicine
  • Biomechanics

Background:

  • Chronic ankle instability (CAI) presents a significant challenge due to the interplay of functional and mechanical deficits.
  • While some individuals adapt, others require mechanical support following an initial ankle sprain.
  • This research focuses on identifying persistent functional impairments in mechanically unstable ankles necessitating surgical intervention.

Purpose of the Study:

  • To analyze the functional deficits present in patients with chronic, unilateral mechanical ankle instability (MAI) where conservative treatments have failed.
  • To compare functional testing results between affected (MAI) and non-affected ankles.

Main Methods:

  • Retrospective analysis of functional testing in 43 patients with chronic, unilateral MAI.
  • Functional tests included balance assessment, gait analysis, and isokinetic strength measurements.
  • Manual testing and arthroscopy confirmed mechanical instability.

Main Results:

  • MAI ankles showed significantly reduced strength in plantarflexion, supination, and pronation.
  • Active range of motion was diminished in dorsiflexion and supination for MAI ankles.
  • Patients with MAI exhibited increased postural sway and altered gait patterns, including increased external rotation.

Conclusions:

  • Chronic MAI is associated with persistent functional deficits in postural control, gait, and strength, even after conservative treatment.
  • Reduced pronation strength, particularly in positions near the point of injury, suggests underlying muscular dysfunction.
  • These functional impairments, combined with mechanical instability, may identify patients who would benefit from surgical stabilization.