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Evaluation of atraumatic hip instability measured by triaxial accelerometry during walking
Alejandro Neira1,2, Tomas Amenabar3,4, Iver Cristi-Sánchez1,2
1Laboratorio Ciencias del Ejercicio, Clínica MEDS, Santiago, Chile.
Journal of Hip Preservation Surgery
|October 30, 2019
Summary
Hip instability increases abnormal hip joint motion and dynamic loading. This study found higher acceleration magnitudes in patients with hip instability during walking compared to healthy individuals.
Area of Science:
- Biomechanics
- Orthopedics
- Human Movement Analysis
Background:
- Hip joint instability significantly impairs normal hip function.
- Diagnosing hip instability is challenging due to the lack of definitive tests.
- Instability leads to excessive femoroacetabular translation and altered hip loading.
Purpose of the Study:
- To quantify triaxial and overall acceleration magnitudes during gait in individuals with hip instability.
- To compare these acceleration patterns with those of healthy, asymptomatic controls.
- To test the hypothesis that hip instability increases acceleration values.
Main Methods:
- Ten patients with diagnosed hip instability and ten healthy controls participated.
- Triaxial accelerometers were attached to the greater trochanter bilaterally.
- Acceleration data (axial, anteroposterior, mediolateral) were recorded during treadmill walking.
Main Results:
- The hip instability group exhibited a significantly higher mean overall acceleration magnitude (1.51 g) than the control group (1.07 g).
- Significant differences were observed in axial, anteroposterior, and mediolateral accelerations between groups.
- Specifically, axial and mediolateral accelerations were higher, while anteroposterior acceleration was lower in the hip instability group.
Conclusions:
- Human movement analysis, specifically acceleration measurement, can differentiate individuals with hip instability from healthy controls.
- Elevated axial and mediolateral accelerations, alongside reduced anteroposterior acceleration, are characteristic of gait in hip instability.
- These findings support the use of accelerometry in evaluating hip joint dynamics and potentially aiding in the assessment of hip instability.
