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

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Hip joint load in relation to leg length discrepancy.

Per Wretenberg¹, Anders Hugo, Eva Broström

¹Department of Molecular Medicine and Surgery, Section of Orthopedics and Sports Medicine, Karolinska Institute, Stockholm, Sweden;

Medical Devices (Auckland, N.Z.)

|August 24, 2012

Summary

This summary is machine-generated.

Simulated leg length discrepancy of 2 cm or more alters hip joint load during gait, with greater effects on the shorter leg. This increased stress may lead to long-term issues.

Keywords:

biomechanics gait analyses hip leg length discrepancy

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Area of Science:

Biomechanics
Orthopedics
Gait Analysis

Background:

Leg length discrepancy is common after total hip arthroplasty (THA) and in healthy individuals.
Previous studies show inconsistent leg length restoration post-THA.
The impact of leg length discrepancy on joint load during gait is not well understood.

Purpose of the Study:

To investigate the biomechanical effects of simulated leg length discrepancy on hip joint load during gait.
To quantify joint load changes with simulated discrepancies of 2 cm and 4 cm.

Main Methods:

Utilized three-dimensional (3D) gait analysis with motion capture and force plates.
Calculated hip joint moments across three degrees of freedom in nine healthy subjects.
Employed ANOVA for repeated measurements for statistical analysis.

Main Results:

A significant increase in abduction peak moment was observed on the shorter leg.
Adduction moment decreased on the longer leg with increasing discrepancy.
Internal hip rotation moments remained unchanged, while external rotation moment decreased on the longer leg.

Conclusions:

Leg length discrepancies of 2 cm or more induce significant biomechanical changes in hip joint loading.
These changes disproportionately affect the shorter leg, increasing stress.
The observed alterations in joint load may contribute to long-term musculoskeletal problems.