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The femur is the body's longest and strongest bone spanning the thigh region. Its head articulates with the acetabulum of the hip bone to form the hip joint. A minor indentation on the medial side of the femoral head, called the fovea capitis, serves as the site of attachment for the ligament of the head of the femur. This weak ligament spans the femur and acetabulum and supports the hip joint. The narrowed region below the head is the neck of the femur. The inclination angle between the...
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Lower Limb Biomechanical Analysis of Healthy Participants
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Biomechanical Consequences of Motion-Restricting Lower Extremity Orthoses.

Callan W Heise, Ryan J Farris

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    Summary

    Using locked knee-ankle-foot orthoses (KAFO) and rigid ankle-foot orthoses (AFO) significantly increases gait compensations and asymmetry. Hip hiking was the most common strategy observed in this motion-capture study.

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    Area of Science:

    • Biomechanics
    • Orthotics and Prosthetics
    • Gait Analysis

    Background:

    • Gait biomechanics are significantly altered by lower extremity orthoses.
    • Understanding these changes is crucial for optimizing orthotic design and patient outcomes.

    Purpose of the Study:

    • To quantify gait biomechanical changes associated with locked knee-ankle-foot orthoses (KAFO) and rigid ankle-foot orthoses (AFO).
    • To compare compensatory motions and temporospatial symmetry across different bracing conditions.

    Main Methods:

    • Motion-capture technology was employed to analyze gait in six able-bodied subjects.
    • Subjects were tested under four conditions: unbraced, locked knee orthosis, KAFO, and AFO.

    Main Results:

    • All braced conditions showed significant increases in compensatory motions and gait asymmetry.
    • The KAFO condition exhibited the most substantial changes in gait.
    • Hip hiking was the predominant compensatory strategy, followed by circumduction and vaulting.

    Conclusions:

    • Lower extremity bracing, particularly KAFOs, necessitates significant gait adaptations.
    • The findings provide a quantitative basis for evaluating and designing future orthotic technologies.
    • The described methodology can guide future assessments of gait in braced individuals.