Article

Several studies have investigated walking characteristics in hip
dysplasia patients, but so far none have described all hip rotational degrees of
freedom during the whole gait cycle. This descriptive study reports 3D joint
angles and torques, and furthermore extends previous studies with muscle and
joint contact forces in 32 hip dysplasia patients and 32 matching controls.
METHODS: 3D motion capture data from walking and standing trials were analysed.
Hip, knee, ankle and pelvis angles were calculated with inverse kinematics for
both standing and walking trials. Hip, knee and ankle torques were calculated
with inverse dynamics, while hip muscle and joint contact forces were calculated
with static optimisation for the walking trials. RESULTS: No differences were
found between the two groups while standing. While walking, patients showed
decreased hip extension, increased ankle pronation and increased hip abduction
and external rotation torques. Furthermore, hip muscle forces were generally
lower and shifted to more posteriorly situated muscles, while the hip joint
contact force was lower and directed more superiorly. CONCLUSION: During walking,
patients showed lower and more superiorly directed hip joint contact force, which
might alleviate pain from an antero-superiorly degenerated joint.
CI - Copyright (c) 2015 Elsevier B.V. All rights reserved.

Langue : ANGLAIS