Article

Surgery to correct cam femoroacetabular impingement (FAI) is increasingly
popular. Nevertheless, no known study has analyzed both the three-dimensional
lower-extremity joint kinematics and kinetics to quantify FAI surgical outcomes.
The purpose of this study was to determine the effects of FAI surgery on the
affected lower-extremity joint mechanics during gait by comparing the
three-dimensional hip, knee, ankle and pelvic angular displacements, as well as
the hip, knee and ankle moments and powers of preoperative and postoperative FAI
groups, and a healthy control group. Ten patients with unilateral symptomatic cam
FAI, who underwent corrective surgery using an open or combined technique,
participated in the biomechanical analysis of level walking preoperatively and
postoperatively. Thirteen healthy control subjects provided normative data.
Results showed that gait biomechanics of FAI patients did not return to normal
after surgery. Postoperatively, patients had reduced hip frontal and sagittal
plane ROM, smaller peak hip abduction and internal rotation moments, and
decreased peak hip power generation compared to the control group. Despite
reductions in hip pain, hip impairments and trends detected preoperatively,
perhaps due to modified gait patterns, persisted postoperatively. Additional
discrepancies in lower-extremity joint mechanics were observed postoperatively,
which are believed to have resulted from partial muscle impairment caused by the
surgical approaches. Further research is required to confirm the reasons for
which lower-extremity gait mechanics of FAI patients do not return to normal
following surgery. Clarifying these causes could help improve surgical techniques
and rehabilitation programs for the treatment of FAI, and thus improve surgical
outcomes.
CI - Copyright (c) 2012 Elsevier B.V. All rights reserved.

Langue : ANGLAIS