Gait Analysis Of Metal On Metal Surface Arthroplasty
Poster Board Number: P050
Location: McCormick Place Hall B
Adult Reconstruction Hip
Phillip Ragland, MD Washington DC (n)
Anil Bhave, MS Baltimore MD (n)
Roland Starr, MS Baltimore MD (n)
Michael A Mont, MD Baltimore MD (a, e – Wright Medical Technology)
This study compared gait kinematics of resurfacing patients to normal hips,
osteoarthritic hips, and patients with standard hip replacements.
Metal-on-metal resurfacing is a type of hip arthroplasty in which there is
conservation of the proximal femur. Little is known about the functional
capabilities of patients with resurfacing. This study compared gait parameters
of resurfacing patients with normal and osteoarthritic hip patients as well as
those with standard hip replacements.
Utilizing a gait analysis laboratory, the authors compared temporal-spatial
parameters and hip kinematics during walking in patients with unilateral
osteoarthritic hips, unilateral standard total hip replacements, and unilateral
total hip resurfacing arthroplasty (Forty-one total patients; 15 standard total
hip replacements, 15 resurfacing, and 11 unilateral hip osteoarthritis).
Inclusion criteria for surgical patients included Harris Hip Scores > 90 points
and be minimum twelve months post-operative. All patients had gait analysis and
the data compared to a matched for age and gender normal hip population. The
gait parameters assessed included abduction moment, extensor moment, and walking
speed.
Superior hip kinematics were found when resurfacing was compared to standard hip
arthroplasty as well as osteoarthritic patients. Resurfacing patients had
kinematics (abduction moments, extension moments, walking velocity) that
approached the normal patients without hip osteoarthritis. Deficits of patients
with resurfacing were small.
Resurfacing patients had gait characteristics that were comparable to normal
hips. Although standard hip replacements had markedly improved gait parameters
when compared to osteoarthritic hips they never approached resurfacing or
normals. The reasons for these findings are unexplained but may be due to the
large femoral head which deserves further investigation.
If noted, the author indicates something of value received:
Current as of 24/February/2006 by IS
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