Postural balance during quiet standing in patients with total hip arthroplasty with large diameter femoral head and surface replacement arthroplasty.
OBJECTIVE
To compare postural balance between patients who have had either a large diameter head total hip arthroplasty or surface replacement arthroplasty.


METHODS
Observational study.


METHODS
Outpatient biomechanical laboratory.


METHODS
Two groups of 14 patients with surface replacement or large diameter head total hip arthroplasties recruited from a larger randomized study and 14 control subjects.


METHODS
Not applicable.


METHODS
Postural balance during quiet standing in dual and one-leg stance (operated leg), hip abductor muscle strength, clinical outcomes, and radiographic analyses were compared between groups.


RESULTS
Compared to the control group, patients in both groups showed smaller center of pressure displacement amplitude in the medial-lateral direction in dual stance. Patients with large diameter head total hip arthroplasty showed lower hip abductor muscle strength compared to control subjects. There was statistical difference between the 2 patient groups in biomechanical reconstruction of the hip. Despite these differences, there was no significant difference in the ability to complete the one-leg stance task between the 3 groups.


CONCLUSIONS
The muscular strength in the operated limb could be mainly responsible for the lower center of pressure displacement amplitude compared to control subjects. However, the ability to complete the one-leg stance demonstrates that patients do not fear to load the hip prosthesis when needed. The large diameter femoral head may be a major mechanical factor contributing to these results.
Nantel
Julie
J
Department of Kinesiology, University of Montreal, Montreal, Canada.
Termoz
Nicolas
N
Ganapathi
Muthu
M
Vendittoli
Pascal-André
PA
Lavigne
Martin
M
Prince
François
F
D000328:Adult; D019644:Arthroplasty, Replacement, Hip / Q000379:methods* / Q000534:rehabilitation*; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D053580:Muscle Strength; D004856:Postural Balance