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. 2011:2011:586412.
doi: 10.1155/2011/586412. Epub 2011 Sep 18.

Center of Mass Compensation during Gait in Hip Arthroplasty Patients: Comparison between Large Diameter Head Total Hip Arthroplasty and Hip Resurfacing

Vicky Bouffard  1 , Julie Nantel, Marc Therrien, Pascal-André Vendittoli, Martin Lavigne, François Prince
Affiliations

Center of Mass Compensation during Gait in Hip Arthroplasty Patients: Comparison between Large Diameter Head Total Hip Arthroplasty and Hip Resurfacing

Vicky Bouffard et al. Rehabil Res Pract. 2011.

Abstract

Objective. To compare center of mass (COM) compensation in the frontal and sagittal plane during gait in patients with large diameter head total hip arthroplasty (LDH-THA) and hip resurfacing (HR). Design. Observational study. Setting. Outpatient biomechanical laboratory. Participants. Two groups of 12 patients with LDH-THA and HR recruited from a larger randomized study and 11 healthy controls. Interventions. Not applicable. Main Outcome Measures. To compare the distance between the hip prosthetic joint center (HPJC) and the COM. The ratio (R(HPJC-COM)) and the variability (CV(HPJC-COM)) were compared between groups. Hip flexor, abductor, and adductor muscle strength was also correlated between groups while radiographic measurements were correlated with the outcome measures. Results. In the frontal plane, HR shows less variability than healthy controls at push-off and toe-off and R(HPJC-COM) is correlated with the muscle strength ratios (FR(ABD)) at heel contact, maximal weight acceptance, and mid stance. In the sagittal plane, LDH-THA has a higher R(HPJC-COM) than healthy controls at push-off, and CV(HPJC-COM) is significantly correlated with FR(FLEX). Conclusions. One year after surgery, both groups of patients, LDH-THA and HR, demonstrate minor compensations at some specific instant of the gait cycle, in both frontal and sagittal planes. However, their locomotion pattern is similar to the healthy controls.

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Figures

Figure 1
Figure 1
Prostheses evaluation in this study. (a) Total hip arthroplasty (THA), (b) surface replacement arthroplasty (HR), and (c) large diameter femoral head (LDH-THA).
Figure 2
Figure 2
Radiographic measurement. (a) horizontal center of rotation (HCOR), (b) vertical center of rotation (VCOR), (c) femoral offset (FOFFSET), and (d) leg length (LL).
Figure 3
Figure 3
Illustration for the RHPJC-COM in the frontal plane.
Figure 4
Figure 4
Vertical ground reaction forces during normal gait. Heel contact (HC), maximal weight acceptance (MWA), mid stance (MS), Push-off (PO), and Toe off (TO).
Figure 5
Figure 5
Mean RHPJC-COM in the frontal plane for LDH-THA, HR, and healthy controls at five instants of the gait cycle.
Figure 6
Figure 6
Mean CVHPJC-COM in the frontal plane for LDH-THA, HR, and healthy controls at five instants of the gait cycle.
Figure 7
Figure 7
Mean RHPJC-COM in the sagittal plane for LDH-THA, HR, and healthy controls at five instants of the gait cycle.
Figure 8
Figure 8
Mean CVHPJC-COM in the sagittal plane for LDH-THA, HR, and healthy controls at five instants of the gait cycle.
See this image and copyright information in PMC

References

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