Authors: Adeel Aqil Roshan Drabu Jeroen H Bergmann Milad Masjedi Victoria Manning Barry Andrews Sarah K MuirheadAllwood Justin P Cobb
Publish Date: 2013/02/27
Volume: 37, Issue: 5, Pages: 795-801
Abstract
Post arthroplasty gait analysis has up till now been performed on subjects walking slowly on flat ground rather than challenging them at faster speeds or walking uphill We therefore asked 1 Is there a measurable difference in the performance of hip resurfacing arthroplasty HRA and total hip arthroplasty THA limbs at patients’ selfdetermined fastest walking speeds and steepest inclines and 2 Is there a relationship between the observed differences between the gait of HRA and THA implanted limbs and patient walking speeds and inclinesIn an ethically approved study we recruited patients with bilateral hip arthroplasties one HRA and one THA Nine subjects were assessed using an instrumented treadmill at a range of speeds and inclines by a blinded observer The ground reaction forces of subjects were recorded and an age sex and BMI matched control group was used for comparisonIncreasing walking speed correlated strongly with between leg differences in weight acceptance r = 09 p = 0000 and pushoff force r = 079 p = 0002 HRA implanted limbs accepted significantly more weight at top walking speeds 1208 N ± 320 versus 1279 N ± 370 p = 0026 and pushed off with greater force when walking uphill 818 N ± 163 versus 855 ± 166 p = 0012 HRA limbs more closely approximated to the gait of the normal control group
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