This study is conducted at Odense University Hospital(OUH) in collaboration with Institute of Clinical Biomechanics and Sport Science, University of Southern Denmark and Clinical Institute, University of Southern Denmark Aim: To evaluate the effect of implant design on postoperative total leg muscle function recovery and gait in hip replacement patients. Design: A prospective randomized controlled clinical trial where patients are randomized into (A) total hip arthroplasty surgery (THA) or (B) resurfacing total hip replacement surgery (RTHA). Pre-surgery assessment and follow-up will be conducted at 8, 26 and 52 wks post-surgery.
The project consist of three substudies: * Determination of test-retest reliability and agreement of specific mechanical muscle function variables for the patients of interest. * Evaluate the effect of implant design on postoperative mechanical muscle recovery * Evaluate the effect of implant design on postoperative gait
Study Type
INTERVENTIONAL
Allocation
RANDOMIZED
Purpose
TREATMENT
Masking
NONE
Enrollment
39
Articular surface replacement, DePuy, posterolateral approach used
Device: Biomet 28mm
Orthopaedic Research Unit, Dept. of Orthopaedic Surgery and Traumatology, Odense University Hospital, Inst. of Clinical Research - University of Southern Denmark
Odense, Denmark
Maximal muscle strength (Peak torque, Nm)
Maximal muscle strength (peak torque, Nm) during maximal voluntary unilateral knee extension-flexion (seated), hip extension-flexion, and hip adduction-abduction (standing), respectively. Both the affected (AF) and non-affected (NA) leg
Time frame: 52 wks post-surgery (primary endpoint)
Rapid force capacity (Rate of torque development, Nm/sec)
Determined as the mean tangential slope of the torque-time curve in time intervals 0-100ms (RTD100ms), 0-200ms (RTD200ms) and 0-peak (RTD peak) relative to onset of contraction (t = 0ms)
Time frame: 52 wks post-surgery (primary endpoint)
Gait parameters
Selfselected, matched and maximal speed, limb index, Gait deviation index, Movement profile analysis togeter with tempo- spatial parameters
Time frame: 26 wks post-surgery (primary endpoint)
Postural Control
Sway analysis (postural control) during two-leg standing, tandem, one-leg standing and during transistion from sit-to-stand.
Time frame: 52 wks post-surgery (primary endpoint)
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