TY - ABST

T1 - ASSESSMENT OF IN VIVO MECHANICAL MUSCLE FUNCTION IN PATIENTS WITH OSTEOARTHRITIS (OA) OF THE HIP; RELIABILITY

AU - Jensen, Carsten

AU - Overgaard, Søren

AU - Aagaard, Per

PY - 2009

Y1 - 2009

N2 - INTRODUCTIONMuscle function in patients with hip OA is not well-studied. We established a new setup of tests in order to monitor patients before and after surgery with total hip arthroplasty (THA). A test-retest protocol was designed to evaluate the reproducibility of single- and multi-joint strength and power a novel setup. MATERIAL AND METHODSIsokinetic contractions for both knee and hip muscles were performed. Reliability for isometric muscle contractions in vivo was recorded and evaluated by use of within subject variability (CVW-S), Spearman correlation and Limits of Agreement (LoA). Both explosive muscle force characteristics (Rate of force development) and maximal isometric force (MVC) were obtained for the affected (aff) and non-affected (n-aff) leg (only data MVC for affected side in this abstract). 20 patients, (age 55.9 ± 4.8; height 174 ± 8; BMI 27.1 ± 4.5) with unilateral hip OA participated in a test-retest after 8w at 10w post op.  RESULTS Table 1: Patient test - retest reliability (Maximal Isometric Muscle Torque) for aff-sideAFF-legTest (8W)Mean ± SD(Nmkg-1)Test (10W)Mean ± SD(Nmkg-1)Δmean(Nmkg-1) CVws Spearman± SE LoA Knee EXT1.32 ± 0.381.41 ± 0.35-0.09 ± 0.16-6.5 %0.88 ± 0.05-0.40 : 0.20Knee FLX0.63 ± 0.230.65 ± 0.17-0.02 ± 0.10-3.8 %0.87 ± 0.05-0.22 : 0.17Hip ADD1.28 ± 0.321.34 ± 0.37-0.07 ± 0.12-5.1 %0.93 ± 0.03-0.29 : 0.16Hip ABD1.35 ± 0.281.47 ± 0.35-0.11 ± 0.14-8.0 %0.84 ± 0.07-0.39 : 0.16Hip EXT1.86 ± 0.442.07 ± 0.57-0.20 ± 0.24-9.9 %0.82 ± 0.07-0.67 : 0.26Hip FLX1.09 ± 0.311.23 ± 0.33-0.15 ± 0.13-12.8 %0.82 ± 0.06-0.40 : 0.11 Test-retest showed good CV's for all except hip flexion.  CONCLUSIONSOur novel setup of muscle tests showed overall good CV's, which is promising for further studies on the patient group.

AB - INTRODUCTIONMuscle function in patients with hip OA is not well-studied. We established a new setup of tests in order to monitor patients before and after surgery with total hip arthroplasty (THA). A test-retest protocol was designed to evaluate the reproducibility of single- and multi-joint strength and power a novel setup. MATERIAL AND METHODSIsokinetic contractions for both knee and hip muscles were performed. Reliability for isometric muscle contractions in vivo was recorded and evaluated by use of within subject variability (CVW-S), Spearman correlation and Limits of Agreement (LoA). Both explosive muscle force characteristics (Rate of force development) and maximal isometric force (MVC) were obtained for the affected (aff) and non-affected (n-aff) leg (only data MVC for affected side in this abstract). 20 patients, (age 55.9 ± 4.8; height 174 ± 8; BMI 27.1 ± 4.5) with unilateral hip OA participated in a test-retest after 8w at 10w post op.  RESULTS Table 1: Patient test - retest reliability (Maximal Isometric Muscle Torque) for aff-sideAFF-legTest (8W)Mean ± SD(Nmkg-1)Test (10W)Mean ± SD(Nmkg-1)Δmean(Nmkg-1) CVws Spearman± SE LoA Knee EXT1.32 ± 0.381.41 ± 0.35-0.09 ± 0.16-6.5 %0.88 ± 0.05-0.40 : 0.20Knee FLX0.63 ± 0.230.65 ± 0.17-0.02 ± 0.10-3.8 %0.87 ± 0.05-0.22 : 0.17Hip ADD1.28 ± 0.321.34 ± 0.37-0.07 ± 0.12-5.1 %0.93 ± 0.03-0.29 : 0.16Hip ABD1.35 ± 0.281.47 ± 0.35-0.11 ± 0.14-8.0 %0.84 ± 0.07-0.39 : 0.16Hip EXT1.86 ± 0.442.07 ± 0.57-0.20 ± 0.24-9.9 %0.82 ± 0.07-0.67 : 0.26Hip FLX1.09 ± 0.311.23 ± 0.33-0.15 ± 0.13-12.8 %0.82 ± 0.06-0.40 : 0.11 Test-retest showed good CV's for all except hip flexion.  CONCLUSIONSOur novel setup of muscle tests showed overall good CV's, which is promising for further studies on the patient group.

M3 - Conference abstract in proceedings

BT - Proceedings Årsmøde 2009 Dansk Ortopædisk Selskab

Y2 - 29 April 2009 through 1 May 2009

ER -