|Beitragstitel||Hip range of motion examination is reliable and reproducible using Gyrosensor-based examination tool|
Introduction: Femoroacetabular Impingement (FAI) is a known cause for hip pain in young and active patients. Typically range of motion (ROM) is limited in patients with FAI. Limited Flexion and limited internal rotation are common findings in patients with FAI and should be improved after successful treatment for FAI.
Low interobserver reproducibility is a known problem in orthopedic goniometer-based ROM examinations
Therefore, we intended to validate an Gyrosensor-based examination tool to perform more reliable and reproducible ROM examinations in patients with FAI between two independent observers.
Aims: (1) What is the reliability in terms of mean difference?
(2) What is the reproducibility in terms of mean difference for two different timepoints?
(3) What is the correlation between two independent observers ?
Preoperative prospective hip range of motion examination was performed in 51 patients (97 hips ) with FAI or hip dysplasia. Mean age was 28 +/- 9 (18 – 55) years and 37 patients had an anterior FAI, 9 patients had posterior FAI and 5 patients had hip dysplasia.
All examinations were performed by two independent observers with minimum 1 year of experience in hip examination.
All examinations included assessment of flexion, extension, internal rotation in 90° of flexion, external rotation in 90° of flexion, internal rotation in extension, external rotation in extension.
A subset of 10 patients (20 hips) were examined at two different time points for interobserver reproducibility.
For interobserver Reliability and correlation we included total of 117 hip range of motion examinations.
Spearman correlation coefficient was used.
(1) Reliability in terms of mean differences for two examinators were1.4° for flexion, 1.2° for extension, ,2.8° for External rotation in 90° of flexion, 0.8° for internal rotation in 90° of Flexion ,
(2) Reproducibility in terms of mean difference for two examinators at two different timepoints were 0.5 +/ 0.1- for flexion, 1.5 +/- 1.4 for extension, 3+/- 1 for external rotation in extension and 2 +/- 0.5 for internal rotation in extension. Correlation between two different timepoints was 0.95 (p<0.001)
(3) Correlation coefficient between two independent observers was 0.91 (p<0.001) for all ROM parameters of a total of 117 examinations.
We found a excellent correlation and good reliability and reproducibility for Gyrosensor based examination tool and present an alternative to Goniometer-based examinations.