| Construct validity and reliability of the supine-to-sit test and prone knee bend test for the assessment of innominate rotational asymmetry in sacroiliac dysfunction |
| Paper ID : 1094-ISCSR3 (R1) |
| Authors |
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Afaf Mohamed Tahoon1, Nayera Mahmoud Elsayed2, Mostafa Ashraf Gnedy2, Omar Abdullah Saeed2, Mohammad Ehab Taha2, Weam Mohammed El-Bohy2, Mahmoud Khaled Mohammed *3 1lecturer at physical therapy for orthopedics department, Cairo university 2B.Sc. student at Physical Therapy Cairo University 3Faculty of Physical Therapy at Cairo University |
| Abstract |
| Background: Sacroiliac joint dysfunction (SIJD) could be a common source of low back pain manifested as altered mechanics and malalignment including innominate rotational asymmetry (IRA). Despite the routine clinical tests of IRA, no study evaluated the concurrent validity of these tests. In addition, inconsistency in inter-rater reliability and no adequate data on the intra-rater reliability of these tests Objective: Aims to evaluate the construct validity and intra- and inter-rater reliability of the supine-to-sit test (STST) and prone knee bend test (PKBT). Methods: Twelve SIJD of both genders with a mean age of 20 ±1.5 yrs participated in the study. The assessment team consisted of 6 independent researchers who were blinded to each other’s findings. Measurements were conducted in the same place on two separate days, with an interval ranging from 5 to seven days. On the first day, inter-rater reliability and construct validity were assessed. Intra-rater reliability was evaluated on the second day. Pelvic inclinometer was a reference standard for the construct validity with a cutoff score of 1° to detect IRA. This study followed the Guidelines for Reporting Reliability and Agreement Studies. Statistical analysis was performed using agreement percentage and kappa statistics. Results: The construct validity was determined for STST (58.3% agreement; K=0.16; p=0.5) and PKBT (50% agreement; K=0.07; p=0.7). The intra-rater reliability was determined for STST (75% agreement; K=0.5; p<0.05) and PKBT (66.6% agreement; K=0.33; p=0.276). The inter-rater reliability was determined for STST (66.6% agreement; K=−0.33 p=0.221) and PKBT (58.3% agreement; K=0.11; p=0.67). Conclusion: Both STST and PKBT did not confirm the construct validity. STST was reliable when performed by the same rater with a good percentage of agreement. However, as a rule of thumb, any kappa < 0.60 indicates inadequate and little confidence. The findings do not support STST or PKBT in identifying innominate asymmetry in SIJD. |
| Keywords |
| Keywords: sacroiliac joint dysfunction (SIJD), innominate rotational asymmetry, pelvic torsion, supine to sit test (STST), prone knee bend test (PKBT) |
| Status: Abstract Accepted |