Clinimetric properties of the knee extension prone test (KEPT): A new method to assess knee hyperextension deficit

Abstract

Introduction: The knee extension prone test (KEPT) can be a low-cost and affordable alternative for this assess knee hyperextension deficit.

Objective: To analyze concurrent validity and reliability of a new method for assessing knee extension prone (knee extension prone test; KEPT).

Methods: Participants were divided into two groups: Group 1 comprised healthy participants (HG) and Group 2 comprised participants with a history of knee injury (IG). Two examiners performed the following evaluations: (1) lateral knee goniometry, (2) anterior tibial inclinometry, (3) lateral photogrammetry in supine, (4) lateral photogrammetry in prone, and (5) KEPT. Concurrent validity was analyzed by Pearson's linear correlation coefficient (r), and intra- and inter-examiner reliability were analyzed by intraclass correlation coefficient (ICC).

Results: KEPT demonstrated good intra-examiner (ICC = 0.85, 95% CI = 0.75-0.89) and excellent inter-examiner (ICC = 0.92, 95% CI = 0.88-0.94) reliability. The standard error of measurement was 0.47° and 1.30° and the minimum detectable change was 2.35° and 6.5° for intra- and inter-examiner agreement, respectively. Concurrent validity of KEPT ranged from moderate to good (r = 0.54-0.78, p < 0.01).

Conclusion: KEPT is a valid and reliable method for assessing knee hyperextension deficit in both healthy individuals and patients with knee injuries.

Keywords: Joint range of motion; Knee joint; Patient outcome assessment; Validity and reliability.