doi:10.1016/j.msksp.2020.102225engEstébanez-de-Miguel, E.Caudevilla-Polo, S.González-Rueda, V.Bueno-Gracia, E.Pérez-Bellmunt, A.López-de-Celis, C.Ultrasound measurement of the effects of high, medium and low hip long-axis distraction mobilization forces on the joint space width and its correlation with the joint strainART-2020-119855Background: No study has evaluated the mechanical effect of different magnitudes of long axis-distraction mobilization (LADM) force on hip joint space width (JSW) or the association between the separation of joint surfaces and the strain on hip capsular ligaments. Objective: To compare the joint separation when applying three different magnitudes of LADM forces (low, medium and high) and to analyse the correlation between joint separation, strain on the inferior ilio-femoral ligament and magnitude of applied force. Design: Repeated measures controlled laboratory cadaveric study. Methods: Three magnitudes of force were applied to 11 cadaveric hip joints (mean age 73 years). Ultrasound images were used to measure joint separation, and strain gauges recorded inferior ilio-femoral ligament strain during each condition. Results: The magnitude of joint separation was significantly different between low (0.23 ± 0.19 mm), medium (0.72 ± 0.22 mm) and high (2.62 ± 0.43 mm) forces (p < 0.001). There were significant associations between magnitude of force, joint separation and the strain on the inferior ilio-femoral ligament during LADM (r > 0.723; p < 0.001). Conclusion: Hip joint separation and ligament strain during LADM are associated with the magnitude of the applied force.2020http://zaguan.unizar.es/record/10661810.1016/j.msksp.2020.102225http://zaguan.unizar.es/record/106618oai:zaguan.unizar.es:106618MUSCULOSKELETAL SCIENCE AND PRACTICE 50, 102225 (2020), [5 pp]by-nc-ndhttp://creativecommons.org/licenses/by-nc-nd/3.0/es/info:eu-repo/semantics/openAccess