ASSESSMENT OF HIP MOVEMENT WHEN RETRIEVING AN OBJECT FROM THE FLOOR

Introduction: Activities that require extreme hip movement can dislocate hip implants in the early post operative phase. The aim of this study was to assess the movement of the hip using four different techniques to retrieve an object from the floor.Methods: An electromagnetic tracker was used to measure hip movement during these retrieval techniques:-Flexing forward to pick up an object between the feetStanding to the side of the object and bendingSquatting to pick up an object between the feetKneeling on one knee to pick up.Measurements were taken from 50 hips in 25 normal subjects aged 21 to 61. Sensors were attached over the iliac crest and the mid-shaft of the lateral thigh. Data was collected as each technique was repeated 3 times. The tracker recorded hip flexion and rotation data at 10 hertz, with an accuracy of 0.15 degree.Results: For each of the four techniques the respective mean (SD) movements were:-Flexion: 75.8(28.6), 79.2(27.2), 87.5(29.7) and 30.4(17.3).Extension: −0.2(2.5), 0.5(1.9), 0.1...