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Fig. 4 | BMC Musculoskeletal Disorders

Fig. 4

From: Joint motion of bipolar hemiarthroplasty in routine hip functional movements: a dynamic motion study

Fig. 4

Motion distributions in 4 subgroups during the 4 motion examinations. *: There were no significant differences in the mean total motion among the groups during each specific examination, except that in Group C was larger than that in Group B during the weight-bearing simulative squat examination (57.18° vs. 43.22°, P = 0.017). We believe that these differences may be due to individual differences across the enrolled patients. In cases where acetabular protrusion is absent, acetabular wear may change the behaviour of the bipolar prosthesis but may not significantly affect the normal range of motion of the hip. a. During non-weight-bearing abduction-adduction, the degrees of motion of the outer bearing were 32.44, 24.46, 30.49 and 33.79 in Groups A, B, C and D, respectively; the degrees of motion of the inner bearing were 3.03, 4.84, 5.28 and 5.67 in Groups A, B, C and D, respectively. b. During non-weight-bearing flexion-extension, the degrees of motion of the outer bearing were 62.93, 57.35, 54.89 and 54.66 in Groups A, B, C and D, respectively; the degrees of motion of the inner bearing were 4.62, 15.51, 19.18 and 10.16 in Groups A, B, C and D, respectively. c. During the weight-bearing simulative squat motion, the degrees of motion of the outer bearing were 45.59, 39.84, 44.19 and 47.09 in Groups A, B, C and D, respectively; the degrees of motion of the inner bearing were 1.66, 3.38, 12.99 and 7.35 in Groups A, B, C and D, respectively. d. During the weight-bearing normal gait motion, the degrees of motion of the outer bearing were 33.89, 14.09, 7.49 and 16.32 in Groups A, B, C and D, respectively; the degrees of motion of the inner bearing were 4.41, 22.89, 32.31 and 26.36 in Groups A, B, C and D, respectively

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