@phdthesis{oai:hama-med.repo.nii.ac.jp:00004082,
 author = {Ma, Xin},
 month = {Feb},
 note = {doctoral, 医学系研究科, To investigate the relationship between femoroacetabular impingement (FAI) and different sitting positions. We retrospectively reviewed 24 patients with FAI. Femoral and pelvic parameters were measured, and 3D simulation software was used to create and analyze a 3D model of the hip. The data were divided into impingement and non-impingement groups according to whether impingement occurred in the normal or cross-legged sitting positions. The parameters were compared between these groups, and the effect of each parameter on impingement volume was estimated. Femoral anteversion and the difference in sacral slope (SS) between standing and sitting positions (ΔSS) were significantly lower in the impingement group than in the non-impingement group (both p<0.05). Alpha angle, sacral slope in the sitting position (sitting-SS), and femoral flexion angle (FFA) were significantly higher in the impingement group than in the non-impingement group (p<0.05, p<0.01, and p<0.05, respectively). Femoral neck shaft angle (FNSA) correlated with impingement volume in the normal sitting position (r=0.602 p<0.01). FNSA, SS, and FFA correlated with the impingement volume in the cross-legged sitting position (r=0.409, p<0.05; r=-0.438, p<0.05; r=0.420, p<0.05, respectively). Our simulation study demonstrated that, during normal and cross-legged sitting positions, FAI patients with increased sitting-SS, alpha angle, and FFA as well as decreased ΔSS and femoral anteversion were more likely to have impingement. These findings suggest that FAI patients with increased alpha angle and sitting-SS as well as decreased ΔSS and femoral anteversion should avoid excessive femoral flexion during sitting and cross-legged sitting positions.},
 school = {浜松医科大学},
 title = {The association between femoroacetabular impingement and sitting positions: A three-dimensional simulation study},
 year = {2021}
}