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Pelvic parameters. Pelvic anteversion decreases acetabulum version; pelvic retroversion increases acetabulum version; both can explain changes between standing and sitting.
Note. LL, lumbar lordosis; PI, pelvic incidence; SS, sacral slope; PT, pelvic tilt; APPt, anterior pelvic plane tilt; SFP, sacro-femoral pubic angle; AV, acetabulum version.
