Article

The objective was to analyze the compensatory effect of the pelvis and lower
extremities on sagittal spinal malalignment in patients with pelvic incidence
(PI) and lumbar lordosis (LL) mismatch. A series of parameters including PI, LL,
PI-LL, thoracic kyphosis (TK), pelvic tilt (PT), sacral slope (SS), knee flexion
angle (KFA), tibial obliquity angle (TOA), femoral obliquity angle (FOA), femur
pelvis angle (FPA) and pelvic shift (PS) were measured. Patients with PI-LL
mismatch were divided into pelvic retroversion group and pelvic retroposition
group based on their PT and PS, and then the parameters were compared within the
two groups and with the control group. All variables were significantly different
when comparing the pelvic retroversion and retroposition group with the control
group except for PI, FOA and PS in the pelvic retroversion group. The pelvic
retroposition group had significantly greater value of PI-LL, PI, PT, KFA, FOA
and PS and contribution ratio of FOA and PS, and smaller value of LL, TK and FPA
and contribution ratio of PT, TOA and FPA compared with the pelvic retroversion
group. Patients with lesser PI-LL mismatch rely more on hip extension to increase
pelvic retroversion while those with greater PI-LL mismatch tend to add extra
femoral obliquity. When compensating for larger PI-LL mismatch, the importance of
hip extension is decreased and the effect of the knee and ankle joint becomes
more important by providing greater femoral incline and relatively lesser ankle
dorsiflexion respectively.
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Langue : ANGLAIS