STUDY DESIGN: Radiographic review of healthy volunteers. PURPOSE: To determine the ideal sitting positions by measuring changes in lumbar @entity1515 (LL) and pelvic parameters (PPs) in various positions. OVERVIEW OF LITERATURE: Prolonged sitting is generally accepted as an important risk factor for @entity1643 ( @entity1643 ). It is now recognized that spinopelvic alignment is important for maintaining an energy-efficient posture. METHODS: Lateral spine radiographs of thrirty healthy volunteers (male @entity1 ) were taken in standing and five sitting positions. Radiographic measurement of LL and PPs was performed in each position. Statistical analysis was performed to identify a correlation between changes in the LL and PPs in each positions. RESULTS: LL in standing was 48.5    8.7  . Sitting significantly decreased LL and segmental angle when compared with standing (p<0.05). The lower lumbar segmental angles (L4-5 and L5-S1) significantly decreased in all sitting positions (p<0.05), but the decrease was relatively less on the chair with lumbar support and in the 90  -angled chair. The sacral slope (SS) decreased and the pelvic tilt increased with decreasing LL in the sitting positions. CONCLUSIONS: Sitting causes a reduction in LL and SS when compared with standing. It might cause a spinopelvic imbalance and result in chronic @entity1643 . Our study showed that sitting on a chair with back support induced minimal changes to LL. Consequently, it is proposed that sitting on a chair with back support would be a much more ideal position than sitting on other types of chairs.

The Effect of Standing and Different Sitting Positions on Lumbar XXXX : Radiographic Study of 30 Healthy Volunteers.

@entity1 :: ('9606', 'Species') :: ['participants'] @entity1643 :: ('MESH:D017116', 'Disease') :: ['LBP', 'low back pain'] @entity1515 :: ('MESH:D008141', 'Disease') :: ['lordosis']
@entity1515 :: (MESH:D008141,Disease) :: ['Lordosis']
