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OVER 98% PASS RATE FOR THE NCS, PCS, OCS, AND GCS EXAMS › forums › NCS Advantage › Wheelchair modification question › Reply To: Wheelchair modification question March 9, 2023 at 11:02 am #489050 Chrissy Durrough LuggeKeymaster Hi Jean, Seat depth should not need to be adjusted to accommodate the fixed posterior pelvic tilt. The other exam questions related to seat depth are reinforcing the idea that too deep of a seat can cause posterior pelvic tilt. Here is a link that provides a little more information about PPT in seating: https://hub.permobil.com/blog/posterior-pelvic-tilt-the-correction-of-sacral-sitting Hope this helps! Chrissy