The fall of the postural–structural–biomechanical model

by Eyal Lederman

Manual and physical therapists often use a postural–structural–biomechanical (PSB) model to ascertain the causes of various musculoskeletal conditions. It is believed that postural deviations, body asymmetries and pathomechanics are the predisposing/maintaining factors for many musculoskeletal conditions. The PSB model also plays an important role in clinical assessment and management, including the choice of manual techniques and the exercise prescribed. However, this model has been eroded by research in the last two decades introducing profound challenges to the practice of manual and physical therapy. This article examines how the sciences are challenging the PSB model, using lower back pain (LBP) as an example.