23/04/2026
🏃♀️Running biomechanics: narrow step width 🏃♀️
Another behaviour commonly seen is a narrow step width (also known as cross-over gait).
This is observed from behind a runner (coronal view) and is when half (or more) of the foot striking the ground crosses over the body’s midline.
Although in part a foot placement strategy, a 2015 study showed that a narrow step width is correlated with overstriding.
Overstriding also plays a role in the increased hip adduction that we often see in conjunction with a pelvic drop (Trendelenburg’s sign) and reduced knee window (dynamic valgus).
It is not solely what happens at the knee, but what we observe happening above (proximal) and below (distal) the knee joint during the stance phase that impacts mechanical stress at the ITB insertion.
The most important thing to note with overstriding, hip drop, knee valgus and a narrow step width is that strength training alone does not resolve any of these behaviours.
Strength is important, yes. However, these are motor control issues and rely on feedback and re-training to improve.