From a medical standpoint, crank length primarily impacts the hip and knee joints. At top dead center (TDC), the hip reaches maximum flexion, and we need to generate significant force. However, working hard at a joint's extreme range isn't ideal. Shorter cranks reduce hip strain at TDC, promoting better comfort and longevity.
From a performance perspective, shorter cranks engage the quads and glutes earlier and support a more aerodynamic position. The trade-off? Slightly reduced torque, requiring a higher cadence to maintain power.
Recently, more athletes have been diagnosed with Flow-Limited Iliac Artery (FLIA)—a condition restricting blood flow to the leg, causing sharp pain and power loss. Extreme aerodynamic positioning is a suspected contributor. High-profile cyclists like Joe Dombrowski, Fabio Aru, Annemiek Van Vleuten, and Carlotta Fondriest have all been affected.
Shorter cranks might not be a universal solution, but they can help reduce joint strain and potentially lower FLIA risk—something worth considering for both comfort and performance.

SHORTER CRANKS ARE BETTER❤️

A very interesting  article on overuse injuries in cycling. Thanks to Paul Visentini, Australia and Ben Clarsen, Norway.
​http://www.aspetar.com/journal/viewarticle.aspx?id=339#.WIXkO4XXJQu