The 3 essential criteria for evaluating stability in a running shoe are: heel counter rigidity, forefoot flexion stability and torsional rigidity.
In many cases, you can correlate a flaw in the current running shoe that may have contributed to your current injury or condition.
For example, plantar heel pain syndrome is commonly associated with shoes that have poor torsional rigidity.
Heel Counter Rigidity
The heel counter is designed to help support the rearfoot during walking and running. A stiff heel counter will provide a greater amount of support and is an important feature of the shoe to prevent foot pronation. The stiffness of the heel counter can be evaluated by placing the shoe in the palm of one hand and with the thumb and finger of the opposite try to squeeze the heel counter
Forefoot Flexion Stability
This test is performed by holding the shoe at opposite ends and bending. The shoe should only bend at the ball of the foot. If the shoe bends in the middle it will provide less stability.