dear Spandan,
It is not that easy, there are a number of factors causing the crouch gait. It is often the only way a person can stay upright and it costs a lot of energy. If you can change it??
The book is not available in Spain as wel but you can order it on line and it is sent all over the world. go to
Lippincott Williams & Wilkins Home Page It is really worth buying.
kind regards
Esther