Structure and Function in Normal and Abnormal Hips

The book describes a new approach to the evaluation of x-rays of normal and mechanically abnormal hips, allowing visualisation of the forces responsible for their physiological function or pathological decay. Bone with its high perception to stress reacts with apposition or demolition, thanks to its cabled structure of collagenous fibres which form a frame around cavities created by the hydrostatic pressure. Bone is a pneumatic structure, a modern tyre, the best supporting construction. It can be maintained or promoted when: 1. The forces act perpendicularly to the plane of action; 2. The amount of stress is adequate to produce its elastic deformation; 3. Vascularity is preserved. Knowledge of the above-mentioned principles helps the reader to understand why, when, how and which surgical procedure is indicated.