1. Torsional abnormalities;LaPorta;Arch Podiatr Med Foot Surg,1973
2. Pediatric orthopedics of the lower extremity;McCrea,1985
3. A compendium of podiatric biomechanics;Sgarlato,1971
4. Persistent frontal alignment of the hip;Sommerville;J Bone Joint Surg Br,1957
5. Femoral torsion and its relation to toeing-in and toeing-out;Crane;J Bone Joint Surg,1959