This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Anatomy of Bone & Fracture Healing, Subject name: Orthopaedics
Insal-Salvati index is used for - 
Select and explain. 
A. Olecranon, B. Patella, C. Talus, D. Scaphoid
B: Patella
Answer: B: Patella 
Explanation: Ans. is 'b' i.e., Patella o Two radiological indices are commonly used for determining the position of patella -Insall-Salvati indexIt is the ratio of patellar tendon length to patella length.Normally it is TO.An index of T 2 or more is seen in patella alta (high riding patella).An index of 0*8 or less is seen in patella baja (low lying patella).Blackbume-Peel lindexIt is the ratio of (i) the distance of tibial plateau to inferior articular surface of patella (numerator), to (ii) length of articular surface of patella (denominator).Normally it is 0-8.An index of 1 or more is seen in patella alta.