This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Congenital Dislocation of Hip (C.D.H.), Subject name: Orthopaedics
The abduction contracture at the hip joint is evaluated clinically by the: 
Select and explain. 
A. Thomas test, B. Gerhardt's test, C. Ober's test, D. Ely's test
C: Ober's test
Answer: C: Ober's test 
Explanation: Ans. C. Ober's testa. Ober's test determines the tightness of the fascia lata or in other words is used to determine abduction contracture of the hip. This is performed by placing the patient on the unaffected side, flexing the hip (affected) then widely abducting and extending the hip and finally allowing the thigh to drop towards the adducted position.b. When the tensor is tight, the thigh will be sustained momentarily in the abducted position before falling towards the table.