Final answer:
Klein's Line is a radiological landmark for diagnosing slipped capital femoral epiphysis (SCFE), where a positive Klein's Line indicates the presence of SCFE by failing to intersect with the lateral epiphysis.
Step-by-step explanation:
Klein's Line is a radiological landmark used in the assessment of the hip, particularly in the diagnosis of slipped capital femoral epiphysis (SCFE). A positive Klein's Line indicates the presence of SCFE. This line is drawn along the superior border of the femoral neck on an anterior-posterior pelvis X-ray. When examining an X-ray, if the Klein's Line fails to intersect with the lateral portion of the epiphysis, it is considered a positive Klein's Line, suggesting that the epiphysis has slipped posteriorly and medially relative to the femoral neck.