Klein's line

Klein's Line is a radiographic reference line used in the field of orthopedics to diagnose hip dysplasia and slipped capital femoral epiphysis (SCFE). It was named after Arne Klein, a Swedish orthopedic surgeon who first described it in 1952.

Description

Klein's Line is drawn along the superior border of the femoral neck on an anteroposterior radiograph of the hip. A perpendicular line is then drawn from the lateral edge of the femoral neck. In a normal hip, the epiphysis of the femoral head should intersect this line. If the epiphysis does not intersect Klein's Line, it suggests a diagnosis of SCFE.

Clinical Significance

Klein's Line is a valuable tool in the early detection of SCFE, a condition that typically affects adolescents and can lead to long-term complications such as osteoarthritis if not promptly treated. It is also used to assess the severity of hip dysplasia, a condition characterized by a malformation of the hip joint that can cause pain and mobility issues.

Limitations

While Klein's Line is a useful diagnostic tool, it is not without limitations. It relies on the quality of the radiograph and the correct positioning of the patient. Furthermore, it is less reliable in younger children due to the ongoing development of the hip joint.

See Also

• Orthopedics
• Hip dysplasia
• Slipped capital femoral epiphysis
• Osteoarthritis

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