Angle of the neck of femur to shaft is –
**Core Concept**
The angle of the neck of femur to the shaft, also known as the angle of inclination, is a critical anatomical parameter in orthopedics and trauma surgery. It is essential to understand this angle to diagnose and manage various femoral neck fractures and hip disorders.
**Why the Correct Answer is Right**
The angle of inclination of the femoral neck is approximately 120-130 degrees in adults. This angle allows for optimal distribution of weight-bearing forces across the hip joint, minimizing stress on the femoral head and neck. The femoral neck's inclination is influenced by the shape of the femoral head and the surrounding bone structure. The acetabulum's shape and the ligamentum teres also play a role in maintaining the femoral neck's angle.
**Why Each Wrong Option is Incorrect**
* **Option A:** This option is likely incorrect as the angle of inclination is not typically measured in degrees less than 100.
* **Option B:** This option may be a distractor, as the angle of inclination is not typically measured in degrees greater than 140.
* **Option C:** This option could be a distractor, as the angle of inclination is not typically measured in degrees less than 110.
**Clinical Pearl / High-Yield Fact**
The angle of inclination of the femoral neck is a crucial factor in the diagnosis and management of femoral neck fractures, particularly in the elderly population. A decreased angle of inclination may increase the risk of femoral neck fractures.
**Correct Answer: C. 125 degrees**