Which of the following describes a risk when hip flexion increases due to spinopelvic limitations?

• A. impingement and dislocation
• B. infection
• C. nerve entrapment
• D. osteoporosis

Answer: (A)

The main idea is how spinopelvic motion affects hip joint mechanics. When the spine and pelvis can’t tilt and rotate together, the hip has to bend more to achieve the same amount of flexion. That extra demand causes the femoral neck to come into contact with the acetabular rim sooner, leading to impingement of the joint structures and increasing the risk of instability that could progress to dislocation. Infections, nerve entrapment, and osteoporosis aren’t direct consequences of this altered spinopelvic rhythm in the context of increased hip flexion, so they don’t describe the primary risk here.