Question 54

Hyperextension of the lumbar spine occurs when a person bends backward.

Hyperextension of the lumbar spine specifically refers to a movement where the spine extends beyond its normal range, typically achieved by bending backward.

A) bends forward

Bending forward results in flexion of the lumbar spine, which is the opposite of hyperextension. This movement decreases the angle between the upper body and thighs, thereby not contributing to hyperextension.

B) bends backward

Bending backward is the correct action that leads to hyperextension of the lumbar spine. This movement increases the angle between the thighs and the upper body, causing the back to arch beyond its neutral position.

C) bends to the side

Bending to the side involves lateral flexion of the lumbar spine, which does not constitute hyperextension. This movement shifts the spine laterally rather than extending it backward.

D) twists to the left or right

Twisting to the left or right involves rotation of the lumbar spine and does not result in hyperextension. This motion alters the alignment of the spine but does not extend it backward beyond its normal range.

Conclusion

Bending backward is the definitive action that leads to hyperextension of the lumbar spine, making option B the correct choice. All other options describe movements that either flex the spine or alter its orientation without achieving hyperextension, thereby failing to address the core concept of the question.