问题
单项选择题
A client seeks care for low back pain of 2 weeks’ duration. Which assessment finding suggests a herniated intervertebral disk（）
A. Pain that radiates down the posterior thigh.
B. Back pain when the knees are flexed.
C. Atrophy of the lower leg muscles.
D. Positive Homans’ sign.
答案
参考答案：A
解析：
Disk herniation may compress spinal nerve roots, causing sciatic nerve inflammation, which produces pain that radiates down the leg. Slight knee flexion should relieve lower back pain. If nerve root compression remains untreated, weakness or paralysis of the innervated muscle group may result; lower leg atrophy may occur if muscles aren’t used. Positive Homans’ sign is more indicative of phlebothrombosis.