When positioning a client with a herniated lumbar intervertebral disk for bed rest in Williams' position, the bed should be in which position?

When positioning a client with a herniated lumbar intervertebral disk for bed rest in Williams' position, the appropriate choice involves placing the client in semi Fowler's position with the knees slightly flexed. This position is beneficial as it helps to relieve pressure on the lumbar spine by facilitating a slight flexion of the hips and knees, which encourages relaxation of the lumbar muscles and reduces tension on the intervertebral disks.

The semi Fowler's position allows for proper alignment of the spine, promoting comfort and decreasing pain associated with herniated disks. Slight flexion at the knees helps take pressure off the lower back, while the semi upright angle can assist in lung expansion and prevent respiratory complications during prolonged bed rest.

In contrast, a flat position with knees straight could place undue stress on the lumbar region, exacerbating discomfort. A sitting position with legs extended would not support spinal alignment and could worsen pain by increasing pressure on the lumbar discs. A prone position with legs straight is also not advisable, as it can strain the lumbar spine and may lead to increased discomfort for the client. Therefore, the chosen position effectively supports the client's comfort and recovery.