Similar to computed tomography measurements of psoas muscle area, preoperative ultrasound measurements of quadriceps depth shows promise in discriminating between frail and not-frail patients before surgery. It was also associated with skilled nursing facility admission and postoperative delirium.

A total of 32 patients and 20 healthy volunteers were included.

Frailty was identified in 18 of the 32 patients.

Receiver operating characteristic curve analysis showed that quadriceps depth and psoas muscle area are able to identify frailty, whereas the cross-sectional area of the rectus femoris is less promising.

Preoperative ultrasound measurements of the quadriceps and rectus femoris were obtained in patients with previous computed tomography scans.

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