Energy storing and return prosthetic feet improve step length symmetry while preserving margins of stability in persons with transtibial amputation.

The study included only 15 men, all with traumatic transtibial amputation and K3 level activity, so it may not apply to women, less active users, or other amputation causes or levels. Only one ESAR foot, the Variflex, was tested, so the result may not transfer to other ESAR feet. Walking was tested at a fixed 1.2 m/s in a lab, not at self-selected speed or in daily conditions, so the finding is a controlled mechanical comparison. Participants had only 24 hours of daily use with the SACH foot before testing, and lack of SACH acclimation cannot be ruled out. The reported outcomes were mechanical gait measures, and the paper does not present patient-reported function or fall outcomes. The study cannot separate the effect of push-off power from roll-over shape. Imperfect socket fit or alignment could affect step length and symmetry, although the same socket was used and a certified prosthetist aligned the SACH foot.

Do not conclude that ESAR feet improve daily walking safety or reduce falls. The study showed a lab change in step length symmetry and no difference in backward margin of stability at toe-off in 15 active men walking at a fixed speed.