“…Within studies comparing passive prostheses, comparing passive with quasi-passive prostheses, and comparing active with passive prostheses, physiological outcome measures (25%, n = 4 [ 54 , 60 , 64 , 80 ]; 40%, n = 4 [ 53 , 75 , 76 , 82 ] and 25%, n = 2 [ 55 , 77 ] respectively) and performance outcomes were less frequently investigated (69%, n = 11 [ 54 , 59 – 61 , 63 , 64 , 68 , 73 , 80 , 81 , 85 ]; 33%, n = 3 [ 75 , 76 , 86 ] and 63%, n = 5 respectively [ 56 – 58 , 65 , 77 ]). Within the cluster of studies comparing passive prostheses, four studies reported physiological benefits [ 50 , 52 , 55 , 58 ], and eight studies reported benefits on the performance of the novel passive prosthesis [ 54 , 59 , 61 , 63 , 64 , 73 , 80 , 81 ]. Among the studies comparing passive with quasi-passive prostheses, one study reported positive physiological effects for the quasi-passive prosthesis [ 53 ], one reported negative physiological effects [ 74 ], and one found favourable results on performance regarding the quasi-passive prosthesis [ 75 ].…”