AMPUTATIONS OF THE LEG

Leg amputations due to defective arterial circulation.

Defective arterial circulation in our latitudes is the cause of 80-90 per cent of all leg amputa t ions . This figure has almost tripled during one generation, and continues to rise in spite of all the success of conservative and operative treat­ ment, particularly vascular surgery. A com­ parison with other countries shows that this percentage varies directly with the s tandard of living of th...

Amputations for Critical Leg Ischaemia -vascular Prevention and Outcome

Dynamic stability of running: the effects of speed and leg amputations on the maximal Lyapunov exponent.

In this paper, we study dynamic stability during running, focusing on the effects of speed, and the use of a leg prosthesis. We compute and compare the maximal Lyapunov exponents of kinematic time-series data from subjects with and without unilateral transtibial amputations running at a wide range of speeds. We find that the dynamics of the affected leg with the running-specific prosthesis are ...

Lower Prosthetic Stiffness Minimizes the Metabolic Cost of Running for Individuals with Bilateral Leg Amputations

Non-amputee runners increase leg stiffness (kleg) and decrease contact time (tc) to achieve faster running speeds [1, 2]. Kram and Taylor [3] suggest that longer tc reduces the rate of muscular force production, thereby facilitating the recruitment of slower more economical muscle fibers which decreases the energetic cost of running. Thus, it is likely that a lower kleg (and longer tc) reduces ...

Nonlinear dynamics of running: Speed, stability, symmetry and the effects of leg amputations

In this paper, we study dynamic stability during running, focusing on the effects of speed and the use of a leg prosthesis. We compute and compare the maximal Lyapunov exponents of kinematic time-series data from subjects with and without unilateral transtibial amputations running at a wide range of speeds. We find that the dynamics of the affected leg with the runningspecific prosthesis are le...