Gait efficiency using the C-Leg.

Microprocessor-controlled prosthetic knees are claimed to improve gait efficiency in transfemoral (TF) amputees. This hypothesis was tested in a prospective randomized crossover trial that compared the Mauch SNS knee and the C-Leg microprocessor-controlled knee in eight TF amputees. The subjects were given a 3-month acclimation period in each knee. Then, their net oxygen cost (mL/kg/m) was measured while they walked overground at four speeds in random order: 0.8 m/s, 1.0 m/s, 1.3 m/s, and self-selected walking speed (SSWS). The C-Leg caused small reductions in net oxygen cost that were not statistically significant compared with the Mauch SNS at any of the walking speeds (p > 0.190). Subjects chose higher SSWSs with the C-Leg compared with the Mauch SNS (mean +/- standard deviation = 1.31 +/- 0.12 m/s vs 1.21 +/- 0.10 m/s, respectively, p = 0.046) but did not incur higher oxygen costs (p = 0.270), which suggests greater efficiency only at their SSWS.

[1]  J. Perry,et al.  Energy expenditure and gait characteristics of a bilateral amputee walking with C-leg prostheses compared with stubby and conventional articulating prostheses. , 2004, Archives of physical medicine and rehabilitation.

[2]  J. Czerniecki,et al.  Rehabilitation in limb deficiency. 1. Gait and motion analysis. , 1996, Archives of physical medicine and rehabilitation.

[3]  L. M. Sheldahl,et al.  Physiological comparison of walking among bilateral above-knee amputee and able-bodied subjects, and a model to account for the differences in metabolic cost. , 1997, Archives of physical medicine and rehabilitation.

[4]  Seishi Sawamura,et al.  Effect of an Intelligent Prosthesis (IP) on the Walking Ability of Young Transfemoral Amputees: Comparison of IP Users with Able-Bodied People , 2003, American journal of physical medicine & rehabilitation.

[5]  R. Waters,et al.  Energy cost of walking of amputees: the influence of level of amputation. , 1976, The Journal of bone and joint surgery. American volume.

[6]  D Datta,et al.  Conventional versus microchip controlled pneumatic swing phase control for trans-femoral amputees: User's verdict , 1998, Prosthetics and orthotics international.

[7]  M. Devlin,et al.  Patient preference and gait efficiency in a geriatric population with transfemoral amputation using a free-swinging versus a locked prosthetic knee joint. , 2002, Archives of physical medicine and rehabilitation.

[8]  M. B. Taylor,et al.  A comparison of energy expenditure by a high level trans-femoral amputee using the Intelligent Prosthesis and conventionally damped prosthetic limbs , 1996, Prosthetics and orthotics international.

[9]  B. Heller,et al.  A comparative evaluation of oxygen consumption and gait pattern in amputees using Intelligent Prostheses and conventionally damped knee swing-phase control , 2005, Clinical rehabilitation.

[10]  T. Schmalz,et al.  Energy expenditure and biomechanical characteristics of lower limb amputee gait: the influence of prosthetic alignment and different prosthetic components. , 2002, Gait & posture.

[11]  W. Miller,et al.  The prevalence and risk factors of falling and fear of falling among lower extremity amputees. , 2001, Archives of physical medicine and rehabilitation.

[12]  J. Czerniecki,et al.  Does having a computerized prosthetic knee influence cognitive performance during amputee walking? , 2006, Archives of physical medicine and rehabilitation.

[13]  A Gitter,et al.  A reassessment of center-of-mass dynamics as a determinate of the metabolic inefficiency of above-knee amputee ambulation. , 1995, American journal of physical medicine & rehabilitation.

[14]  W D Spence,et al.  Energy cost of walking: comparison of "intelligent prosthesis" with conventional mechanism. , 1997, Archives of physical medicine and rehabilitation.

[15]  R. H. Meier,et al.  Rehabilitation in limb deficiency. 4. Limb amputation. , 1996, Archives of physical medicine and rehabilitation.