A comparative evaluation of oxygen consumption and gait pattern in amputees using Intelligent Prostheses and conventionally damped knee swing-phase control

Datta, D.; Heller, Ben; Howitt, John

doi:10.1191/0269215505cr805oa

Cited by 69 publications

(78 citation statements)

References 10 publications

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“…Although IP users still demonstrated increased energy expenditure compared with the nondisabled subjects, the 24 percent increase was less than previously documented for TF amputees. Datta et al recently compared conventional and microprocessor-controlled knees in amputees at several walking speeds and found significantly reduced oxygen costs at slower walking speeds; however, they did not calculate net oxygen costs and none of the subjects reached steady state at any of the speeds [9]. Subtraction of the subjects' oxygen cost at rest from the oxygen cost at slower walking speeds might have eliminated the statistically significant difference at slower walking speeds observed by Datta et al [9].…”

Section: Introductionmentioning

confidence: 93%

Gait efficiency using the C-Leg

Orendurff¹,

Segal²,

Klute³

et al. 2006

JRRD

108

112

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Abstract-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.

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Section: Introductionmentioning

confidence: 93%

Gait efficiency using the C-Leg

Orendurff¹,

Segal²,

Klute³

et al. 2006

JRRD

108

112

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“…Several studies have compared various outcomes associated with use of MKMs versus nonmicroprocessor knee mechanisms (NMKMs) [8][9][10][11][12][13][14][15]. In a within-subject study of 12 TF amputees, Schmalz et al reported a 6 percent reduction in oxygen consumption rate (milliliter/ kilogram/minute) at slower walking speeds for the C-Leg versus an NMKM [8].…”

Section: Walking Testsmentioning

confidence: 99%

Comparison of nonmicroprocessor knee mechanism versus C-Leg on Prosthesis Evaluation Questionnaire, stumbles, falls, walking tests, stair descent, and knee preference

Kahle

Highsmith²,

Hubbard³

2008

JRRD

185

283

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Abstract-This study compared subjects' performance with a nonmicroprocessor knee mechanism (NMKM) versus a C-Leg on nine clinically repeatable evaluative measures. We recorded data on subjects' performance while they used an accommodated NMKM and, following a 90-day accommodation period, the C-Leg in a convenience sample of 19 transfemoral (TF) amputees (mean age 51 +/-19) from an outpatient prosthetic clinic. We found that use of the C-Leg improved function in all outcomes: (1) Prosthesis Evaluation Questionnaire scores increased 20% (p = 0.007), (2) stumbles decreased 59% (p = 0.006), (3) falls decreased 64% (p = 0.03), (4) 75 m selfselected walking speed on even terrain improved 15% (p = 0.03), (5) 75 m fastest possible walking speed (FPWS) on even terrain improved 12% (p = 0.005), (6) 38 m FPWS on uneven terrain improved 21% (p < 0.001), (7) 6 m FPWS on even terrain improved 17% (p = 0.001), (8) Montreal Rehabilitation Performance Profile Performance Composite Scores for stair descent increased for 12 subjects, and (9) the C-Leg was preferred over the NMKM by 14 subjects. Four limited community ambulators (Medicare Functional Classification Level [MFCL] K2) increased their ambulatory functional level to unlimited community ambulation (MFCL K3). Objective evaluative clinical measures are vital for justifying the medical necessity of knee mechanisms for TF amputees. Use of the C-Leg improves performance and quality of life and can increase MFCL and community ambulation level.

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“…Therefore, it can be stated that microcontrolled intelligent prostheses improve damping performance as a function of the stride velocity transition, with a reduction in oxygen consumption during walking, over a wide range of velocities (Datta et al, 2005;Johansson et al, 2005;Kahle et al, 2008;Schmalz et al, 2002;Taylor et al, 1996).…”

Section: Introductionmentioning

confidence: 99%

Conception, design and development of a low-cost intelligent prosthesis for one-sided transfemoral amputees

2015

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Introduction: Modern transfemoral knee prostheses are designed to offer comfort and self-confidence to amputees. These prostheses are mainly based upon either a passive concept, with a damping system, or an active computational intelligent design to control knee motion during the swing phase. In Brazil, most lower extremity amputees are unable to afford modern prostheses due to their high cost. In this work, we present the conception, design and development of a low-cost intelligent prosthesis for one-sided transfemoral amputees. Methods: The concept of the prosthesis is based on a control system with sensors for loads, which are installed on the amputee's preserved leg and used as a mirror for the movement of the prosthesis. Mechanical strength analysis, using the Finite Element Method, electromechanical tests for the sensors and actuators and verification of data acquisition, signal conditioning and data transferring to the knee prosthesis were performed. Results:The laboratory tests performed showed the feasibility of the proposed design. The electromechanical concept that was used enabled a controlled activation of the knee prosthesis by the two load cells located on the shoe sole of the preserved leg. Conclusions: The electromechanical design concept and the resulting knee prosthesis show promising results concerning prosthesis activation during walking tests, thereby showing the feasibility of a reduced manufacturing cost compared to the modern prostheses available on the market.

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A comparative evaluation of oxygen consumption and gait pattern in amputees using Intelligent Prostheses and conventionally damped knee swing-phase control

Abstract: At lower speeds oxygen cost was lower with the Intelligent Prosthesis. Gait analysis detected no significant changes between the two legs.

Cited by 69 publications

References 10 publications

Gait efficiency using the C-Leg

Gait efficiency using the C-Leg

Comparison of nonmicroprocessor knee mechanism versus C-Leg on Prosthesis Evaluation Questionnaire, stumbles, falls, walking tests, stair descent, and knee preference

Conception, design and development of a low-cost intelligent prosthesis for one-sided transfemoral amputees

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