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Year : 2018  |  Volume : 7  |  Issue : 2  |  Page : 75-79

Stride, energy expenditure, and user's satisfaction in person with postpolio residual paralysis: A comparative study between pneumatic control and drop-lock knee joint using knee-ankle-foot orthosis

Departments of and Prosthetics and Orthotics, ISIC-IRS, New Delhi, India

Correspondence Address:
Ms. Prachi Prava Pattnaik
ISIC-IRS, New Delhi - 110 070
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Source of Support: None, Conflict of Interest: None

DOI: 10.4103/ijhas.IJHAS_61_1

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BACKGROUND: Persons with postpolio residual paralysis (PPRP) present gait abnormalities due to residual lower extremity pareses and joint deformities.[1,2] An increase in energy cost results from lower extremity muscle weakness. Lower extremity orthoses are prescribed to reduce gait abnormalities, to enable standing and walking, and to maintain or improve physical performance. The present study is to determine the effectiveness of the newly designed pneumatic control knee joint [Figure 2] with respect to stride parameter, energy expenditure, and user's satisfaction in comparison to drop-lock knee joint [Figure 1] in knee-ankle-foot orthosis (KAFO) in a patient with PPRP.{Figure 1}{Figure 2} METHODS: Purposive sampling was done for the study, and thirty patients were recruited. The stride parameter, energy expenditure, and user's satisfaction were measured between drop-lock knee joint KAFO and pneumatic control knee joint KAFO. An adaptation period of 1 h was provided with pneumatic control KAFO. RESULTS: A paired t-test was conducted for estimating step length and stride length for subjects using drop-lock KAFO and Pnuematic control KAFO. Pneumatic Control KAFO showed a higher significance in both step length with (t = −5.150, P = 0.000) and Stride length (t = −5.026, P = 0.000). A paired t-test conducted for cadence shows a signifi cant difference (t = 1.066, P = 0.295) in favor of drop-lock KAFO. The speed shows a signifi cant difference (t = −4.704, P = 0.000) in favor of pneumatic control KAFO. Physiological cost index while walking with pneumatic control KAFO was signifi cantly lower than those walking with drop-lock KAFO (t = −5.575, P value = 0.000). The user's satisfaction for the subjects using the drop-lock KAFO and the pneumatic control KAFO shows a significant difference (t = −9.798, P = 0.000) in favor of pneumatic control KAFO. CONCLUSION: The study concludes the pneumatic control KAFO to have significantly greater value as compared to drop-lock KAFO in terms of stride parameter and energy expenditure and user's satisfaction in subjects with PPRP.

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