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Influence of Prior Activity on Residual Limb Volume and Shape: Results from Transtibial Limb Loss Individuals

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This study examines how prior activity affects the shape of plaster casts taken of transtibial residual limbs. The findings show that ordering of trials had a significant influence on the mean radial difference between two shapes. Practitioners should consider prior activity and doffing history when casting limbs for socket design and prosthetic fitting.

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Influence of Prior Activity on Residual Limb Volume and Shape: Results from Transtibial Limb Loss Individuals

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  1. Influence of prior activity on residual limb volume and shape measured using plaster casting: Results from individuals with transtibial limb loss Joan E. Sanders, PhD; Michael R. Severance, MSE; David L. Swartzendruber, MSE; Katheryn J. Allyn, CPO; Marcia A. Ciol, PhD

  2. Aim • Determine whether prior activity affected shape of plaster cast taken of transtibial residual limb. • Relevance • If practitioner does not carefully plan measurements to account for previous activity, changes in volume and shape might not be measured correctly, leading to false interpretation of clinical measurements.

  3. Method • 24 participants with transtibial limb loss. • Plaster casts were taken twice in 1 day. • Two trials: • PDI-5s: 5 s between doffing and casting. • PDI-20m: 20 min between doffing and casting. • Ordering of trials was randomized.

  4. Results • Mean radial difference between PDI-20m and PDI-5s: • 0.34 mm when PDI-5s conducted first. • 0.02 mm when PDI-20m conducted first. • Ordering of trials had statistically significant influence on mean radial difference between the two shapes.

  5. Conclusion • Result shows that prior activity influenced residual limb cast shape. • Practitioners should be mindful of prior activity and doffing history when casting individual’s limb for socket design and prosthetic fitting.

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