Gait analysis after shoe lifts in adults with unilateral developmental dysplasia of the hip

Li Tung Chang, Fong-chin Su, Kuo-An Lai, Kuen Horng Tsai

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

Shoe lifts are able to correct the leg-length discrepancies (LLDs) and relieve limp gaits of patients with unilateral developmental dysplasia of the hip (DDH). Four unilateral DDH patients were treated for leg-length equalization using shoe lifts. We evaluated gait parameters and the performance of the shoe lifts. The results showed that shoe lifts not only improved pelvic levelness, but also reduced supinatory forces within the shorter limb and pronatory forces within the longer limb. However, shoe lifts added vertical ground-reaction force (GRF) on the affected side which may cause increases of joint stress of the lower limbs. To diminish the reaction force, the heels and outsoles should be made of materials with proper shock-absorbing capabilities and as little mass as possible. Moreover, the forefoot rocker in the shoe lifts provided easier and smoother motion during the process of propelling the body forward, however, the rocker also reduced the support force for the contraction of the gastrocnemius and soleus muscles, and thus diminished the propelled force.

Original languageEnglish
Pages (from-to)137-141
Number of pages5
JournalJournal of Medical and Biological Engineering
Volume25
Issue number3
Publication statusPublished - 2005 Sep

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Gait analysis
Muscle

All Science Journal Classification (ASJC) codes

  • Biomedical Engineering

Cite this

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abstract = "Shoe lifts are able to correct the leg-length discrepancies (LLDs) and relieve limp gaits of patients with unilateral developmental dysplasia of the hip (DDH). Four unilateral DDH patients were treated for leg-length equalization using shoe lifts. We evaluated gait parameters and the performance of the shoe lifts. The results showed that shoe lifts not only improved pelvic levelness, but also reduced supinatory forces within the shorter limb and pronatory forces within the longer limb. However, shoe lifts added vertical ground-reaction force (GRF) on the affected side which may cause increases of joint stress of the lower limbs. To diminish the reaction force, the heels and outsoles should be made of materials with proper shock-absorbing capabilities and as little mass as possible. Moreover, the forefoot rocker in the shoe lifts provided easier and smoother motion during the process of propelling the body forward, however, the rocker also reduced the support force for the contraction of the gastrocnemius and soleus muscles, and thus diminished the propelled force.",
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Gait analysis after shoe lifts in adults with unilateral developmental dysplasia of the hip. / Chang, Li Tung; Su, Fong-chin; Lai, Kuo-An; Tsai, Kuen Horng.

In: Journal of Medical and Biological Engineering, Vol. 25, No. 3, 09.2005, p. 137-141.

Research output: Contribution to journalArticle

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AU - Chang, Li Tung

AU - Su, Fong-chin

AU - Lai, Kuo-An

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AB - Shoe lifts are able to correct the leg-length discrepancies (LLDs) and relieve limp gaits of patients with unilateral developmental dysplasia of the hip (DDH). Four unilateral DDH patients were treated for leg-length equalization using shoe lifts. We evaluated gait parameters and the performance of the shoe lifts. The results showed that shoe lifts not only improved pelvic levelness, but also reduced supinatory forces within the shorter limb and pronatory forces within the longer limb. However, shoe lifts added vertical ground-reaction force (GRF) on the affected side which may cause increases of joint stress of the lower limbs. To diminish the reaction force, the heels and outsoles should be made of materials with proper shock-absorbing capabilities and as little mass as possible. Moreover, the forefoot rocker in the shoe lifts provided easier and smoother motion during the process of propelling the body forward, however, the rocker also reduced the support force for the contraction of the gastrocnemius and soleus muscles, and thus diminished the propelled force.

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