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O32 A randomised controlled trial investigating the effects of a 4-week ankle rehabilitation program on hopping tasks in high school athletes with chronic ankle instability
  1. MS Cain1,
  2. BM Goerger2,
  3. SW Linens3
  1. 1Kinesiology, Georgia State University, USA
  2. 2Sports Medicine, Georgia State University, USA
  3. 3Human Physiology, University of Oregon, USA


Study Design Randomised Controlled Trial.

Objectives To determine effects of three ankle rehabilitation programs on hopping ability of high-school athletes with Chronic Ankle Instability (CAI).

Background CAI interventions have been evaluated; however, a specific program that is most effective has not been determined.

Methods and Measures Thirty-six patients with ‘giving way’ and history of ankle sprains (i.e. CAI) were randomised into four rehabilitation groups: Resistance band (RB) (n=12, 171.24±10.13 cm, 65.75±11.16 kg, 16.42±0.99 years), Biomechanical Ankle Platform System (BAPS) (n=9, 178.22±10.36 cm, 77.52±22.84 kg, 16.133±1.00 years), Combination (BAPS/RB) (n=7, 172.00±12.16 cm, 68.61±17.94 kg, 16.57±1.13 years), and Control (CON) (n=8, 171.45±11.52 cm, 71.78±25.66 kg, 16.75±0.89 years). Two tests were used to assess hopping abilities: figure-of-8-test (FET) and side-hop-test (SHT). FET required patients to hop 5-metre distance in a figure-of-8 pattern two times. SHT required patients to hop 30 centimetres medially/laterally 10 times. Hopping ability was measured in time to complete (sec). Shorter time indicated improvement. Rehabilitation programs were completed 3/week for four weeks. RB completed 3 sets of 10 repetitions of ankle dorsiflexion/plantarflexion/inversion/eversion. BAPS completed 5 sets of 40 s trials of clockwise/counterclockwise rotations, changing direction every 10 s. BAPS/RB completed both programs and CON completed no exercises. After 4 weeks, baseline measurements were repeated. Two 4 × 2 mixed-model ANOVAs were used for data analysis (α=0.05). Tukey’s HSD post-hoc tests were conducted on significant interactions.

Results Main effects for time were significant for FET (p<0.00001) and SHT (p<0.003). Main effects for group were not significant for FET (p=0.608) or SHT (p=0.229). Significant group by time interaction was found for FET (F1,32=4.08, p=0.015) but not SHT (F1,32=2.10, p=0.119). FET post-hoc testing showed BAPS/RB (p<0.003) improved pretest to posttest whereas CON, RB and BAPS did not.

Conclusion All rehabilitation programs showed improvement from pretest to posttest with BAPS/RB showing more improvement. Each can be used to improve hopping abilities in individuals suffering from CAI.

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