The effectiveness of low-Dye taping and calf muscle stretching for plantar heel pain

Plantar heel pain is a common disorder that can involve considerable pain. Many treatments have been suggested to manage the condition however few have been rigorously evaluated. Two treatments commonly recommended in clinical practice are adhesive taping applied to the foot and calf muscle stretching. The effectiveness of neither treatment is supported by good quality evidence. Aim: To examine the effectiveness of two short-term interventions, low-Dye taping and calf muscle stretching, for the treatment of plantar heel pain. In addition, the effect of the interventions on biomechanical variables was investigated. Design: Four studies were undertaken in the thesis. The first study in the thesis (Chapter 3) investigated the biomechanical effect of low-Dye taping on the lower limb by systematically reviewing appropriate clinical trials. Meta-analyses were undertaken where appropriate. The second study (Chapter 4) was a blinded randomised trial conducted to evaluate the effectiveness of low-Dye taping for the short-term treatment of plantar heel pain. The third study (Chapter 5) investigated the effect of calf muscle stretching on ankle joint range of motion by systematically reviewing appropriate clinical trials. Meta analyses were again undertaken where appropriate. The fourth and final study (Chapter 6) was another blinded randomised trial conducted to evaluate the effectiveness of calf muscle stretching for the short-term treatment of plantar heel pain. Setting: Both randomised trials were conducted at a university-based clinic in Sydney, Australia. Participants In the randomised trials, 184 participants who met the inclusion and exclusion criteria for plantar heel pain were recruited from the local community. In the first trial 92 participants were evaluated over a one-week period and randomly allocated to receive either low-Dye taping or a sham intervention. In the second trial 92 participants were evaluated over a two-week period and randomly allocated to receive either calf muscle stretching or a sham intervention. Outcome measures In the first systematic review, all trials that met the inclusion and exclusion criteria evaluated the effect of low-Dye taping on kinematic, kinetic and electromyographic outcomes. For the second systematic review, all trials that met the inclusion and exclusion criteria examined the effect of calf muscle stretching on the outcome of ankle joint dorsiflexion range of motion. Both randomised trials in this thesis used the Visual Analogue Scale and the Foot Health Status Questionnaire as primary outcomes. In the stretching randomised trial secondary outcomes were also assessed, namely the Foot Posture Index-6 and the Ankle Lunge Test. Results: The first systematic review found that low-Dye taping provides a small, statistically significant increase in navicular height immediately after application (weighted mean difference 5.90mm; 95% confidence interval 0.41 to 11.39; p=0.04)1 indicating a reduction in foot pronation. However, after exercise, taping had no statistically significant effect on navicular height (weighted mean difference 4.70mm; 95% confidence interval –0.61 to 10.01; p=0.08). In addition, taping had no statistically significant effect on maximum rear foot eversion (weighted mean difference –0.59°; 95% confidence interval ����2.53 to 1.35; p=0.55) or total rear foot range of motion while walking (weighted mean difference 2.3°; 95% confidence interval –0.64 to 5.24; p=0.13). The first randomised trial found that low-Dye taping had a significantly greater decrease in ‘first-step’ pain compared to a control group. The estimate of the mean difference between the groups (measured on 100mm Visual Analogue Scale) favoured the taping group (-12.3mm; 95% confidence interval -22.4 to -2.2; p=0.017). There 1 P values are provided to three decimal places except when values were generated using systematic review software, Review Manager 4.2.7, which sometimes only calculates results to two decimal places. were no differences detected in any of the other outcome measures. The taping was associated with mild to moderate short-lived adverse events that could be minimised with the use of hypoallergenic tape and careful application of the tape to reduce tightness. The second systematic review found that calf muscle stretching provides a small, statistically significant increase in ankle joint dorsiflexion. Stretching for ≤15 minutes (in a single session or accumulated over multiple sessions) provides a weighted mean difference of 2.07° (95% confidence interval 0.86 to 3.27; p(less than)0.001). 15 to 30 minutes (accumulated over multiple sessions) increased dorsiflexion by a weighted mean difference of 3.03° (95% confidence interval 0.31 to 5.75; p=0.03), and >30 minutes of stretching (accumulated over multiple sessions) increased dorsiflexion by a weighted mean difference of 2.49° (95% confidence interval 0.16 to 4.82; p=0.04) indicating no further increase in dorsiflexion is achieved by stretching for >30 minutes. The second randomised trial found that calf muscle stretching compared to a control group, had no significant effect on ‘first-step’ pain, foot pain, foot function or general foot health. Stretching was associated with mild to moderate adverse effects that were short-lived once stretching ceased. Conclusion: When used for the treatment of plantar heel pain, low-Dye taping provides a small increase in navicular height, and after one week, produces a small reduction in the ‘first-step’ pain. Calf muscle stretching increases ankle joint dorsiflexion approximately 2 to 3 degrees but has no effect on plantar heel pain after two weeks. It can therefore be concluded that low-Dye taping is effective for the short-term treatment of the ‘first-step’ pain associated with plantar heel pain, but calf muscle stretching is not effective for plantar heel pain