Influence of walking with talus taping on the ankle dorsiflexion passive range of motion.

[Purpose] This study investigated the effects of walking with talus taping on the ankle dorsiflexion passive range of motion (DF PROM) in individuals with limited ankle DF PROM. [Subjects] Fifteen ankles with limited DF PROM were examined. [Methods] After rigid strapping tape was applied to the ankles from the talus to the calcaneus, progressing posteriorly and inferiorly, the subjects walked on a walkway for 10 min. Using a goniometer, the ankle DF PROM was measured with the knee extended before and after walking with talus taping. The difference in ankle DF PROM between before and after walking with talus taping was analyzed using the paired t-test.
[Results] The ankle DF PROM was significantly increased after walking with talus taping.
[Conclusion] Our findings indicate that walking with talus taping is effective for increasing the ankle DF PROM in individuals with limited ankle DF PROM.

INTRODUCTION

Walking from one place to another is a basic functional activity in daily living1, 2). However, repeated abnormal walking patterns can induce foot and ankle injuries3, 7). Abnormal kinematics of the ankle during walking may increase the risk for chronic ankle instability and ankle sprain3, 4).

Limited ankle dorsiflexion passive range of motion (DF PROM) with the knee extended can cause altered foot positions and compensatory foot movements leading to an abnormal walking pattern, which can result in ankle sprain and lower extremity overuse injuries5, 6). Willems et al.5) suggested that limited ankle DF PROM tends to place the foot in the plantar flexion position, which contributes to ankle sprain related to ankle plantar flexion and inversion during sports activities. In addition, limited ankle DF PROM may increase stress in the tissues associated with lower extremity overuse injuries due to subtalar joint pronation and early heel off in compensatory foot motion during gait movement7). In view of the importance of ankle DF PROM, clinicians are motivated to find an intervention to increase ankle DF PROM5, 8, 9).

The mobilization with movement (MWM) technique is an effective intervention for increasing the posterior glide of the talus and ankle DF PROM10, 11). MWM for the ankle joint involves sustained anterior-to-posterior glide of the talus through passive manual force while the patient performs active ankle DF12). For normal ankle DF PROM, sufficient posterior glide of the talus and adequate gastrocnemius and soleus muscle length are necessary2, 13). Anterior-to-posterior ankle joint mobilization improves arthrokinematic motion of the talus by increasing flexibility of the noncontractile tissues around the ankle joint14, 15). Vicenzino et al.11) showed that MWM for the ankle joint increased not only posterior glide of the talus but also ankle DF PROM in individuals with recurrent ankle sprain.

To acquire adequate motion of the talus, the application of tape to the talus is suggested13). Sahrmann13) stated that application of tape to the talus posteriorly and inferiorly stabilizes the talus during tibial advancement movements. The stabilizing force from the tape may allow further tibial advancement over the foot as well as posterior glide of the talus. Considering that posterior glide of the talus is essential for sufficient ankle DF PROM2), improved glide of the talus during walking with talus taping may lead to an increase in ankle DF PROM.

Even though limited ankle DF PROM induces abnormal walking patterns associated with ankle and lower extremity overuse injuries6, 7), traditional interventions for increasing ankle DF PROM have not addressed the abnormal arthrokinematic motion of the talus during walking10, 11, 14). To more efficiently increase ankle DF PROM, novel interventions combined with functional activity such as walking are required. Walking with talus taping is a suggested intervention for improving posterior glide of the talus and ankle DF PROM; however, no published reports have investigated the effects of walking with talus taping on ankle DF PROM. Based on previous results and clinical experience, we hypothesized that walking with talus taping would significantly increase ankle DF PROM, and this study was conducted to test this hypothesis.

SUBJECTS AND METHODS

Nine subjects with a mean age of 25.89 ± 2.96 years, mean weight of 65.69 ± 13.85 kg, and mean height of 169.61 ± 8.65 cm were recruited, and 15 ankles with limited ankle DF PROM (mean ankle DF PROM, 7.33 ± 1.88°) were tested for this study. Subjects who had less than 10° ankle DF PROM with the knee extended, unilaterally or bilaterally, and in whom the ankle DF PROM was greater with the knee flexed than with the knee extended were included in this study. Exclusion criteria included a history of surgery in a lower extremity, neurological diseases, and a lower extremity injury during the previous 6 months. Before participating, all subjects signed an informed consent form approved by the Inje University Faculty of Health Science Human Ethics Committee.

To measure the ankle DF PROM with the knee extended, subjects were placed in the prone position on a table with the knee extended and the tested ankle positioned over the edge of the table. An examiner applied force to the plantar surface of the foot until a firm resistance was encountered. The subtalar joint was maintained in a neutral position during the ankle DF PROM measurement. Another examiner confirmed the neutral subtalar position, and then measured the ankle DF ROM using a 14-inch stainless steel goniometer. The center of the fulcrum of the goniometer was placed over the lateral malleolus, the proximal arm of the goniometer was placed over the line from the fibular head to the lateral malleolus, and the distal arm was aligned parallel to the fifth metatarsal. With the knee extended in the prone position, the ankle DF PROM was measured three times before and after walking with talus taping, respectively, and the mean values of the three trials were used for data analysis.

After the ankle DF PROM was measured, the talus was taped. The tested ankle was placed on a chair, and the subject performed ankle DF in the weight-bearing position. Rigid tape (battlewin tape; Nichiban Co., Ltd., Tokyo, Japan) was applied from the talus to the calcaneus, passing below the medial and lateral malleoli. The subjects then walked around a walkway for 10 min with talus taping. After 10 min, the rigid tape was removed, and the same examiner measured the ankle DF PROM of the subjects with the knee extended.

A paired t-test was used to assess the significance of the difference in ankle DF PROM between before and after walking with talus taping. Statistical analyses were performed with SPSS 17.0 for Windows (SPSS, Inc., Chicago, IL, USA), and an alpha level of 0.05 was considered statistically significant.

RESULTS

The measured ankle DF PROM was significantly greater after walking with talus taping than before walking with talus taping (Table 1).

Table 1.

Ankle dorsiflexion passive range of motion before and after walking with talus taping

Variable	Mean ± SD (°)
	Before walkingwith talus taping	After walkingwith talus taping
Ankle DF PROM (°)	7.33 ± 1.88	11.44 ± 2.41*

DF PROM, dorsiflexion passive range of motion. *p<0.05

DISCUSSION

This study demonstrated that walking with talus taping significantly increased the ankle DF PROM in individuals with limited ankle DF PROM.

A previous study found that posterior glide of the talus is an important factor for increasing ankle DF PROM14). Green et al.14) reported that individuals with ankle sprain acquired full pain-free ankle DF PROM after anterior-to-posterior ankle joint mobilization for 2 weeks. Posterior glide of the talus can also be accomplished by mobilization with movement10, 11). The MWM technique uses manual force to produce sustained anterior-to-posterior glide of the talus during ankle DF, thereby improving the gliding motion of the talus and the ankle DF PROM. Walking with talus taping may produce a similar effect on the ankle joint because during the stance phase of the gait, tibial advancement over the foot acts as the ankle DF, and the posteriorly and inferiorly applied tape may aid posterior glide of the talus. During walking with talus taping, the posterior and inferior force applied to the talus by the tape may substitute for manual posterior glide of the talus in the MWM technique. Therefore, we infer that talus taping assists posterior glide of the talus during the stance phase of the gait and thus may increase ankle DF PROM. In addition, walking with talus taping was performed under weight-bearing conditions during the stance phase of the gait. Mulligan16) stated that posterior glide of the talus is more effective with weight-bearing than under non-weight-bearing conditions because weight-bearing conditions reflect aspects of functional activities. In the current study, tibial advancement over the foot in the stance phase of the gait during walking with talus taping involved a weight-bearing condition, which may have contributed to the increased ankle DF PROM.

Previous interventions for increasing ankle DF PROM have overlooked the importance of correcting the abnormal walking pattern associated with limited ankle DF PROM10, 11, 14, 15). Considering that walking is a basic requirement for many activities1, 2), a combination of intervention for limited ankle DF PROM and walking activity is needed to improve the efficiency of the intervention. In contrast to joint mobilization or the MWM technique, walking with talus taping may correct abnormal arthrokinematic motion of the talus during walking, which increased the ankle DF PROM in our study. Furthermore, walking with talus taping has the benefits of time conservation and efficiency because it can be performed without a therapist's assistance. Thus, walking with talus taping is suggested as an efficient novel intervention for increasing ankle DF PROM in individuals with limited ankle DF PROM.

This study has some limitations. First, we did not measure the improvement in posterior glide of the talus after walking with talus taping. In view of the importance of posterior glide of the talus to ankle DF PROM, future studies should investigate the effects of walking with talus taping on posterior glide of the talus. Second, we did not measure how the increased ankle DF PROM after walking with talus taping influenced ankle motion during functional activities. The influence of talus taping on ankle kinematics during walking, running, and squatting should be demonstrated in future studies. Lastly, it is difficult to generalize our results to other populations because of the small sample size in the present study.