a first embodiment of a dynamic tension device is illustrated in fig1 - 5 and 7 ( medial view of device over the bones of the foot ). the device utilizes a hallux sling 1 ( fig2 ), which is a stiff elastic band consisting of a nylon blend , although it is not limited to this material , wrapped around the plantar surface of the hallux 4 ( fig2 ). the second toe may also be included in the hallux sling 1 ( fig2 ). the hallux sling 1 ( fig2 ) is secured to the posterior ankle 5 ( fig2 ) via the ankle sling 2 ( fig2 ). the ankle sling 2 ( fig2 ) is another stiff elastic band , which is composed of the same material as the hallux sling 1 ( fig2 ), although it may be composed of a different material . the ankle sling 2 ( fig2 ) is less stiff than the hallux sling 1 ( fig2 ) and is wrapped around the ankle 5 ( fig2 ). a second embodiment of the invention includes the first embodiment of the invention , in addition to a sock as shown in fig6 . alternatively , the remainder of the dynamic tension device is filled in with a flexible material 3 ( see e . g ., fig2 ), such as a cotton - blend , to mimic a sock , although it may be composed of another flexible material , or the remainder can be left empty based on the desired design and function . the operation of the device is illustrated in the following fig1 , 4 , 5 , 6 and 7 . the device is simple in design . it is composed of a hallux ( big toe ) sling 1 made of an elastic band and cotton or other similar materials which is secured to itself by a velcro ® hoop and loop fastener - or other similar material . the hallux sling 1 is in the form of a helix . a hallux sling 1 of the first embodiment of the invention , without a sock , is shown over a foot in fig1 . a close view of the hallux loop ( helix ) of the device is shown in fig7 . as shown the helix can include a second piece of elastic or other comparable material to increase comfort for the patient . the loop is composed of an elastic band sewn to a cloth band . these combined bands form a loop or “ helix ” and turn back in to be secured by a velcro ® hoop and loop fastening device . this device utilizes a hallux sling 1 ( fig2 ), composed of an elastic band , wrapped around the plantar surface of the hallux 4 ( fig2 ) but not including the metatarsophalangeal joint 8 ( fig2 ) between the first metatarsal 7 and the hallux 4 to provide the force of dorsiflexion required to overcome the resting strength of the flexor hallicus longus and result in passive hallux dorsiflexion . the second toe may be included in the hallux sling 1 ( fig2 ) to increase the effect of the device as the windlass effect is mediated primarily by the first and second toes , but it is not required . additionally , the hallux sling 1 ( fig2 ) remains articulated at the metatarsophalangeal joint 8 ( fig2 ), free from the remaining toes not incorporated into the hallux sling 1 ( fig2 ), to allow for independent dorsiflexion of the hallux 4 ( fig2 ), locking of the longitudinal arch , and tension to the plantar fascia . dorsiflexion of the hallux 4 ( fig2 ) activates the windlass effect by tensing the plantar fascia and locking the longitudinal arch of the foot . the hallux sling 1 ( fig2 ) is secured to the posterior ankle 5 ( fig2 ) via the ankle sling 2 ( fig2 ). the ankle sling 2 ( fig2 ) is another stiff elastic band , which is less stiff than the hallux sling 1 ( fig2 ), and it is wrapped around the ankle joint 5 ( fig2 ) to provide the force of dorsiflexion required to overcome some of the resting strength of the gastrocnemius - soleus complex and result in passive ankle dorsiflexion . it is this portion that will act like any traditional static ankle splint by maintaining the ankle 5 ( fig2 ) in a dorsiflexed position . the ankle sling 2 ( fig2 ) may be in continuity or adjustable to accommodate increased tension as well as large foot sizes . if adjustable , one or both sides of the sling can be pulled and wrapped behind the posterior ankle 5 ( fig2 ) until appropriate fit and / or tension is achieved , and the sling can be fixed into position by securing the sides of the ankle sling 2 ( fig2 ) with an attachment device 6 ( fig2 ), including , but not limited to , tape , velcro ® hoop and loop fastener , a zipper , or a snap . because the hallux sling 1 ( fig2 ) is attached to the ankle sling 2 ( fig2 ) providing tension from the dorsal side of the hallux 4 ( fig2 ), dorsiflexion changes with tibiotalar motion . hence , the more tibiotalar plantarflexion results in more hallux 4 ( fig2 ) dorsiflexion and vice versa . it is possible , but not required , that the hallux sling 1 ( fig2 ) and ankle sling 2 ( fig2 ) be made of the same material with a static elasticity or an elastic gradient as long as tension is applied in the dorsal direction at the hallux 4 ( fig2 ) and ankle 5 ( fig2 ). this allows the foot to come to a new equilibrium position at rest with the plantar fascia tensed and the longitudinal arch locked . the plantar fascia is tensed and longitudinal arch is locked independent of the position of the tibiotalar joint . however , the force applied to the plantar fascia can change with tibiotalar motion , alleviating the burning pain associated with a static stretch applied to the plantar fascia . the remainder of the device can be filled in with a flexible material 3 ( fig2 ) to mimic a sock or left empty to mimic a splint depending on the desired design and function . the flexible material 3 or sock can be sewn into the hallux sling 1 and ankle sling 2 , or a sock may fit , as shown in fig6 , underneath the hallux sling 1 and ankle sling 2 . being the most flexible and located on the plantar aspect of the hallux 1 ( fig2 ) proximal to the first metatarsophalangeal joint 8 ( fig2 ), this remaining material will not affect the function of the device as long as it remains more flexible than the hallux sling 1 ( fig2 ) or ankle sling 2 ( fig2 ). the device is designed to be simple and easily manufactured . the device retracts the big toe of the foot through use of a strap .
a physical rehabilitation device for the treatment of a medical condition of the foot known as plantar fasciitis includes a splint which is connected to the toe and ankle of a patient . the splint can be used in a method for treating plantar fasciitis known as “ dynamic splinting ”. this device allows the patient to bend the ankle and thus dynamically change the flexion in the foot of the patient . the device itself is unique , but the method of treatment made possible by this device is also unique .