First, the concept of brace is used in the process of weight-bearing walking, changing the strength and type of force on the lateral aspect of the foot, reducing the abnormal load on the distal end of the foot and lower limb, so that the foot and lower limb to play a normal role in the shoe and / or outside the medical apparatus. Second, the role of supporting aids 1, accommodation, adaptation and support deformity 2, correction or prevention of deformity 3, control or restriction of joint activities 4, reduce or eliminate the load on the limbs and joints 5, to relieve the area of excessive pressure on the bottom of the foot 3, types 1, prefabricated foot support heel pad arch pad full foot pad metatarsal pad smooth toe pad 2, custom foot support 4, materials 1, soft materials for diabetic foot, rheumatoid foot and high arch foot, etc. 2.Neutral material 2.Neutral material is used for sports injury. 3.Hard materials are used for reversible flatfoot, chronic ankle instability, etc. V. Role of orthopedic shoes 1 Thomas bar reduces the pressure on the metatarsal head 2, Schuster heel wedge elevates the heel 3, various decompression pads prevent pressure on the bony prominence 4 medial heel block prevents inversion 5, wedge heel 6, central sole reinforcement 7, rocker bottom 8, high advancement for patients with rigid forefoot exostosis and persistent intermetatarsal neuroma, low advancement for patients with combined over-rotation front bunion A. Although it cannot change the total degree of rotation of the foot, it can increase the moment of the lower joint when following the ground. B. It obviously increases the range and speed of the early rotation of the lower joint. B. The front end of the shoe is cocked to shorten the functional length of the shoe and reduce the activity of the metatarsophalangeal joint when advancing. Clinical application of foot and ankle support aids (a) 1st metatarsophalangeal joint lesion 1. Atrophy, instability of the metatarsophalangeal joint, intermetatarsal neuroma. 2, the role of the support to limit joint activity, reduce joint stress and metatarsal load (c) heel pain 1, types of metatarsal tendonitis, fat pad inflammation, heel periostitis. 2, the role of the support to elevate the heel, reduce stress, elevate the arch, stabilize the foot, reduce the metatarsal tendon membrane pull (d) high arch foot 1, performance: forefoot inversion, inversion, medial sequence of plantarflexion, increased arch, heel inversion. 2, the role of the support soft Material absorbs stress Corrects heel inversion (d) Lateral ankle instability Role of brace Reduces joint activity Stabilizes joint Maintains joint position Increases plantar static balance Reduces external muscle control (e) Flatfoot syndrome Role of brace Phase 1 Customized rigid or neutral foot brace, such as UCBL. stabilizes arch, reduces posterior tibial tendon load Phase 2 Customized hinged ankle foot support (AFO). Corrects hindfoot deformity and preserves ankle motion. Stages 3 and 4 Rigid ankle-foot support (AFO). aruzona support. Reduces ankle and hindfoot motion, reduces Achilles tendon pulling force. (vi) Foot and ankle osteoarthritis 1, ankle Customized AFO 2, hindfoot UCBL, Aricast ankle brace, Aruzona brace. 3.Midfoot Hard-soled shoe with rocking chair sole 4.Forefoot Hard-soled shoe (vii) Bunion 1.Smooth toe pad 2.Night splint 3.Drawing band (viii) Postoperative shoe