Hallux valgus is the most common deformity of forefoot and the patients would suffer pain and disable of walking and wearing normal shoes. Chevron osteotomy of the first metatarsal is widely used for the treatment of mild or medium hallux valgus. It is a "V" sharp osteotomy that can decrease the intermetatarsal degree of first-second metatarsal by pushing the distal side of osteotomy laterally.A 2.5mm or 3.0mm steel cannulated screw is usually used for the fixation of the osteotomy side to provide stability.However,there are some shortcomings of steel screws such as rejection of internal fixation or the financial cost of the second surgery of fixation taken-out. To obviate these shortcomings of steel screws, bioabsorbable screw fixation may be an alternative method for chevron osteotomy. This trial is a randomized, prospective, controlled, parallel experimental design, to compare the clinical and radiographic outcomes of bioabsorbable screw versus steel screw for the treatment of hallux valgus with chevron osteotomy. The patients will be randomized to two groups, one treated with bioabsorbable screws while the other treated with steel screws.Data collection for the outcomes measures will occur pre-op,immediate post-op and then 6 weeks, 12 weeks, and at 1 years post operation. The clinical outcomes measure are the VAS (visual analogue scale) score and AOFAS (American orthopedic foot and ankle society) forefoot score.The radiographic outcomes measures are the IMA (intermetatarsal angle) and the HVA (hallux valgus angle)
Study Type
INTERVENTIONAL
Allocation
RANDOMIZED
Purpose
TREATMENT
Masking
QUADRUPLE
Enrollment
50
Hallux valgus are treated with a distal chevron osteotomy of first metatarsal and fixed using the bioabsorbable screw
Hallux valgus are treated with a distal chevron osteotomy of first metatarsal and fixed using the steel screw
American orthopedic foot and ankle society forefoot score change
American orthopedic foot and ankle society forefoot score was consist of "pain","ability of walking" and "alignment".The minimum score is 0 and the maximum score is 100, "0"means worst while "100" means best of the outcome. It was used as a standard evaluation method of hallux valgus.
Time frame: pre-op,6 weeks,12 weeks and 1 year after operation
Radiographic outcomes parameters
IMA (intermetatarsal angle ),HVA (hallux valgus angle) measured in weight-bearing anteroposterior of foot
Time frame: pre-op,6 weeks,12 weeks and 1 year after operation
VAS score
Visual Analogue Scale,a widely used score about pain. It present different level of pain by using the number 0-10. 0 present no pain while 10 present worst pain
Time frame: pre-op,6 weeks,12 weeks and 1 year after operation
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