• Maxillofacial Plastic and Reconstructive Surgery
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• 제27권3호
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• pp.205-217
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• 2005

Distraction osteogenesis is a technique of lengthening bone including soft tissue by gradual separation of surgically divided bone surfaces. Although the biomechanical, histological, and ultrastructural changes associated with distraction osteogenesis have been widely described, the molecular mechanisms governing the formation of new bone in distracted bone segments remain largely unclear. However, such information has significant clinical implications because it may enable targeted therapeutic manipulations designed to accelerate osseous regeneration. The purpose of this study was to evaluate the expression of TGF-$\beta$1, IGF-I and bFGF in distraction osteogenesis according to different distraction rates in a rabbit's mandible. When twenty-four adult rabbits underwent open osteotomy between the premolar and mental foramen, an external bilateral distraction device was applied. Latency was allowed for five days before distraction. Three different distraction rates were 0.7 mm/day (A, n=8), 1.4 mm/day (B, n=8) and 2.4 mm/day (C, n=8). The distraction device was activated with the same distraction rhythms of twice a day until 4.9 mm (A & B group) and 8.4 mm (C group) length gains was achieved. The animals were sacrificed at postoperative 3, 7, 14 and 28 days. The bony specimens were stained with H&E for histologic examination, and RT-PCR analysis was done for the identification of the expression of TGF-$\beta$1, IGF-I and bFGF. The results obtained from this study were as follows : The 0.7 mm/day and 1.4 mm/day distraction rate groups were shown to improve regenerative bone formation on radiographic and histologic examination. Also, TGF-$\beta$1, IGF-I and bFGF expression increased in the 0.7 mm/day and 1.4 mm/day distraction rate groups. But the 2.4 mm/day distraction rate group specimen was different with adjacent normal bone and hardly expressed of growth factors. These findings suggest that improved new bone formation in the 0.7 mm/day and 1.4 mm/day distraction rates is associated with enhanced expression of TGF-$\beta$1, IGF-I and bFGF by mechanical tension stress. Additionally, the 0.7 mm/day and 1.4 mm/day distraction rate groups were significantly different from the 2.4 mm/day distraction rate group in the expression of growth factors. According to the above results, it seems possible to apply a distraction rate of up to 1.4 mm/day a day in rabbit's mandible. And further studies are needed to evaluate growth factors of TGF-$\beta$1 and IGF-I, which are excellent in expression.

• 대한정형외과학회지
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• 제54권6호
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• pp.547-556
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• 2019

목적: 도수조작 및 석고 교정을 통해 보존적 치료를 시행하였으나 잔여 혹은 재발변형으로 수술적 치료를 받았던 특발성 만곡족 환아의 장기 치료 결과를 분석하였다. 대상 및 방법: 방사선상 골 성숙이 완료된 32명의 환자 총 51예를 대상으로 후향적인 연구를 시행하였다. 최종 추시 시 평균 연령은 18.7세였다. 수술은 선택적 혹은 광범위 연부조직 유리술과 힘줄 연장, 힘줄 이전, 다양한 절골술 등을 시행하였다. 방사선적 분석은 최종 촬영한 체중부하 전후면 사진에서 거종골 각(talocalcaneal angle), 거골-제1 중족골 각(talo-first metatarsal angle), 측면 사진에서 측정한 거종골 각, 종골 경사각(calcaneal pitch)을 측정하여 성인정상 측정값과 비교하였다. 임상적 평가는 American Orthopaedic Foot and Ankle Society (AOFAS)의 ankle-hindfoot score와 midfoot score를 이용하여 우수(>85), 양호(71-85), 보통(56-70), 불량(<56)으로 평가하였다. 결과: 최종 방사선 계측치는 전후면 거종골 각에서 각각 41.2%, 전후면 거골과 제1 중족골 간의 각에서 90.2%, 측면 거종골 각에서 84.3%, 측면 종골 경사각에서 각각 61%가 정상범위에 포함되었다. AOFAS 평균은 ankle-hindfoot score에서 88.1±10.7점 midfoot score에서 86.7±11.5점이었다. 결론: 수술적 치료를 받았던 특발성 만곡족 환아의 장기 치료 결과에서 정상범위에 속하는 방사선 지표 비율은 43%-90%로 확인되었으며 임상적으로 AOFAS 평균값은 우수에 속하였다. 따라서 비수술적 교정 방법에 실패한 경우라도 변형의 요소를 보다 더 정확히 분석한 후 선택적 수술 방법을 통할 경우 임상적으로 만족스러운 결과를 가져올 수 있다.