AIM To review and study the effect of lengthening along the anatomical axis of long bones and its relation to the mechanical axis deviation.METHODS We try in this review to calculate and discuss the exact clinical imp...AIM To review and study the effect of lengthening along the anatomical axis of long bones and its relation to the mechanical axis deviation.METHODS We try in this review to calculate and discuss the exact clinical impact of lengthening along the anatomical axis of the femur on affecting the limb alignment. Also we used a trigonometric formula to predict the change of the femoral distal anatomical mechanical angle(AMA) after lengthening along the anatomical axis. RESULTS Lengthening along the anatomical axis of the femur by 10% of its original length results in reduction in the distal femoral AMA by 0.57 degrees. There is no objective experimental scientific data to prove that the Mechanical axis is passing via the center of the hip to the center of the knee. There is wide variation in normal anatomical axis for different populations. In deformity correction, surgeons try to reproduce the normal usual bone shape to regain normal function, which is mainly anatomical axis. CONCLUSION Lengthening of the femur along its anatomical axis results in mild reduction of the distal femoral AMA. This may partially compensate for the expected mechanical axis lateralisation and hence justify its minimal clinical impact.展开更多
[目的]为低于身高均值2个标准差以下的成人矮身材、侏儒症、有增高愿望的志愿者实施双下肢延长术,满足患者对合理身高的追求,以增加他们的自信和融入社会(求职、婚姻等)的机遇.[方法]根据Ilizarov提出的牵拉成骨技术(distraction osteog...[目的]为低于身高均值2个标准差以下的成人矮身材、侏儒症、有增高愿望的志愿者实施双下肢延长术,满足患者对合理身高的追求,以增加他们的自信和融入社会(求职、婚姻等)的机遇.[方法]根据Ilizarov提出的牵拉成骨技术(distraction osteogenesis,DO),应用自行研制的带锁髓内钉与外固定延长器系统[1](locking intramedullary nail with external fixator for limbs lengthening,IEFL),为638例矮身材和侏儒症实施双下肢延长术.术后第8d始,以0.5～1.0 mm/d的速度延长,达到所需增加高长度后,插入髓内钉远端锁钉,拆除延长器.在延长期和骨功能重建期内,增加应力刺激,进行规范有益的功能训练,促进骨和肢体功能恢复.[结果]本组病例随访时间2.5～8a,平均4 a,增加身高8～26 cm,平均9.6 cm.根据客观、功能、主观、症状4个指标评分评定,优99.53%,良0.31%,差0.16%.发生并发症48例(56个肢体),占7.52%,其中轻度5.96%,中度1.09%,重度0.47%,至今尚未发现后遗症.[结论]IEFL技术是在Ilizarov生物学理论、技术和器械基础上的重大创新与完善,是进行大幅度(＞10%)肢体延长(增高)的一种安全、有效方法,对伴有膝内翻者还能同期矫正畸形.展开更多
文摘AIM To review and study the effect of lengthening along the anatomical axis of long bones and its relation to the mechanical axis deviation.METHODS We try in this review to calculate and discuss the exact clinical impact of lengthening along the anatomical axis of the femur on affecting the limb alignment. Also we used a trigonometric formula to predict the change of the femoral distal anatomical mechanical angle(AMA) after lengthening along the anatomical axis. RESULTS Lengthening along the anatomical axis of the femur by 10% of its original length results in reduction in the distal femoral AMA by 0.57 degrees. There is no objective experimental scientific data to prove that the Mechanical axis is passing via the center of the hip to the center of the knee. There is wide variation in normal anatomical axis for different populations. In deformity correction, surgeons try to reproduce the normal usual bone shape to regain normal function, which is mainly anatomical axis. CONCLUSION Lengthening of the femur along its anatomical axis results in mild reduction of the distal femoral AMA. This may partially compensate for the expected mechanical axis lateralisation and hence justify its minimal clinical impact.
文摘[目的]为低于身高均值2个标准差以下的成人矮身材、侏儒症、有增高愿望的志愿者实施双下肢延长术,满足患者对合理身高的追求,以增加他们的自信和融入社会(求职、婚姻等)的机遇.[方法]根据Ilizarov提出的牵拉成骨技术(distraction osteogenesis,DO),应用自行研制的带锁髓内钉与外固定延长器系统[1](locking intramedullary nail with external fixator for limbs lengthening,IEFL),为638例矮身材和侏儒症实施双下肢延长术.术后第8d始,以0.5～1.0 mm/d的速度延长,达到所需增加高长度后,插入髓内钉远端锁钉,拆除延长器.在延长期和骨功能重建期内,增加应力刺激,进行规范有益的功能训练,促进骨和肢体功能恢复.[结果]本组病例随访时间2.5～8a,平均4 a,增加身高8～26 cm,平均9.6 cm.根据客观、功能、主观、症状4个指标评分评定,优99.53%,良0.31%,差0.16%.发生并发症48例(56个肢体),占7.52%,其中轻度5.96%,中度1.09%,重度0.47%,至今尚未发现后遗症.[结论]IEFL技术是在Ilizarov生物学理论、技术和器械基础上的重大创新与完善,是进行大幅度(＞10%)肢体延长(增高)的一种安全、有效方法,对伴有膝内翻者还能同期矫正畸形.
