We aimed to retrospectively investigate and compare patients who underwent bilateral simultaneous and consecutive lengthening surgery of the femur and tibia in terms of the effect on physeal growth. We hypothesize that compared with the sequential lengthening technique, simultaneous lengthening of the bilateral femur and tibia affects physeal growth to a greater extent. Twenty-six patients with achondroplasia who operated in our clinic between 1995 and 2015 for limb lengthening were included in the study. Fourteen patients with bilateral lengthening of the femur and tibia at the same time were named as simultaneous bilateral lengthening (SBL). Twelve patients with bilateral lengthening of the femur and then bilateral tibia lengthening in other sections or vice versa, at a different time was named consecutive bilateral lengthening (CBL). All patients were followed until at least 18 years old. The physeal arrest was measured with predicted final length at the first visit (investigated with the multiplier method), the total amount of lengthening, and final clinical, and radiological length. Mean limb lengthening was 145 mm (48.5%) and 151 mm (46.6%) for simultaneous and consecutive groups respectively. For lower extremity length, the first group reached 527.6 mm while the expected was 447.3 mm. Considering 151 mm lengthening, the mean growth disturbance for the SBL group was 70.7 mm and for the CBL group was 47.5 mm. For total height comparing between two groups, disturbance for height was 80.5 mm and 65.4 mm, respectively. Although there was no statistical difference, simultaneous bilateral femoral and tibial lengthening has more physiological physeal disturbance effects than consecutive lengthening in patients with achondroplasia.

我们的目的是回顾性调查和比较接受双侧同步和连续股骨和胫骨延长手术的患者对骨骺生长的影响。我们假设与顺序延长技术相比，同时延长双侧股骨和胫骨会更大程度地影响骨骺生长。本研究纳入了 26 名 1995 年至 2015 年间在我们诊所进行肢体延长手术的软骨发育不全患者。14例双侧股骨和胫骨同时延长的患者被命名为同时双侧延长（SBL）。12 名患者双侧股骨延长，然后在其他部分进行双侧胫骨延长，反之亦然，在不同时间被命名为连续双侧延长 (CBL)。所有患者均被随访至至少 18 岁。第一次就诊时用预测的最终长度（用乘数法研究）、延长的总量、最终临床和放射学长度测量骨骺停滞。同时和连续组的平均肢体延长分别为 145 毫米 (48.5%) 和 151 毫米 (46.6%)。对于下肢长度，第一组达到 527.6 毫米，而预期为 447.3 毫米。考虑到 151 毫米的延长，SBL 组的平均生长障碍为 70.7 毫米，而 CBL 组为 47.5 毫米。对于两组之间的总身高比较，身高干扰分别为 80.5 毫米和 65.4 毫米。虽然没有统计上的差异，