a level iii prognostic study suggests that higher range of motion of the implanted segment may be associated with better outcomes, whereas 2 level iv therapeutic studies provide conflicting results.
一项iii级的预后性研究提示植入节段更大范围的活动度可能和更好的功能结果相关,然而另外两项iv级治疗性研究则提供了截然相反的结果。