I did my tibia in Russia and at 4.5 cm I am hardly experiencing any problems. Ballerina, knee contractures, etc. All these problems plagued many people when they are at 5 cm. I don't see myself encountering the same problems any time soon (my dorsiflexion is still 10-15 degrees most of the time).
Could this be because my bone length as measured by MRI is the average American bone length? I am 174 cm (2 cm lower than the average American) but my tibia length is the same as the average American.
Considering that most people who do LL have lower than average heights, would it be an indicator of success/less troubles and complications when lengthening (and post-lengthening), if you have longer bone length?
For instance, Korean and Chinese surgeons recommend to lengthen 15-20% of original bone length.
In other words, could a longer bone length mean that your soft tissues are more amenable to stretching and thus you can lengthen a greater absolute figure. Eg, someone who is 150 cm( and much shorter tibia) can probably encounter problems at 4 cm (I read a Kurgan story), but someone with an average height (and thus longer tibia) can probably encounter problems at only 6 cm, or more.
Even below 4 cm, many are bed bound, cannot walk well, and have all sorts of nerve issues, etc. I am at 4.5 cm and I am amazed I am actually doing well. I am doing better, in fact, than when I was 3 cm.