There's a public korean forum for limb lengthening in a famous website called "NAVER". It's basically Korean Google.
I really like that Dr.Donghoon Lee does not censor anything and tries to be as transparent as possible.
Amongst other things, do note that this is a small percentage of patients. Most patients will NOT post on the cafe unless they have troubles and very very few people(less than 50) have posted any sort of "after surgery" or questions. Therefore, take this with a grain of salt.
There are multiple patients for Dr.Donghoon Lee at the moment. There are not enough rooms for 4 people and they can only stay in solo rooms.
Solo rooms cost alot more and have very small space for the price.
He prefers tibia over femur lengthening like many doctors in Korea. He has had many surgeries the past decade and the volume of patients has gone up.
The 'safe limit' is different for everyone but the limit for tibia is around 6cm. There is no limit for femur but most patients are around 5-6.5cm therefore we can conclude that it is roughly the same limit as tibia.
He has advertised stem cell therapy for bone regeneration, however he only uses it for those who are slow at bone recovery. It is actually proven to work and isn't snake oil suprisingly.
This is his outcome of patients using his cafe
-Able to exercise and extert force like before. Practically same without surgery.(6.5cm/femur PRECICE2). He said that he is the best recovered patient amongst all that he saw including other femur PRECICE2 patients.
-Able to exercise and extert force. Hasn't tried to exercise intensely but he can't see why it wouldn't work.(5.5cm/PRECICE femur)
-Able to exercise and extert force. Has been going to the gym for a while. There are no problems with his legs and it practically doesn't feel any different. Fast movement(very intense running) is slower than before. His speed has gone down slower and his leg stamina has also gone down. It's not painful, he explained as a heavyness on his leg like you would be after walking/running for a long time. Albeit it comes faster than before.(LON tibia 6.3cm)
-Able to exercise and extert force. He has about 90% of his previous ability. Nothing really changed for him and very satisfied with his surgery.(LON 6cm tibia)
-Everything is same as before surgery other than crossing legs and intense exercise. Roughly 85% recovery as stated by her. Still hasn't gotten nail removed, 2 years after initial surgery.(7cm tibia LON/Asian female patient)
-6 years since surgery. Is able to dance/walk/run/heavy lifting. Practically same as before. However, he is unable to run as fast as before. (7cm tibia LON)
-7 years since surgery. Is able to function normally in life and can lift/walk. Unable to run like before and heavy exercise is still too exhausting. He said that if a robber hit him and run, he wouldn't be able to catch up to him. Said that his tibia still does not feel strong. If he gets hit in his tibia, it hurts very much so. One of the worst cases seen in the forums.(7cm tibia LON. 170cm->177cm)
-7 years since surgery. He says that he is infact faster and stronger than his before-surgery state. He loves soccer and plays it everyday, he says that he is even better at it than before surgery. He has been one of the best results for the surgery. Many patients and himself says it is because he did recovery exercises for 14 hours every day and only took breaks while eating and sleeping.(5.7cm LON tibia 166cm->171~172cm)
-Hasn't talked about running but seems to be functioning well. 1.5 year since surgery and hasn't gotten nail removed yet. Last post was asking Dr.Donghoon Lee if he could leg press more than he is doing currently.(80kg/roughly 180 pounds).(6.4cm LON tibia/hasn't gotten nail removed).
-Worst case yet in Dr.Donghoon Lee's cafe. Is unable to function well in society. Cannot move his foot muscles properly(pain and freezes up). It is in a constant state of pain even without moving. He is able to walk but cannot run properly. No problems with his bones but his muscles have been diagnosed as a disease.(Involuntary movement) Dr.Donghoon Lee has been attempting to take care of him and used his name as a reference him to Severence Hospital for a diagnosis. Still has NOT been resolved. It has been 2 years since surgery. Says it started after removing his external fixator and putting the nail in(2nd surgery). He thinks it may have to do with his broken pin that happened in his first surgery. Still has not been solved.(posted less than a month ago)
There are more but most of them are incomplete without updates.(Only posts about the first few months of surgery.)