1. Due to... --> Because
2. the surgery may lead to disbility --> the procedure may introduce disabilities
3. the professional doctors --> the specialists or the experts. (becasue every doctor is a professional)
4. None patient --> None
5. and even disabled --> 加一个主语，这样 and some (or all) were even disabled，要不然好像none was even disabled
6. 19-years old --> 19 years old
7. could walk by himself --> could walk on his own
8. climbed the stairs of hospital building --> climbed stairs in the hospital，不需要building
9. his legs had a kind of deformity --> his legs were bit deformed
10. his two legs --> his both legs
11. great hopes --> great hope
12. signed their signature on the contract --> signed the contract. 什么是contract? 是不是consent?
13. could walk as well before surgery --> could walk as well before the surgery
14. After surgery --> After the surgery
15. the muscles of his feet and legs started to shrink and are now obviously deformity --> muscles of his feet and legs started to atrophy and now his lower extremities are apparently deformed
16. for his urology disease--> for his incontinence
17. his original urology disease is more serious --> his previous incontinence gets more severe