Whether the injured instep skin graft can be evaluated, the specific rating needs to be comprehensively evaluated according to the Appraisal Standard of Workers' Injury and Occupational Disease Disability. This standard specifies in detail the appraisal standards of different degrees of disability. Among them, the terms related to skin grafting include: the area of skin grafting on the dorsum of foot is greater than 100 square centimeter, etc. The specific score will be based on the skin graft area, the number of operations, the recovery situation and many other factors.

In the case you mentioned, the instep was transplanted and hospitalized for one and a half months, which may meet a certain level of disability standards. However, the specific rating requires professional evaluation by the labor ability appraisal Committee, which will make a judgment based on detailed medical records, surgical reports and your recovery.

In order to obtain more accurate rating information, it is recommended that you keep all relevant medical documents and materials during the recovery period and apply to the labor ability appraisal committee at an appropriate time. They will give the final rating results according to your specific situation and relevant standards.

Please note that the rating results may affect your work-related injury compensation and related treatment, so please pay attention to and actively cooperate with the investigation and evaluation work of relevant departments. At the same time, I hope you can keep a good attitude, actively face the process of treatment and rehabilitation, and get well soon.