study is to assess the clinical and radiological results of Comminuted fractures of the midshaft of the tibia; treated with interlocking nail +/- blocking screws or locked plating with predicted distribution of locking screws, choice based on finite element analysis correlated with clinical outcome and union.

FE analyses will be performed using the finite element code COSMOS/M. The three-dimensional "lower leg" FE model (LL FE model) will be used included the tibia and the fibula. The bony structures will be generated by segmentation of a data set of computed tomographies from the Visible Human Project.

Analysis of data regarding clinical outcomes and radiological assessment of healing rate and union

Inclusion Criteria:

1. patients with closed comminuted fractures of the midshaft of the tibia
2. patients with age ranging from 25 to 45 years old

Exclusion Criteria:

• 1- Simple fractures of the midshaft of the tibia. 2- patients with open comminuted fractures of the midshaft of the tibia. 3- critical and ICU patients. 4- patients with ipsilateral lower limb fractures.

Patient with comminuted fractures of the midshaft of the tibia.

Data about the age and Phone to recall the patients. Data about Radiological investigation to be addressed by the finite element analysis