Evaluation of the optimal area of surgical incision for total knee arthroplasty in patients with old scars

Determining the best area for surgical incision of complete knee joint replacement in patients with old scars in Hazrat Rasool Akram Hospital.

Clinical trial of control group with randomized double-blind parallel groups with 44 patients

In the control group, patients will be subjected to a new incision at a safe distance of 7 to 8 cm from the old scar by the standard method, and in the intervention group, patients will undergo an incision at a closer distance on the patient's knee. The results of the study will be evaluated and compared in terms of the possible occurrence of any skin complication in patients and the general results of surgery in the time intervals of 1 week, 2 weeks and 1 month after surgery.

The patient is a candidate for complete knee replacement surgery. Age over 15 years in a patient The patient has an old scar caused by a previous surgical incision or lesion in the skin of the knee

The incision site in both groups. In the intervention group, the incision site is cut midline regardless of the scar site, but in the control group, the incision site is incised at a distance of 8 cm from the scar site.

Age / sex / old scar / length of old scar / distance from surgical incision to old scar / type of previous surgery / skin necrosis after surgery

After selecting the participants in the study using inclusion and non-inclusion criteria, to prevent the occurrence of bias in the selection of participants to intervention and control groups, we will use the randomization method to minimize the opinion of researchers in selecting participant to study groups. The block randomization method was used in this study. The size of the blocks is considered to be four and will be selected randomly so that it is not predictable to the participants based on the blocks. First, we will receive using Random Allocation software and by determining the sample size, the number of groups, the type of randomization and is random the order of the blocks in the software output and will be shown in the software output of groups with letters A and B. Then, after selecting each patient based on the inclusion and non-inclusion criteria, the project manager will be informed and he will tell the type of intervention of that patient based on the order of inclusion of patients and compliance with the number mentioned in the randomization output.

After obtaining informed consent and explaining that the selection in each group is done randomly by the program and how each group is done, the participants are divided into two groups without knowing which group they are in Obviously, if any of the participants object, it will be removed from the study list and routine treatment will be performed according to the protocol And the analyzer does not know which group each patient is in.