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The absolute indications for lower limb replantation are not unequivocally established; rather, this procedure is still challenging and controversial. We report a case of a young male who underwent bilateral leg amputation, followed by unilateral replantation. The patient demonstrated good 10-year outcomes. A 23-year-old man had both of his lower legs crushed by heavy machinery that fell from the back of a truck, leading to amputation of bilateral lower limbs. Although bilateral amputation was recommended due to severe contusion on both sides, the patient and his family strongly requested replantation of the right leg, and surgery was started approximately 3 h after the injury. In addition to the emergency replantation, six surgeries were performed thereafter. Five months after the first surgery, the patient was fitted with a left lower leg prosthesis and started gait training. He was discharged 8 months later. Ten years after the replantation, the patient is satisfied with his leg. He has a normal gait with a prosthesis and has integrated into society with no functional deficit. There are still no clear standards for replantation after leg amputation, and individual decisions must be made based on the severity of the injury and the patient's general condition. In this case, we respected the patient's strong will to preserve the right leg and decided on the treatment plan. As a result, the patient was highly satisfied, and the spared right leg facilitated the patient's physical and mental recovery.

Background: While various implants are currently used for the treatment of femoral trochanteric fractures in Japan, ‘mismatches’ have been known to occur between patient and implant type. The purpose of this study is to identify morphological characteristics of elderly Japanese females, both in terms of the shape of proximal femur and its anterior curvature in order to evaluate the suitability of implants for treatment of femoral trochanteric fractures using 3D-computed tomography (CT) scanning.Methods: This study used CT scan data taken from 50 elderly females (aged 70 years or older). Neck–shaft (NS) angle and height of the greater trochanter (GT) were measured under defined conditions (TPI: theoretical plane to place implant). Anterior curvature of the femoral shaft was also measured.Results: On average, the NS angle was found to be 128.1° and GT height was 62.4 mm. Average curvature radius was 1040 mm. As for the NS angle, the centrum-collum-diaphysis angles of existing implants (125° or 130°) are reasonable. In elderly Japanese patients, the proximal femur shows specific characteristics. As GT height is very short, the implant may easily interfere with the lateral cortex. Additionally, the curvature radius calculated (1040 mm) was smaller than that of past reports, indicating strong curvature in the Japanese elderly.Conclusion: Our measurement results are potentially useful in the avoidance of intraoperative trouble caused by mismatch of implants.