Introduction: Treatment of orbital floor fractures （OFFs） using an absorbable plate is a common procedure, but there is no current consensus on surgical follow-up. We examined positional changes of orbital bone fragments after treatment of OFFs and multiple follow-up regimens.
　Methods and Materials: Data on the treatment of OFFs using absorbable plates between April 2009 and March 2017 were analyzed. Twenty-eight cases, all of which were able to be evaluated postoperatively, were included. Using CT coronal images, longitudinal changes were measured over time by calculating the distance between the bone fragment and absorbable plate （FPD）, the distance between the plate and upper orbit （POD）, and total of both distances （TD）. We compared these changes between the unsintered hydroxyapatite （u-HA）+ poly-L-lactide （PLLA） and polyglycolic acid （PGA）+ PLLA groups.
　Results: The FPD decreased in all 28 cases after surgical intervention; however, the POD did not change from the preoperative value. The FPD of the u-HA + PLLA group was markedly shortened, taking approximately 34-37 weeks.
　Discussion: There was a noticeable difference in FPD between plates with different follow-up periods. It may be necessary to use a plate capable of maintaining its strength for 34-37 weeks to sufficiently support the orbital bone fragment when reconstructing the orbital floor.

　Mediastinitis with artificial graft infection is difficult to treat and is a serious complication that may result in death. In principle, removal of the infected artificial graft and replacement surgery are considered, but removal may be difficult due the level of difficulty and invasiveness. We performed wound bed preparation using negative-pressure wound therapy and infection control by two-stage reconstructive surgery after sufficient debridement for mediastinitis with artificial graft infection.
　We consider removal and replacement of the infected artificial graft, but if it is difficult due to problems, such as the general condition of the patient, it is important to completely cover the artificial graft with omental and muscle flaps after the infection subsides and sufficient wound bed preparation is obtained.

　For tumorectomy involving a defect of the pelvic floor, body-surface plasty and muscle/soft tissue filling are necessary. Gracilis myocutaneous flaps have the following advantages: they do not interfere with laparoscopic surgery; there is no necessity of intraoperative postural change; and the site of flap placement is out of the preoperative irradiation field. Objective: We investigated the stability and issues of reconstruction of pelvic floor defects after tumorectomy with short gracilis myocutaneous flaps. Subjects and Methods: The subjects were 6 patients who had undergone reconstruction of pelvic floor defects after tumorectomy with short gracilis myocutaneous flaps in our department between May 2017 and October 2018. Results: In all patients, flap survival was achieved. The mean age was 66.3 years. The subjects consisted of 2 males and 4 females. The mean pelvic floor defect size was 5.8 cm. Reconstruction with a unilateral flap was performed in 4 patients, and that with bilateral flaps in 2. Complications were observed in 2. Discussion: The results of reconstruction are stable in patients for whom this procedure should be indicated; this procedure is useful. However, there may be a shortage of reconstructive tissue in those with extensive tissue defects.