UNASSIGNED: Long recovery time, large scar, postoperative swelling and pain are possible side effects of open reduction internal fixation (ORIF) for tarsal navicular fractures. Early exercise instruction is made possible by the use of an intraoperative robot-assisted percutaneous invasive closed reduction internal fixation. The goal of the trial was to determine whether percutaneous screw internal fixation with robot assistance might be used to treat navicular fractures.
UNASSIGNED: 27 patients with navicular fractures had surgical treatment between June 2019 and December 2021. Of those, 20 instances were treated with ORIF, while 7 cases had robot-assisted percutaneous screw internal fixation. At the final follow-up, the American Orthopaedic Foot & Ankle Society (AOFAS) hindfoot score and the visual analogue scale (VAS) score were compared to determine outcomes and function.
UNASSIGNED: Follow-up was obtained in all 27 patients after surgery, with a mean follow-up time of 21.81 months, ranging from 15 to 29 months . In the 7 instances of robot-assisted group, percutaneous guide wire insertion and screw placement only needed one attempt and the depth and position of the implant were both satisfactory. In the ORIF group, there were two patients who sustained cutaneous nerve injuries. The AOFAS score and the VAS score of the group receiving robot-assisted navigation percutaneous screw fixation were 92.25 ± 2.22 and 0.75 ± 0.25 respectively at the last follow-up, while 82.25 ± 7.15 and 0.50 ± 0.29 were the respective values for the ORIF group.
UNASSIGNED: Intraoperative robot-assisted percutaneous closed reduction internal fixation for tarsal navicular fractures can accomplish exact localization of fracture site, reduce soft tissue damage and operative time. According to current view, this method offers fewer complications, a faster recovery after surgery, and more patient satisfaction.

BACKGROUND: Mueller-Weiss disease is a rarely diagnosed deformity where the navicular bone undergoes spontaneous osteonecrosis in adults. Until now, there is no widely accepted operative treatment for this unusual disease. We aimed to compare clinical and radiological outcomes between the open triple fusion and talonavicular-cuneiform arthrodesis for Mueller-Weiss disease of stage 4.
METHODS: During the period from February 2012 to June 2016, 10 patients (11 feet) suffering from Mueller-Weiss disease of stage 4 were treated by the same senior surgeon. Among them, 5 patients (5 feet) were treated with open triple fusion and 5 patients (6 feet) were treated with talonavicular-cuneiform arthrodesis. Clinical outcomes were evaluated by American Orthopaedic Foot and Ankle Society (AOFAS) ankle-hindfoot score. Radiological results were assessed based on the X-ray and CT. Postoperative complications were also recorded.
RESULTS: There were no significant differences in AOFAS score between the two groups (p = 0.1 > 0.05). For the open triple fusion, the average AOFAS ankle-hindfoot score improved from 30.2 ± 3.27 preoperatively to 79 ± 3.81 at the last follow-up (p = 0.008). And for the talonavicular-cuneiform (TNC) arthrodesis, the average AOFAS ankle-hindfoot score improved from 33.2 ± 5.63 preoperatively to 86.2 ± 3.49 at the last follow-up (p = 0.007).
CONCLUSIONS: Both triple fusion and TNC arthrodesis are reasonable methods for the treatment of Mueller-Weiss disease if properly used. It is crucial to use radiological assessment to evaluate the involved joints preoperatively and then chose the appropriate method to treat different patients.

We describe a rare case of intraosseous Schwannoma in the foot involving the tarsal navicular, cuboid, all 3 cuneiforms, and the second and third metatarsal bases in a 50-year-old female. Radiographs revealed a large, well-defined osteolytic lesion with endosteal scalloping and trabeculated contours at the margins. Intralesional excision, allograft bone implantation, and Kirschner wire fixation were performed. The histologic and immunohistochemical studies confirmed the diagnosis of Schwannoma. The distinctive radiographic features might have been the result of tumor spreading within the nutrient canals of the bones and direct compression of bone as the tumor enlarged. At the 18-month follow-up point, the patient had recovered well without recurrence. Intralesional excision produced a good functional outcome; however, extensive fusion surgery is recommended.

This is a case report of 31-year-old woman who sustained medial subtalar dislocation with navicular and entire posterior talar process fracture. After closed reduction of the subtalar dislocation, compute tomography (CT) demonstrated that the talus fracture involved the entire posterior process and navicular. The fracture of the talus was fixed with a cannulated screw and the navicular was held with two K-wires to the main body using with a minimally invasive approach. Follow-up revealed that the functional and radiographic results were graded as good.