In patients with coccygeal pilonidal sinus disease, a single-stage incision and lay open of the sinus tract is the most efficient operation, especially during emergency surgery.

Background and Aims Safety of kidney biopsy is variably reported in different published series. Since 2014, all native kidney biopsies undertaken in the 9 adult renal units in Scotland have been recorded by the Scottish Renal Registry (SRR) and since 2015 all transplant kidney biopsies were included. In this complete national dataset, we report data on safety of kidney biopsy in a current real world setting. Method Major complications of kidney biopsy are recorded using pre-defined terms and include: arteriography and embolisation, arteriography no embolisation, clot retention, blood transfusion only, death within 28 days directly attributable to biopsy, nephrectomy and other. Biopsies are undertaken under ultrasound guidance using 16G or 18G spring loaded biopsy guns. All centres discontinue clopidogrel, DOACs and warfarin. Some centres continue aspirin. In some centres biopsy is performed by nephrologists and in others by radiologists Results In total, 6979 biopsies in 5755 patients were recorded between 2014 and 2021 (5095 native biopsies and 1884 transplant biopsies), with an adequacy for diagnosis of 98.1%. Table 1 describes the demographics, indications, operator and diagnoses made by biopsy type. Overall, in patients undergoing native kidney biopsy 2.4% suffered a major complication and 1.4% of patients undergoing transplant biopsy. The commonest complication was the requirement for arteriography, with or without embolisation. We included CT angiography in this group. There were 8 deaths within 28 days attributable to renal biopsy. Conclusion Kidney biopsy remains safe for the vast majority of patients and complications are less likely with transplant biopsy.

Introduction: Mega endoprosthesis replacement for resection of primary malignant bone tumour requires immediate and long-term stability, particularly in the young and active patient. Extracortical bone bridge interface (EBBI) is a technique whereby autograft is wrapped around the interface junction of bone and porous-coated implant to induce and enhance bone formation for biological incorporation. This procedure increases the mean torsional stiffness and the mean maximum torque, which eventually improves the implant's long-term survival. Material and methods: The extracortical bone bridge interface's radiological parameter was evaluated at the prosthesis bone junction two years after surgery utilising a picture archiving and communication system (PACS). The radiograph's anteroposterior and lateral view was analysed for both thickness and length in all four cortices. The analysis was done in SPSS Version 24 using One-Way ANOVA and independent T-Test. Results were presented as mean and standard deviation and considered significant when the p-value was < 0.05. Results: The mean average thickness was 2.2293mm (SD 1.829), and the mean average length was 31.95% (SD 24.55). We observed that the thickness and length of EBBI were superior in the young patient or patients with giant cell tumour that did not receive chemotherapy, compared to patients treated for osteosarcoma. The distal femur also had better EBBI compared to the proximal tibia. However, the final multivariable statistical analysis showed no significant difference in all variables. EBBI thickness was significantly and positively correlated with EBBI Length (p<0.001). We conclude that, for each 1mm increase in EBBI thickness, the length will increase by 0.06% on average. About 17.2% of patients out of the 29 showed no radiological evidence of EBBI. Conclusion: From our study, there were no factors that significantly contributed to the formation and incorporation of EBBI

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