Aims

This aim of this study was to analyze the detection rate of rare pathogens in bone and joint infections (BJIs) using metagenomic next-generation sequencing (mNGS), and the impact of mNGS on clinical diagnosis and treatment.

The aim was to identify the acetabular center, fix the acetabular implant, and reconstruct the hip rotation center using the residual Harris fossa and acetabular notch as anatomical markers during revision hip arthroplasty. Osteolysis is commonly found in the acetabulum during hip arthroplasty revision. It causes extensive defects and malformation of the anatomical structure, making correct fixation of a hip prosthesis difficult. We studied the relations of the anatomical positions between the Harris fossa and acetabular notch and the acetabular center (Fig. 1). Vertical distance from the hip rotation center to the teardrop connection and horizontal distance from the hip rotation center to the teardrop were measured on preoperative and postoperative radiographs. Vertical distance increased from 14.22±3.39 mm preoperatively to 32.64±4.51 mm postoperatively (t=3.65, P<0.05) and the horizontal distance from 25.13±3.46 mm to 32.87±4.73 mm (t=2.72, P<0.05). Altogether, 28 patients underwent revision hip arthroplasty based on the Paprosky classification for bone loss. The anatomical hip center was identified using the residual Harris fossa and acetabular notch as anatomical markers during revision hip arthroplasty. Based on these relations, we were able to place the hip prosthesis correctly. After surgery, restoration of the anatomical hip center was accomplished based on data obtained from radiographs(Fig.2 and Fig.3).