Total knee arthroplasty (TKA) is widely used in clinical practice as an effective treatment for end-stage knee joint lesions. It can effectively correct joint deformities, relieve painful symptoms, and improve joint function. The reconstruction of lower extremity joint lines and soft tissue balance are important factors related to the durability of the implant; therefore, it is especially important to measure the joint lines and associated angles before TKA. In this article, we review the technological progress in the preoperative measurement of TKA.

Objective The combination of lateral soft tissue release, medial soft tissue contraction, vastus medialis anterior placement, medial patellofemoral ligament reconstruction, and rectus femoris insertion reconstruction are introduced in the treatment of habitual patellar dislocation in adolescents. Methods A retrospective analysis was performed on 12 patients (17 knees) with habitual patellar dislocation and unclosed epiphyses who underwent surgical treatment at the First Hospital of Jilin University from May 2017 to November 2021. The Lysholm scores and Q angle were collected pre-operatively and at final follow-up and were compared. Results 12 patients (4 boys and 8 girls) aged 10–15 years were retrospectively analysed, who followed up for an average of 21 months (5–48 months). The range of motion of the knee joint returned to normal in all patients, and no cases of complications including surgical site infection, joint stiffness, or patellar re-dislocation occurred. The mean Lysholm scores and Q angles improved from 73.9, 19.6° preoperatively to 91.7, 13.9° at the final follow-up, respectively. Conclusion The preliminary effect of the combination surgery for habitual patellar dislocation in adolescents was satisfactory.

Objective: To analyze the role of the metagenome next-generation sequencing (mNGS) technique in identifying and treating the pathogen of orthopedic chronic infectious diseases. Methods: The data of patients diagnosed with orthopedic chronic infectious diseases by a surgical team of the Department of Joint Surgery of the First Hospital of Jilin University from June to December 2021 were retrospectively analyzed. mNGS and pathogenic bacterial culture were performed on these patients, based on which, in combination with clinical manifestations and treatment effects, the role of mNGS in the diagnosis of pathogenic bacteria was determined. Results: All of the 12 patients had pain and swelling of the affected limb before hospitalization. Pathogenic bacteria were detected in eight patients by mNGS and in three patients by routine bacterial culture. 10 kinds of pathogenic bacteria (Staphylococcus aureus, Streptococcus dysgalactiae, Pseudomonas stutzeri, Chaetomium globosum, Acinetobacter baumannii, Prevotella copri, Staphylococcus epidermidis, Sporothrix schenckii, Pseudomonas aeruginosaand Torque teno virus) were detected by mNGS. The same bacterium was detected in two cases by both mNGS and bacterial culture. Conclusion: The mNGS technique provides an important diagnostic basis for pathogen detection in orthopedic chronic infectious diseases.

Objective A combination of lateral soft tissue release, medial soft tissue contraction, vastus medialis anterior placement, medial patellofemoral ligament reconstruction, and rectus femoris insertion reconstruction are introduced in the treatment of habitual patellar dislocation in adolescents. Methods A retrospective analysis was performed on 12 patients (17 knees) with habitual patellar dislocation and unclosed epiphyses who underwent surgical treatment at the First Hospital of Jilin University from May 2017 to November 2021. The Lysholm scores and Q angle were collected preoperatively and at final follow-up and were compared. Results Twelve patients (4 boys and 8 girls) aged 10–15 years were retrospectively analysed, who followed up for an average of 21 months (5–48 months). The range of motion of the knee joint returned to normal in all patients, and no cases of complications including surgical site infection, joint stiffness, or patellar re-dislocation occurred. The mean Lysholm scores and Q angles improved from 73.9, and 19.6° preoperatively to 91.7, and 13.9° at the final follow-up, respectively. Conclusion The preliminary effect of the combination surgery for habitual patellar dislocation in adolescents was satisfactory.