Atypical Periprosthetic Joint Infection Post-Total Knee Arthroplasty: A Case of Actinomyces europaeus.

Periprosthetic joint infection (PJI) is a significant complication following total knee arthroplasty (TKA), representing a substantial challenge due to the difficulty in diagnosis and management. The main causes are predominantly common bacteria, but rare pathogens such as can complicate diagnosis and treatment. We report a unique case of a 75-year-old Caucasian patient with a history of multiple comorbidities including obesity, arterial hypertension, total thyroidectomy, rheumatoid arthritis, and prior venous thrombosis.

Population mobility, well-mixed clustering and disease spread: a look at COVID-19 Spread in the United States and preventive policy insights.

The epidemiology of pandemics is classically viewed using geographical and political borders; however, these artificial divisions can result in a misunderstanding of the current epidemiological state within a given region. To improve upon current methods, we propose a clustering algorithm which is capable of recasting regions into well-mixed clusters such that they have a high level of interconnection while minimizing the external flow of the population towards other clusters. Moreover, we analyze and identify so-called core clusters, clusters that retain their features over time (temporally stable) and independent of the presence or absence of policy measures.

Review of calcium-sulphate-based ceramics and synthetic bone substitutes used for antibiotic delivery in PJI and osteomyelitis treatment.

Infection in orthopaedic and trauma surgery remains a destructive complication with particularly challenging diagnosis and treatment due to bacterial antibiotic resistance and biofilm formation.Along with surgical debridement and systemic antibiotics, an important type of adjuvant therapy is local antibiotic delivery, with the purpose of eliminating bacterial colonization and biofilm development.Calcium sulphate, as a synthetic absorbable biomaterial used for local antibiotic delivery, has experienced an increasing popularity during the last decade, with multiple promoted advantages such as predictable antibiotic elution kinetics, complete and quick biodegradation, good biocompatibility, and limited associated complications.

Proximal humerus chondrosarcoma in a young male patient.

Proximal humerus chondrosarcoma is a rare localization of the common primary malignant cartilaginous tumor. Management is based on oncological surgical excision because of the inherent resistance to chemotherapy and radiation therapy. The most important prognostic factors with great impact on treatment strategy are histological grading and localization of the tumor.

Failure Analysis of Retrieved Osteosynthesis Implants.

Failure of osteosynthesis implants is an intricate matter with challenging management that calls for efficient investigation and prevention. Using implant retrieval analysis combined with standard radiological examination, we evaluated the main causes for osteosynthesis implant breakdown and the relations among them for a series of cases. Twenty-one patients diagnosed with implant failure were assessed for this work.

Current review of surgical management options for extremity bone sarcomas.

Modern surgical management of extremity bone sarcomas is governed by limb-sparing surgery combined with adjuvant and neoadjuvant chemotherapy.All the resection and reconstruction techniques have to achieve oncologic excision margins, with survival rates and functional results superior to amputation.The main reconstruction techniques of bone defects resulted after resection are: modular endoprosthetic reconstruction; bone graft reconstruction; bone transport; resection arthrodesis; and rotationplasty.

Chondrosarcoma of the pelvis - case report.

Chondrosarcoma (CHS) is the third most common primary bone tumor after myeloma and osteosarcoma. Histologically, it is made of pure hyaline cartilage differentiation. The tumor itself may have myxoid modification and calcification.