One-Stage Arthroplasty or Revision for Seronegative Infections in Hip and Knee

Does the duration of antibiotic treatment following one-stage treatment of infected total knee arthroplasty influence the eradication rate? A systematic review

PURPOSE

The aim of this study was to perform a systematic review of the current literature to elucidate the optimal duration of systemic antibiotic therapy following one-stage revision TKA in the setting of PJI.

METHODS

We conducted an electronic search in four databases including Medline (PubMed), Scopus, Web of Science, and Cochrane Central Register of Controlled Trials without any publication date, language or study design filter on October 1, 2022. The search strategy adhered to PRISMA guidelines and consisted of four main keywords categories which were knee arthroplasty or knee prosthesis, infection and one-stage/single-stage revision. Duration of antibiotic administration were classified to three groups: short-term IV therapy (≤ two weeks), short-term IV therapy plus oral therapy, and long-term IV therapy (minimum six weeks).

RESULTS

We identified 963 studies, of which 21 were included in the systematic review. Coagulase-negative Staphylococcal species were the most frequently isolated pathogens. The mean eradication rate for all the studies analyzed was 88.4% (range, 62.5-100%). Short-term IV + long-term oral antibiotic therapy demonstrated significantly higher eradication rate compared to the other two regimens following one-stage revision TKA (p = 0.023) (Table 4). In the ten studies with great than five years of follow-up, this difference was no longer statistically significant. Subgroup analysis of antibiotic-loaded cement (ABLC) usage demonstrated higher eradication rates with short-term IV + long-term oral (92.8%) and long-term IV antibiotics (89.7%) compared to short-term IV antibiotics alone (p = 0.006).

CONCLUSION

We demonstrated that short-term IV antibiotics followed by oral antibiotics had similar eradication rates to long-term IV antibiotics in long-term studies, which were both superior to short-term IV antibiotics alone. Nevertheless, there remains a need for prospective and randomized studies to further elucidate a patient-based protocol for the type and duration of antibiotic use following one-stage PJI treatment of the knee.

Overexpression of miR-532-5p restrains oxidative stress response of chondrocytes in nontraumatic osteonecrosis of the femoral head by inhibiting ABL1

This study is to probe into the meaning of serum miR-532-5p in nontraumatic osteonecrosis of the femoral head (ONFH), and a molecular mechanism of miR-532-5p in the development of nontraumatic ONFH. This study enrolled 96 patients diagnosed with nontraumatic ONFH and 96 patients with femoral neck fracture. The levels of miR-532-5p, ABL1, MMP-3, MMP-13, and cleaved-caspase3 were determined. Radiographic progression was assessed by ARCO staging system. Visual analog scale (VAS) and Harris hip score (HHS) were employed for evaluation of the symptomatic severity of nontraumatic ONFH. Cell viability and apoptosis in chondrocytes isolated from clinical samples were investigated with CCK-8 and flow cytometry. The levels of lactic dehydrogenase (LDH), superoxide dismutase (SOD), and malondialdehyde (MDA), mitochondrial membrane potential (ΔΨm), and reactive oxygen species (ROS) were determined. miR-532-5p was downregulated in tissues and serum of patients with nontraumatic ONFH, negatively related with ARCO staging and VAS, and positively correlated with HHS. Cell apoptosis, LDH, MDA, and ROS strengthened, while cell viability, ΔΨm, and SOD reduced in chondrocytes of nontraumatic ONFH patients. ABL1 was upregulated in cartilage tissues from nontraumatic ONFH patients. miR-532-5p targeted ABL1, and overexpressed miR-532-5p alleviated nontraumatic ONFH-induced oxidative stress damage of chondrocytes by restraining ABL1. miR-532-5p ameliorated oxidative stress injury in nontraumatic ONFH by inhibiting ABL1.

Periprosthetic Knee Infection - Part 2: Treatment

Several treatment modalities are proposed for periprosthetic infections, with variable success rates. However, efficacy is related to the appropriate selection of cases for each type of treatment. Debridement with implant retention is indicated in acute infections with fixed implant, and its success depends on the type of infection, comorbidities of the host, and virulence of the etiological agent. One- or two-stage revision is required in cases in which biofilm is forming, or of implant loosening. The choice between performing the review in one or two stages depends on factors such as etiological agent identification, pathogen virulence, local and systemic host factors. Rescue procedures such as arthrodesis, amputation, resection arthroplasty or even antibiotic suppression are reserved for cases in which the infection has not been eradicated.