Lower synovial leucocyte count and polymorphonuclear percentage reliably differentiate periprosthetic joint infection after unicompartmental knee arthroplasty.

Purpose: This study aimed to determine diagnostic thresholds for synovial fluid leucocyte count and polymorphonuclear (PMN) percentage to identify the diagnosis periprosthetic joint infection (PJI) in patients with failed unicompartmental knee arthroplasties (UKAs).

Methods: This multicentre retrospective cohort study included 239 patients who underwent revision of an UKA for either septic or aseptic indications at five university-affiliated medical centres. Among these, 30 patients (13%) underwent revision for PJI and 209 (87%) for noninfectious causes.

Proximal Femoral Replacement in Revision Total Hip Arthroplasty: A 20-Year Experience.

Background: Proximal femoral replacement (PFR) is a salvage procedure in revision total hip arthroplasty for extensive femoral bone loss. This study aimed to evaluate implant survivorship, complications, patient mortality, and clinical outcomes of PFR for non-oncologic indications at mid-term follow-up (five years).

Methods: We reviewed 61 PFRs for nononcologic indications performed between 2000 and 2022 at a single academic institution.

Primary total hip arthroplasty using jumbo femoral heads (40 and 44 mm) : a series of over 1,800 patients.

Aims: The use of jumbo femoral heads, defined as those with a diameter of ≥ 40 mm, in primary total hip arthroplasty (THA) has gained popularity, to mitigate dislocation. The aim of this study was to determine the risk of dislocation, implant survival, and clinical outcomes of a large cohort of primary THAs with jumbo femoral heads.

Methods: We conducted a retrospective analysis of 1,828 primary THAs with jumbo femoral heads, which were undertaken for osteoarthritis, in 1,578 patients between January 2000 and December 2022, at a single academic medical centre.

Minimal changes in patella height after aseptic revision from unicompartmental to total knee arthroplasty.

Introduction: If revision of a unicompartmental knee arthroplasty (UKA) is required, converting it to a total knee arthroplasty (TKA) remains the favored approach. However, worse functional outcomes after revision from UKA to TKA are reported compared to primary TKAs. One potential driver may be a decline in patella height, limiting knee flexion, and increasing patellofemoral stress.

No shortening of the patellar tendon during two-stage total knee arthroplasty revision using articulating spacers.

Background: Surgical techniques in two-stage revision total knee arthroplasty (rTKA) include the use of articulating spacers and static spacers. Shortening of the patellar tendon could be a reason for inferior functional outcomes in two-stage septic rTKA . The aim of this study was to determine if articulating spacers also have negative effects on the extensor mechanism in rTKA.

Impact of intra- and extramedullary alignment on blood loss in total knee arthroplasty: a retrospective study.

Background: There is a scarcity of scientific data regarding the correlation between alignment techniques during total knee arthroplasty (TKA) and blood loss as well as transfusion rates. This study's hypothesis posited that intramedullary-aligned (IM) TKA exhibits higher blood loss and transfusion rates when contrasted with extramedullary-aligned (EM) TKA.

Methods: We conducted a retrospective examination of 883 patients who underwent total knee arthroplasty (TKA) in 2021 at a solitary orthopedic center in Germany.

Cemented and hybrid total hip arthroplasty lead to lower blood loss in primary total hip arthroplasty: a retrospective study.

Background: Little scientific evidence exists on blood loss and transfusion rates depending on the fixation technique. The hypothesis of this study was that the blood loss and transfusion rate are lower in cemented and hybrid total hip arthroplasty (THA) compared to cementless THA.

Methods: We retrospectively compared a total of 1500 patients who received either cementless, cemented, hybrid or reverse hybrid THA.