ABSTRACT
Primary articulation of bipolar hemiarthroplasty systems is at the femoral head-liner interface. The purpose of this study was to compare observed damage modes on 36 retrieved bipolar systems with implant, demographic, intraoperative, and radiographic data to elucidate the effects of component design, specifically locking mechanism, on clinical performance. Retrieved bipolar hip hemiarthroplasty systems of 3 different design types were obtained, disassembled, and evaluated macro- and microscopically for varying modes of wear, including abrasion, burnishing, embedding, scratching, and pitting. Clinical record review and radiographic analysis were performed by a senior orthopedic surgery resident. Average bipolar hip hemiarthroplasty system term of service was 46 months (range, 0.27-187 months). All devices contained wear debris captured within the articulating space between the femoral head and liner. In 31% of patients without infection, lucency was observed on immediate prerevision radiographs. The system with a leaf locking mechanism showed significantly increased radiographically observed osteolysis (P=.03) compared with a system with a stopper ring locking mechanism. In addition, implant design and observed damage modes, including pitting and third-body particle embedding, were significantly associated with radiographically observed osteolysis.
Subject(s)
Femoral Neck Fractures/surgery , Hemiarthroplasty/methods , Hip Prosthesis , Aged , Aged, 80 and over , Female , Femoral Neck Fractures/diagnostic imaging , Follow-Up Studies , Humans , Male , Middle Aged , Prosthesis Design , Prosthesis Failure , Radiography , Reoperation , Retrospective StudiesABSTRACT
The purpose of this study was to examine the effects of intra-articular epinephrine lavage on blood loss following total knee arthroplasty (TKA). Our retrospective study involved 189 patients who had primary cemented TKA by 1 of 2 surgeons. Surgeon 1 performed 41 procedures without and 53 with the epinephrine lavage. Surgeon 2 performed 41 procedures without and 54 with the epinephrine lavage. We compared calculated blood loss (CBL) for the patients in all 4 groups. We found no significant differences in CBL among the patients in the 4 patient groups. Our results show that an intra-articular epinephrine lavage does not affect blood loss after TKA.
Subject(s)
Arthroplasty, Replacement, Knee/adverse effects , Blood Loss, Surgical/prevention & control , Epinephrine/administration & dosage , Vasoconstrictor Agents/administration & dosage , Adult , Aged , Aged, 80 and over , Cohort Studies , Humans , Middle Aged , Retrospective Studies , Therapeutic IrrigationABSTRACT
A case report regarding the fracture of an alumina ceramic femoral head used in ceramic-on-ceramic total hip arthroplasty is presented. The patient, who was seen in the emergency room with pain, grinding, and instability in the hip immediately after a slip-without-fall event, also reported having fallen from a height of 8 ft 6 months earlier. Characterization of the alumina fracture surfaces by light and scanning electron microscopy suggests that the previous fall may have favored the nucleation and growth of subcritical cracks in the ceramic, which lead to fracture during the slip-without-fall event. The case report addresses the significance of impact trauma on the structural integrity of ceramic materials, which should not be ignored by patient or physician regardless of perceived severity.
