ABSTRACT
Introduction: Fragility fractures of the pelvis (FFP) in elderly patients are an underappreciated injury with a significant impact on mobility, independency, and mortality of affected patients and is a growing burden for society/health care. Given the lack of clinical practice guidelines for these injuries, the authors postulate there is heterogeneity in the current use of diagnostic modalities, treatment strategies (both operative and nonoperative), and follow-up of patients with FFP. The goal of this study was to assess international variation in the management of FFP. Methods: All International Orthopaedic Trauma Association (IOTA) steering committee members were asked to select 15 to 20 experts in the field of pelvic surgery to complete a case-driven international survey. The survey addresses the definition of FFP, use of diagnostic modalities, timing of imaging, mobilization protocols, and indications for surgical management. Results: In total, 143 experts within 16 IOTA societies responded to the survey. Among the experts, 86% have >10 years of experience and 80% works in a referral center for pelvic fractures. However, only 44% of experts reported having an institutional protocol for the management of FFP. More than 89% of experts feel the need for a (inter)national evidence-based guideline. Of all experts, 73% use both radiographs and computed tomography (CT) to diagnose FFP, of which 63% routinely use CT and 35% used CT imaging selectively. Treatment strategies of anterior ring fractures were compared with combined (anterior and posterior ring) fractures. Thirty-seven percent of patients with anterior ring fractures get admitted to the hospital compared with 75% of patients with combined fractures. Experts allow pain-guided mobilization in 72% after anterior ring fracture but propose restricted weight-bearing in case of a combined fracture in 44% of patients. Surgical indications are primarily based on the inability to mobilize during hospital admission (33%) or persistent pain after 2 weeks (25%). Over 92% plan outpatient follow-up independent of the type of fracture or treatment. Conclusion: This study shows that there is a great worldwide heterogeneity in the current use of diagnostic modalities and both nonoperative and surgical management of FFP, emphasizing the need for a consensus meeting or guideline.
ABSTRACT
BACKGROUND: The most common modes of failure of cemented unicompartmental knee arthroplasty (UKA) designs are aseptic loosening and unexplained pain at short- to mid-term follow-up, which is likely linked to early fixation failure. Determining these modes of failure remains challenging; conventional radiographs are limited for use in assessing radiolucent lines, with only fair sensitivity and specificity for aseptic loosening. QUESTIONS/PURPOSES: We sought to characterize the bone-component interface of patients with symptomatic cemented medial unicompartmental knee arthroplasty (UKA) using magnetic resonance imaging (MRI) and to determine the relationship between MRI and conventional radiographic findings. METHODS: This retrospective observational study included 55 consecutive patients with symptomatic cemented UKA. All underwent MRI with addition of multiacquisition variable-resonance image combination (MAVRIC) at an average of 17.8 ± 13.9 months after surgery. MRI studies were reviewed by two independent musculoskeletal radiologists. MRI findings at the bone-cement interface were quantified, including bone marrow edema, fibrous membrane, osteolysis, and loosening. Radiographs were reviewed for existence of radiolucent lines. Inter-rater agreement was determined using Cohen's κ statistic. RESULTS: The vast majority of symptomatic UKA patients demonstrated bone marrow edema pattern (71% and 75%, respectively) and fibrous membrane (69% and 89%, respectively) at the femoral and tibial interface. Excellent and substantial inter-rater agreement was found for the femoral and tibial interface, respectively. Furthermore, MRI findings and radiolucent lines observed on conventional radiographs were poorly correlated. CONCLUSION: MRI with the addition of MAVRIC sequences could be a complementary tool for assessing symptomatic UKA and for quantifying appearances at the bone-component interface. This technique showed good reproducibility of analysis of the bone-component interface after cemented UKA. Future studies are necessary to define the bone-component interface of symptomatic and asymptomatic UKA patients.
