DOS 2018

DOS Kongressen 2018 · 223 Incidences and patient-, fracture- and operative characteristics of fractures of the knee, including the distal femur, patella and proximal tibia, in Denmark during 1996-2017: a nationwide cohort study. Veronique Vestergaard, Alma Pedersen B., Peter Toft Tengberg, Anders Troelsen, Henrik Schrøder Orthopaedic Surgery, Slagelse Sygehus; Clinical Department of Epidemiology, Aarhus UniversityHospital; Orthopaedic Surgery, HvidovreHospital; Orthopaedic Surgery, Hvidovre Hospital; Orthopaedic Surgery, Næstved Sygehus Background: Circa 2.000 knee fracture patients are registered in Denmark each year. Knee fractures often result in impaired mobility, pain, early retire- ment and secondary osteoarthritis. There are currently no large-scale studies on incidence rates (IRs) and descriptions of knee fracture characteristics. Purpose / Aim of Study: To calculate IRs and describe patient-, fracture- and operative characteristics of knee fractures during 1996-2017. Materials and Methods: A nationwide cohort study of prospectively collected data from Danish National Patient Registry included all patients with ICD-10 code S724, S820 and/or S821 for knee fracture, and a knee operation code. IRs for registered knee fracture operation codes were computed per 1000 person- years with 95% confidence intervals (CI). The study population was described by fracture type and operation type: external fixation, open reduction internal fixation (ORIF) and knee prosthesis, and the largest subgroup also by sex and age. Findings / Results: 31.294 knee fracture operation codes were registered, 22.355 were ORIFs, 4.650 were knee prostheses and 2.290 were external fixations. Proximal tibia fracture was the most frequently registered knee frac- ture type. Proximal tibia plating was the most frequent knee operation coded (n=5.316), mean patient age was 55.7 years and 60.4% were female. 2.815 distal femur fractures were plated. 5.121 patella fractures were wired. IR for registered knee fracture operation codes was 0.24 (95%CI 0.22-0.25) in 1996 increasing to 0.28 (95%CI 0.27-0.29) in 2017, corresponding to an increase of 18 %. Conclusions: The IR for registered knee fracture operation codes increased by 18 % in 22 years. ORIF is the most common knee operation. Proximal tibia frac- ture is the most common operated knee fracture type, is most frequently plated and middle-aged females are most likely at risk. 164.