Browsing by Author "Burger, Marilize"

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    Defining the anatomic axis joint center distance and anatomic axis joint center ratio of the distal femur in the coronal plane
    (Wolters Kluwer - Medknow, 2020-12) Ferreira, Nando; Cornelissen, Andries Johannes; Burger, Marilize; Saini, Aaron Kumar
    Background: The aim of this radiographic study was to define the anatomic axis joint center distance (aJCD) and anatomic axis joint center ratio (aJCR) of the distal femur in the coronal plane for skeletally mature individuals. Methods: A cross‑sectional radiographic study was conducted to calculate the horizontal distances between the anatomical axis and the center of the knee at the level of the intercondylar notch and the joint line. Ratios relating these points to the width of the femur were then calculated. Results: A total of 164 radiographs were included: 91 male (55.5%) and 73 female patients (44.5%) with a mean age of 44.9 ± 18.1 years, with 79 right (48.2%) and 85 left (51.8%). The mean intercondylar width was 75.6 ± 6.6 mm, the mean aJCD at the notch was 3.6 ± 1.8 mm, the mean aJCD at the joint line was 4.9 ± 1.8 mm, the mean aJCR at the notch was 45.2 ± 2.4, and the mean aJCR at the joint line was 43.5 ± 2.4. The intercondylar width was significantly different (P < 0.001) between males (79.5 ± 4.8 mm) and females (70.6 ± 5.0 mm). A significant difference between the aJCR at the notch (P = 0.004) and the aJCR at the joint line (P = 0.003) was observed in males and females. No differences between the aJCD at the notch and/or aJCD at the joint line were observed between males versus females, left versus right, and those younger versus those older than 65 years. Conclusion: This is the first objective description of the aJCR of the distal femur in the coronal plane. This ratio can be used to aid the planning and execution of distal femoral deformity correction, retrograde femoral nailing, and total knee arthroplasty. Level of Evidence: IV
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    Quantitative fit analysis of acromion fracture plating systems using three-dimensional reconstructed scapula fractures – a multi-observer study
    (EDP Sciences, 2021) Charilaou, Johan; Dey, Roopam; Burger, Marilize; Sivarasu, Sudesh; Van Staden, Ruan; Roche, Stephen
    Introduction: Surgical treatment of displaced acromial and scapula spine fractures may be challenging due to the bony anatomy and variable fracture patterns. This difficulty is accentuated by the limitations of the available scapular plates for fracture fixation. This study compares the quantitative fitting of anatomic scapular plates and clavicle plates, using three-dimensional (3D) printed fractured scapulae. Methods: Fourteen scapulae with acromion and spine fractures were used for this study. Computerized tomographic (CT) scans of the fractured scapulae were obtained from the Philips picture archiving and communication system (PACS) database of patients admitted to a tertiary teaching hospital in Cape Town, South Africa between 2012 and 2016. The reconstructed scapulae were 3D printed and the anatomical acromion and clavicle plates were templated about the fracture regions. The fit assessment was performed by five observers who classified the plates as no-fit, intermediate fit, and anatomical fit according to the surgical guidelines. Results: The 6-hole anterior clavicle plate performed better than any of the scapular plates as they were able to fit 45.7% of the fractured acromion, including the spine. Among the pre-contoured anatomical scapula plates, both the short and the long acromion plates could fit only 27.3% of the fractured acromion. The intraclass correlation coefficient was 0.965 suggesting excellent consensus among the five observers. Conclusion: Clavicle plates were found to be better suited to fit around a scapula fracture in its acromion and spine region.