Browsing by Author "Karaman, Muhammed Ilkay"

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    Association between sagittal alignment and loads at the adjacent segment in the fused spine: a combined clinical and musculoskeletal modeling study of 205 patients with adult spinal deformity
    (SPRINGER, 2022-01-01) Ignasiak, Dominika; Behm, Pascal; Mannion, Anne F.; Galbusera, Fabio; Kleinstuck, Frank; Fekete, Tamas F.; Haschtmann, Daniel; Jeszenszky, Dezso; Zimmermann, Laura; Richner-Wunderlin, Sarah; Vila-Casademunt, Alba; Pellise, Ferran; Obeid, Ibrahim; Pizones, Javier; Sanchez Perez-Grueso, Francisco J.; Karaman, Muhammed Ilkay; Alanay, Ahmet; Yilgor, Caglar; Ferguson, Stephen J.; Loibl, Markus
    PurposeSagittal malalignment is a risk factor for mechanical complications after surgery for adult spinal deformity (ASD). Spinal loads, modulated by sagittal alignment, may explain this relationship. The aims of this study were to investigate the relationships between: (1) postoperative changes in loads at the proximal segment and realignment, and (2) absolute postoperative loads and postoperative alignment measures. MethodsA previously validated musculoskeletal model of the whole spine was applied to study a clinical sample of 205 patients with ASD. Based on clinical and radiographic data, pre-and postoperative patient-specific alignments were simulated to predict loads at the proximal segment adjacent to the spinal fusion. ResultsWeak-to-moderate associations were found between pre-to-postop changes in lumbar lordosis, LL (r = - 0.23, r = - 0.43
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    Perpendicular drill bit alignment provides a practical guidance to determine the appropriate suture anchor insertion angle during acetabular labral repair
    (OXFORD UNIV PRESS, 2022-01-01) Ismailoglu, Abdul Veli; Ozdogmus, Omer; Karaman, Muhammed Ilkay; Kayaalp, Asim; Kocaoglu, Baris
    The safe acetabular rim angle is an anatomical measurement used to determine the safety margin when inserting suture anchors. The purpose of the present study was to find out whether aligning the drill bit perpendicularly during arthroscopic surgery can provide a reference point for determining an appropriate angle to facilitate the suture anchor insertion and to prevent extra- and intra-articular perforations. One hundred computed tomographic hips were used to reconstruct three-dimensional acetabular hip models. Each model was radially sectioned at the 4 o'clock, 3 o'clock and anterior inferior iliac spine (AIIS) positions (that corresponded mainly to the 2:20 clock position). A perpendicular reference line, representing a perpendicular drill bit alignment, was drawn for each position within the acetabular model, and its relation to the safe acetabular rim angle was measured. The length of the perpendicular reference line and the effect of gender on measurements were also evaluated. The mean safe acetabular rim angle at the 3 o'clock position was significantly smaller compared to other clock positions (P < 0.001). The perpendicular reference line was located out of the safe acetabular rim angle in 28 cases (\%28), mostly in female acetabula at the 3 o'clock position, and relative to the perpendicular reference line the required minimal angle was 4 degrees +/- 2.3 degrees to place the anchor in the safe acetabular rim angle to avoid extra-articular perforation. The perpendicular reference line was shortest at the 3 o'clock position, and its mean length was shorter in female acetabula at all clock positions (P < 0.001). Aligning the drill bit perpendicular to the acetabular opening plane during an arthroscopic anchor placement is a practical way to estimate and target the position of the safe acetabular rim angle to avoid anchor perforations. Based on measurements from a perpendicularly aligned drill bit, the drill bit should be directed towards the joint minimally by 4 degrees to avoid extra-articular perforations and maximally by 30 degrees to avoid intra-articular perforations.