Introduction Hemihamate arthroplasty (HHA) method is one of the recommended treatment methods for unstable proximal interphalangeal joint (PIPJ) fracture dislocations The primary goal of this method is to achieve a stable and well-aligned joint by reconstructing the palmar lip. The aim of this study is to present mid to long term results of patients treated with HHA method in the acute, subacute and chronically. Materials and methods 22 patients was operated with this technique by single surgeon between 2013 and 2025. Patients were classified as acute (< 3 weeks), subacute (3–6 weeks), and chronic (> 6 weeks) based on the time elapsed between the date of injury and the date of surgery. Patients were assessed clinically, radiologically and subjectively. Results The mean ROM of the PIPJ was 80.6° (20–100°), the flexion was 91.6° (65–100), and the extension lag was 11° (0–50). Grip strength on the operated side was 91.7% of the average on the unaffected side (74–110). The mean rest pain score according to the VAS (0 least-10 most) was 0.6 (0–3), and the activity pain score was 2 (0–5). The mean Q-DASH scores assessing functional level were 9.55 and the mean Mayo scores were 81.4. When patients were asked about their satisfaction after surgery, 12 patients responded very good, two patients good, and four patients moderate. Conclusions With HHA, reasonable PIPJ ROM and good functional outcomes were achieved. With increased PIP ROM, functional outcomes statistically significantly improved. Thanks to hemihamate arthroplasty, successful results can be achieved even in cases where almost the entire joint surface is affected. Hemihamate arthroplasty method provides good functional results even in chronic injuries lasting up to a year, as in acute injuries. Level of evidence IV.

Objective: Femoral derotational osteotomy is a surgical intervention that involves the derotation of the femur at certain sites to achieve the desired femoral anteversion angle. However, current intraoperative techniques measuring the degree of correction and adequately performing it is still insufficient to achieve the desired femoral anteversion angle. The aim of this study is to investigate whether the geometric arc and chord formulas are applicable to achieve the target femoral anteversion angle in mid-shaft femoral derotational osteotomy. Methods: CT images of 20 femurs with excessive anteversion or retroversion deformities were retrospectively selected, and three-dimensional (3D) geometric models were obtained. 15⁰ of femoral anteversion were chosen as the target angle. Geometric arc and chord formulas were separately applied on axial CT images at the mid-point of the femurs to calculate the degree of correction. Then, virtual mid-shaft femoral derotational osteotomy was performed, then post-op femoral anteversion angle was measured. Results: There was no statistical difference between the postoperative measured anteversion angles and the targeted angle in all examples. The arc and the chord lengths were not statistically different which indicates both formulas can be used to estimate the degree of correction. Conclusion: The arc and chord formulas provided an accurate target femoral anteversion angle. Using one of these formulas preoperatively can facilitate to achieve desired femoral anteversion angle without having the intraoperative measurements nor using any special equipment.

Background/Objectives: Lisfranc joint injuries are complex midfoot pathologies frequently associated with subtle radiologic findings and delayed diagnosis. Although ligamentous disruption is considered the primary mechanism, the contribution of intrinsic osseous morphology remains insufficiently investigated. Previous studies have primarily relied on two-dimensional measurements and limited morphometric parameters. Therefore, this study aimed to provide a comprehensive three-dimensional (3D) computed tomography (CT) based morphometric evaluation of the medial and central columns of the Lisfranc joint and to determine whether specific bony parameters are associated with injury predisposition. Methods: A total of 48 CT scans, including 23 from patients with Lisfranc joint injuries and 25 from healthy controls without midfoot trauma, were retrospectively analyzed. For both groups, 3D models of the first three metatarsals (M1–M3) and cuneiforms (C1–C3) were reconstructed to measure bone length, articular surface areas, volumes, M1–M2/M2–M3 depth differences, and dorsal step-off (dorsal subluxation of M2 relative to C2). Correlations of these measurements with M2 length were additionally assessed in each group. Results: Comparisons between injury and healthy control groups revealed no significant differences in bony morphometrics (p > 0.05). Correlation analysis showed that a longer M2 were associated with greater cuneiform volumes and larger metatarsal articular surface areas (p < 0.05). Conclusions: This comprehensive 3D morphometric assessment of the Lisfranc joint indicates that intrinsic bony anatomy alone is unlikely to represent a primary predisposing factor for Lisfranc injuries. The observed positive relationship between M2 length and cuneiform articular surface areas and volumes demonstrates structural interdependence within the medial and central columns. Overall, injury susceptibility does not appear to be explained by variations in osseous morphology alone.

Background/Objectives: Severe extravasation injuries require prompt, agent-specific intervention to prevent avoidable tissue loss, yet they are often first assessed by surgeons with no structured training in their management. This study aimed to identify knowledge gaps in evidence-based extravasation management and to determine whether seniority, formal training or institutional factors are associated with a higher knowledge score. Methods: A cross-sectional web-based survey was conducted in June 2026 among orthopedic and plastic surgeons in Türkiye. In total, 359 eligible physicians responded to a 17-item knowledge instrument covering definitions, severity grading, treatment decisions and risk factors, alongside items on demographics, training and institutional infrastructure. Scores were dichotomized at 70% correct to define a high knowledge level, and logistic regression identified independent predictors. Results: The mean knowledge score was 10.0 ± 3.5 of 17 (KR-20 = 0.795), and 127 of 359 participants (35.4%) reached the high-knowledge threshold. Deficiencies were not uniformly distributed: accuracy was high for basic definitional items (76–90%) but markedly lower for time-sensitive therapeutic decisions, including antidote selection and flush-technique indications (51–59%), and for recognition of high-risk agents (24.0%). No independent association was detected between knowledge level and professional seniority, formal training or institution type. More frequent case exposure was associated with a higher mean score in unadjusted analysis (p = 0.017) but was not retained after adjustment. Conclusions: Substantial knowledge gaps were identified across surgical specialties, concentrated in the time-sensitive decisions in which errors may contribute to preventable tissue loss. No independent association was detected between knowledge level and either seniority or formal training; experiential learning alone may therefore not ensure familiarity with current evidence-based management. Standardized cross-specialty education and institutional protocols are needed.