Journal of Musculoskeletal Trauma

Three-Dimensional Analysis of the Morphological Features in the Femur of Atypical Fracture and Practical Implications of Intramedullary Nailing: Yong Uk Kwon, Kyung-Jae Lee, Joo Young Choi, Gu-Hee Jung; J Korean Fract Soc 2020;33(2):87-95. Published online April 30, 2020; DOI: https://doi.org/10.12671/jkfs.2020.33.2.87

Abstract PDF: Purpose
This study analyzed the morphological features of the contralateral femur without an atypical fracture by constructing a three-dimensional model with an actual size medullary canal.
Materials and Methods
Lateral and anterior bowing of the shaft were measured for 21 models, and the shape of the medullary canal was analyzed. To eliminate the projection error, the anteroposterior (AP) femur was rotated internally to the extent that the centerline of the head and neck, which is the ideal position of cephalomedullary nail screw, was neutral, and the lateral femur matched the medial and lateral condyle exactly.
Results
The lateral bowing and anterior bowing was an average of 5.5° (range, 2.8°-10.7°; standard deviation [SD], 2.4°) and 13.1° (range, 6.2°-21.4°; SD, 3.2°), respectively. In the area where lateral bowing increased, the lateral cortex became thicker, and the medullary canal was straightened. On the lateral femur, the anterior angle was increased significantly, and the diameter of curvature averaged 1,370.2 mm (range, 896-1,996 mm; SD, 249.5 mm).
Conclusion
Even if the anterolateral bowing increases in the atypical femur, the medullary canal tends to be straightened in the AP direction. So, it might be considered as a reference to the modification of an intramedullary nail to increase the conformity.

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Ulnar Insufficiency Fractures in Patients on Prolonged Bisphosphonate Therapy: A Case Report: Kyu Min Kong, Yong Uk Kwon, Young Kyung Min, Doo Yeol Kim; J Korean Fract Soc 2019;32(3):143-147. Published online July 31, 2019; DOI: https://doi.org/10.12671/jkfs.2019.32.3.143

Atypical fractures associated with prolonged bisphosphonate (BP) therapy rarely occur outside the femur, and the diagnostic criteria, appropriate treatment principles, and fixation methods for atypical ulnar fractures have not been established. The authors experienced the use of internal fixation with a metal plate and a new internal fixation method with an intramedullary nail in the treatment of an atypical ulnar fracture in a patient who had been on BP therapy for 10 to 20 years. This paper reports findings along with a review of the relevant literature.

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Treatment of Atypical Ulnar Fracture Associated with Bisphosphonate Therapy: A Case Report
Dong-Soo Kim, Ji-Kang Park, Eui-Sung Choi, Ho-Seung Jeong, Seok-Hyun Hong, Byung-Hyun Ahn
Journal of the Korean Fracture Society.2020; 33(2): 101. CrossRef

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Radiologic and Serologic Factors Associated with Bone Union at Femoral Atypical Fracture: Suc Hyun Kweon, Byung Min Yoo; J Korean Fract Soc 2019;32(1):27-34. Published online January 31, 2019; DOI: https://doi.org/10.12671/jkfs.2019.32.1.27

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PURPOSE
The purpose of this study was to investigate the radiologic and serologic factors related to postoperative union using intramedullary (IM) internal fixation in atypical femoral fractures (AFF), which are closely related to bisphosphonates (BPs) for osteoporosis.
MATERIALS AND METHODS
From February 2008 to December 2016, 65 patients (71 cases) who had undergone IM nail fixation after diagnosis of AFF were enrolled in this study. Patients were divided into group A, who experienced union within 6 months and group B, who did not experience union within 6 months. They were evaluated for duration of BPs use, radiologic factors and serological factors.
RESULTS
The mean duration of BPs use was 6.17 years in group A and 8.24 years in group B (p=0.039). In the subtrochanteric area, there were 14 cases (27.5%) in group A and 14 cases (70.0%) in group B. In the femoral shaft, there were 37 cases (72.5%) in group A and 6 cases (30.0%) in group B (p=0.001). On the preoperative, the flexion in the coronal plane was 5.9Â° (2.1Â°â€“9.2Â°) in group A and 8.0Â° (3.1Â°â€“12.1Â°) in group B (p=0.041). On the postoperative, conversion to valgus was 15 cases (29.4%), 8 cases (40.0%); conversion to neutral was 34 cases (66.7%) and 8 cases (40.0%); conversion to varus was 2 cases (3.9%) and 4 cases (20.0%), each (p=0.037). The fracture site gap was 1.5 mm (0â€“2.9 mm) on the front side and 1.2 mm (0â€“2.2 mm) on lateral side and 2.2 mm (0.9â€“4.7 mm) and 1.9 mm (0.5â€“3.5 mm), each (p=0.042, p=0.049). Among serological factors, there was no significant difference between the two groups.
CONCLUSION
Factors adversely affecting the union should be recognized before surgery, such as longterm BPs use or a severe degree of bending of the femur in the coronal plane. During surgery, proper reduction and spacing of the fracture site on the coronal plane should allow adequate reduction of the anterior and posterior surfaces. Obtaining anatomic reduction would be most beneficial for union, but if that is not possible, obtaining congenital valgus rather than varus on the coronal plane may be helpful for union.

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Subtrochanteric Fracture Reduction during Intramedullary Nailing: Technical Note
Gyu Min Kong
Journal of the Korean Fracture Society.2019; 32(2): 107. CrossRef

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