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Article

Impact of Wedge Effect on Outcomes of Intertrochanteric Fractures Treated with Intramedullary Proximal Femoral Nail

1
Department of Orthopedics, Kaohsiung Medical University Hospital, Kaohsiung Medical University, Kaohsiung 80708, Taiwan
2
Department of Orthopedics, School of Medicine, College of Medicine, Kaohsiung Medical University, Kaohsiung 80708, Taiwan
3
Orthopaedic Research Center, Kaohsiung Medical University, Kaohsiung 80708, Taiwan
4
Regeneration Medicine and Cell Therapy Research Center, Kaohsiung Medical University, Kaohsiung 80708, Taiwan
5
Department of Orthopedics, Kaohsiung Municipal Siaogang Hospital, Kaohsiung Medical University, Kaohsiung 80708, Taiwan
6
Department of Orthopedics, Kaohsiung Municipal Ta-Tung Hospital, Kaohsiung 80708, Taiwan
7
Department of Public Health and Environmental Medicine, School of Medicine, College of Medicine, Kaohsiung Medical University, Kaohsiung 80708, Taiwan
*
Author to whom correspondence should be addressed.
J. Clin. Med. 2021, 10(21), 5112; https://doi.org/10.3390/jcm10215112
Submission received: 19 August 2021 / Revised: 19 October 2021 / Accepted: 26 October 2021 / Published: 30 October 2021
(This article belongs to the Section Orthopedics)

Abstract

The purpose of this study is to investigate the risk factors for wedge effect and its relevance between blade cut-out in patients with intertrochanteric fractures (ITF) treated with proximal femoral nail antirotation II (PFNA-II). A total of 113 patients with ITF treated with PFNA-II between 2012 and 2016 were retrospectively analyzed. Radiographic variables including preoperative fracture pattern, fracture classification, lateral wall fracture, and postoperative neck–shaft angle (NSA), femoral offset (FO), blade cut-out, and Parker’s ratio were measured for analysis. An average of 4.16° of varus malalignment in NSA and 5.5 mm of femoral shaft lateralization in FO was found post-operatively. The presence of lateral wall fracture was significantly related to post-operative varus change of NSA (p < 0.05). After at least one year of follow up, the blade cut-out rate was 2.65% (3/113), and Parker’s ratio was significantly higher in patients with blade cut-out (p = 0.0118). This study concluded that patients with ITF-present preoperative lateral wall fracture and postoperative higher Parker’s ratio in AP radiography showed higher incidence of wedge effect that might increase risk of blade cut out.
Keywords: cut-out; femoral offset; intertrochanteric fracture; neck-shaft angle; wedge effect cut-out; femoral offset; intertrochanteric fracture; neck-shaft angle; wedge effect

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MDPI and ACS Style

Yen, S.-H.; Lu, C.-C.; Ho, C.-J.; Huang, H.-T.; Tu, H.-P.; Chang, J.-K.; Chen, C.-H.; Lin, S.-Y. Impact of Wedge Effect on Outcomes of Intertrochanteric Fractures Treated with Intramedullary Proximal Femoral Nail. J. Clin. Med. 2021, 10, 5112. https://doi.org/10.3390/jcm10215112

AMA Style

Yen S-H, Lu C-C, Ho C-J, Huang H-T, Tu H-P, Chang J-K, Chen C-H, Lin S-Y. Impact of Wedge Effect on Outcomes of Intertrochanteric Fractures Treated with Intramedullary Proximal Femoral Nail. Journal of Clinical Medicine. 2021; 10(21):5112. https://doi.org/10.3390/jcm10215112

Chicago/Turabian Style

Yen, Shen-Ho, Cheng-Chang Lu, Cheng-Jung Ho, Hsuan-Ti Huang, Hung-Pin Tu, Je-Ken Chang, Chung-Hwan Chen, and Sung-Yen Lin. 2021. "Impact of Wedge Effect on Outcomes of Intertrochanteric Fractures Treated with Intramedullary Proximal Femoral Nail" Journal of Clinical Medicine 10, no. 21: 5112. https://doi.org/10.3390/jcm10215112

APA Style

Yen, S.-H., Lu, C.-C., Ho, C.-J., Huang, H.-T., Tu, H.-P., Chang, J.-K., Chen, C.-H., & Lin, S.-Y. (2021). Impact of Wedge Effect on Outcomes of Intertrochanteric Fractures Treated with Intramedullary Proximal Femoral Nail. Journal of Clinical Medicine, 10(21), 5112. https://doi.org/10.3390/jcm10215112

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