Factors Affecting Posterior Angulation in Retrograde Intramedullary Nailing for Distal Femoral Fractures

Hohyoung Lee; Ji-Ho Jeong; Min-Su Kim; Bum-Soo Kim

doi:10.12671/jkfs.2018.31.2.50

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Lee, Jeong, Kim, and Kim: Factors Affecting Posterior Angulation in Retrograde Intramedullary Nailing for Distal Femoral Fractures

Original Article

J Korean Fract Soc 2018;31(2):50-56.

Published online: 10 April 2018

DOI: https://doi.org/10.12671/jkfs.2018.31.2.50

Factors Affecting Posterior Angulation in Retrograde Intramedullary Nailing for Distal Femoral Fractures

Hohyoung Lee, M.D., Ji-Ho Jeong, M.D., Min-Su Kim, M.D., Bum-Soo Kim, M.D.

Department of Orthopedic Surgery, Cheju Halla General Hospital, Jeju, Korea

Correspondence to: Ji-Ho Jeong, M.D. Department of Orthopedic Surgery, Cheju Halla General Hospital, 65 Doryeong-ro, Jeju 63127, Korea Tel: +82-64-740-5410 Fax: +82-64-743-3110 E-mail: jihojeong76@gmail.com

Received 4 November 2017 Revised 21 January 2018 Accepted 30 January 2018

This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/4.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Purpose

To analyze the factors that cause a posterior angulatory deformity in the retrograde intramedullary nailing of distal femoral fractures.

Materials and Methods

Fifty-five patients with distal femur fractures who were treated with retrograde intramedullary nailing were enrolled in this study. They were followed-up for at least one year postoperatively. The posterior angulatory deformity was evaluated according to the fracture location, pattern, and insertion point and the insertion point was compared with the ideal point derived from the radiographs of 100 normal adults. The correlation between the posterior angulation and the entry point of the nail was analyzed.

Results

The posterior angulation was similar in terms of the fracture location; a meaningful difference was noted among the fracture patterns (p=0.047). The posterior angulation was significantly greater when the entry point was located more posteriorly, accepting a malreduced state (p=0.012).

Conclusion

Posterior angulation was smaller in the transverse fracture and the posterior location of the entry point from the apex of the Blumensaat's line increased the posterior angulation.

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Keywords: Fracture, Distal femur, Retrograde intramedullary nailing

References

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Fig. 1.

Method of measuring the distance between the intramedullary center line and apex of the Blumensaat's line: (A) practical measurement, (B) schematic drawing.

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Fig. 2.

Entry point of the retrograde intramedullary nail, which could affect the posterior angulation of the fracture: (A) The 8.16 mm anterior location of entry point with no posterior angulation of fracture site was observed. (B) The 7.81 mm posterior location of entry point with posterior angulation.

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Fig. 3.

Method for measuring the posterior angulation of the fracture site: That could be measured from the angle between an intramedullary center line of the distal fragment and that of the proximal fragment. This patient had malunion of 12.6^o posterior angulation.

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Fig. 4.

Fracture level as a factor that could affect the posterior angulation of the fracture: (A) supracondylar level (AO 33 type), (B) distal one third level of femoral shaft (AO 32 type).

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Fig. 5.

Facture pattern as a factor that could affect the posterior angulation of a fracture: (A) transverse type, (B) oblique type, (C) spiral type, and (D) comminuted type.

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Table 1.

Posterior Angulation of a Distal Femoral Fracture according to the Fracture Level and Pattern

Factor	Posterior angulation (^o)	p-value
Fracture level		0.708*
Shaft (AO/ASIF 32 type)	2.6±4.1
Supracondylar or intercondylar fracture (AO/ASIF 33 type)	3.1±3.9
Fracture pattern		0.047^†
Transverse	1.1±2.1
Oblique	4.0±2.9
Spiral	4.7±4.9
Comminuted	5.5±6.8
Entry point		0.005*
Anterior	1.3±0.7
Non-anterior
Center	1.5±0.7
Posterior	9.5±1.4

Values are presented as mean±standard deviation. *p-value by independent samples t-test.

^† p-value by ANOVA.

Table 2.

Shortest Distance between Apex of the Blumensaat's Line and Intramedullary Center Line of One Hundred Normal Koreans

Variable	Age (yr)	The shortest distance (mm)
Male (50 cases)	60 (31–87)	7.4 (3–13)
Female (50 cases)	58 (33–82)	7.0 (4–11)
Total (100 cases)	59 (31–87)	7.2 (3–13)

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