A 45-degree radiographic method for measuring the neck shaft angle and anteversion of the femur

a pilot study.

Pock Chin Teo, Abdul Yazid Mohd Kassim, K. Thevarajan

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

To propose a novel method to measure the neck shaft angle and anteversion of the femur using anteroposterior and 45-degree oblique radiographs. Three human subjects were used to verify the 45-degree oblique method. The true neck shaft angle and anteversion of the femur were determined using computed tomography. The true values were compared with the values derived by the 45-degree oblique method after correcting the distortion using a formula. With the true values based on computed tomography as references, the neck shaft angle and anteversion of the 3 subjects deviated +0.82 to +4.66 degrees and -2.14 to +2.55 degrees in lateral 45-degree oblique radiographs, respectively, whereas the corresponding values in medial 45-degree oblique radiographs were +0.98 to +5.93 degrees and -10.09 to +1.58 degrees. The lateral 45-degree oblique method resulted in smaller range of deviation and were more accurate. This 45-degree oblique method is useful in surgical planning, especially for femoral derotational osteotomy in children. This new method enables easy calculation of the true neck shaft angle and anteversion, with low radiation exposure.

Original languageEnglish
Pages (from-to)340-346
Number of pages7
JournalJournal of orthopaedic surgery (Hong Kong)
Volume21
Issue number3
Publication statusPublished - Dec 2013

Fingerprint

Femur
Neck
Tomography
Osteotomy
Thigh

ASJC Scopus subject areas

  • Surgery

Cite this

A 45-degree radiographic method for measuring the neck shaft angle and anteversion of the femur : a pilot study. / Teo, Pock Chin; Mohd Kassim, Abdul Yazid; Thevarajan, K.

In: Journal of orthopaedic surgery (Hong Kong), Vol. 21, No. 3, 12.2013, p. 340-346.

Research output: Contribution to journalArticle

@article{f8a98e32a520455a8f2f8c4da4f83fa3,
title = "A 45-degree radiographic method for measuring the neck shaft angle and anteversion of the femur: a pilot study.",
abstract = "To propose a novel method to measure the neck shaft angle and anteversion of the femur using anteroposterior and 45-degree oblique radiographs. Three human subjects were used to verify the 45-degree oblique method. The true neck shaft angle and anteversion of the femur were determined using computed tomography. The true values were compared with the values derived by the 45-degree oblique method after correcting the distortion using a formula. With the true values based on computed tomography as references, the neck shaft angle and anteversion of the 3 subjects deviated +0.82 to +4.66 degrees and -2.14 to +2.55 degrees in lateral 45-degree oblique radiographs, respectively, whereas the corresponding values in medial 45-degree oblique radiographs were +0.98 to +5.93 degrees and -10.09 to +1.58 degrees. The lateral 45-degree oblique method resulted in smaller range of deviation and were more accurate. This 45-degree oblique method is useful in surgical planning, especially for femoral derotational osteotomy in children. This new method enables easy calculation of the true neck shaft angle and anteversion, with low radiation exposure.",
author = "Teo, {Pock Chin} and {Mohd Kassim}, {Abdul Yazid} and K. Thevarajan",
year = "2013",
month = "12",
language = "English",
volume = "21",
pages = "340--346",
journal = "Journal of orthopaedic surgery (Hong Kong)",
issn = "1022-5536",
publisher = "Hong Kong Academy of Medicine Press",
number = "3",

}

TY - JOUR

T1 - A 45-degree radiographic method for measuring the neck shaft angle and anteversion of the femur

T2 - a pilot study.

AU - Teo, Pock Chin

AU - Mohd Kassim, Abdul Yazid

AU - Thevarajan, K.

PY - 2013/12

Y1 - 2013/12

N2 - To propose a novel method to measure the neck shaft angle and anteversion of the femur using anteroposterior and 45-degree oblique radiographs. Three human subjects were used to verify the 45-degree oblique method. The true neck shaft angle and anteversion of the femur were determined using computed tomography. The true values were compared with the values derived by the 45-degree oblique method after correcting the distortion using a formula. With the true values based on computed tomography as references, the neck shaft angle and anteversion of the 3 subjects deviated +0.82 to +4.66 degrees and -2.14 to +2.55 degrees in lateral 45-degree oblique radiographs, respectively, whereas the corresponding values in medial 45-degree oblique radiographs were +0.98 to +5.93 degrees and -10.09 to +1.58 degrees. The lateral 45-degree oblique method resulted in smaller range of deviation and were more accurate. This 45-degree oblique method is useful in surgical planning, especially for femoral derotational osteotomy in children. This new method enables easy calculation of the true neck shaft angle and anteversion, with low radiation exposure.

AB - To propose a novel method to measure the neck shaft angle and anteversion of the femur using anteroposterior and 45-degree oblique radiographs. Three human subjects were used to verify the 45-degree oblique method. The true neck shaft angle and anteversion of the femur were determined using computed tomography. The true values were compared with the values derived by the 45-degree oblique method after correcting the distortion using a formula. With the true values based on computed tomography as references, the neck shaft angle and anteversion of the 3 subjects deviated +0.82 to +4.66 degrees and -2.14 to +2.55 degrees in lateral 45-degree oblique radiographs, respectively, whereas the corresponding values in medial 45-degree oblique radiographs were +0.98 to +5.93 degrees and -10.09 to +1.58 degrees. The lateral 45-degree oblique method resulted in smaller range of deviation and were more accurate. This 45-degree oblique method is useful in surgical planning, especially for femoral derotational osteotomy in children. This new method enables easy calculation of the true neck shaft angle and anteversion, with low radiation exposure.

UR - http://www.scopus.com/inward/record.url?scp=84907018325&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84907018325&partnerID=8YFLogxK

M3 - Article

VL - 21

SP - 340

EP - 346

JO - Journal of orthopaedic surgery (Hong Kong)

JF - Journal of orthopaedic surgery (Hong Kong)

SN - 1022-5536

IS - 3

ER -