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Effect of lengthening along the anatomical axis of the femur and its clinical impact

Emara, Khaled M; Mahmoud, Ahmed Nageeb LU ; Emara, Ahmed K and Emara, Mariam K (2017) In World journal of orthopedics 8(5). p.431-435
Abstract

AIM: To review and study the effect of lengthening along the anatomical axis of long bones and its relation to the mechanical axis deviation.

METHODS: We try in this review to calculate and discuss the exact clinical impact of lengthening along the anatomical axis of the femur on affecting the limb alignment. Also we used a trigonometric formula to predict the change of the femoral distal anatomical mechanical angle (AMA) after lengthening along the anatomical axis.

RESULTS: Lengthening along the anatomical axis of the femur by 10% of its original length results in reduction in the distal femoral AMA by 0.57 degrees. There is no objective experimental scientific data to prove that the Mechanical axis is passing via the... (More)

AIM: To review and study the effect of lengthening along the anatomical axis of long bones and its relation to the mechanical axis deviation.

METHODS: We try in this review to calculate and discuss the exact clinical impact of lengthening along the anatomical axis of the femur on affecting the limb alignment. Also we used a trigonometric formula to predict the change of the femoral distal anatomical mechanical angle (AMA) after lengthening along the anatomical axis.

RESULTS: Lengthening along the anatomical axis of the femur by 10% of its original length results in reduction in the distal femoral AMA by 0.57 degrees. There is no objective experimental scientific data to prove that the Mechanical axis is passing via the center of the hip to the center of the knee. There is wide variation in normal anatomical axis for different populations. In deformity correction, surgeons try to reproduce the normal usual bone shape to regain normal function, which is mainly anatomical axis.

CONCLUSION: Lengthening of the femur along its anatomical axis results in mild reduction of the distal femoral AMA. This may partially compensate for the expected mechanical axis lateralisation and hence justify its minimal clinical impact.

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author
publishing date
type
Contribution to journal
publication status
published
keywords
Journal Article
in
World journal of orthopedics
volume
8
issue
5
pages
5 pages
external identifiers
  • scopus:85019231451
ISSN
2218-5836
DOI
10.5312/wjo.v8.i5.431
language
English
LU publication?
no
id
9bcc76c8-debe-4e7c-a6b3-35daabb2bc6b
date added to LUP
2017-09-13 10:28:51
date last changed
2017-09-17 09:53:17
@article{9bcc76c8-debe-4e7c-a6b3-35daabb2bc6b,
  abstract     = {<p>AIM: To review and study the effect of lengthening along the anatomical axis of long bones and its relation to the mechanical axis deviation.</p><p>METHODS: We try in this review to calculate and discuss the exact clinical impact of lengthening along the anatomical axis of the femur on affecting the limb alignment. Also we used a trigonometric formula to predict the change of the femoral distal anatomical mechanical angle (AMA) after lengthening along the anatomical axis.</p><p>RESULTS: Lengthening along the anatomical axis of the femur by 10% of its original length results in reduction in the distal femoral AMA by 0.57 degrees. There is no objective experimental scientific data to prove that the Mechanical axis is passing via the center of the hip to the center of the knee. There is wide variation in normal anatomical axis for different populations. In deformity correction, surgeons try to reproduce the normal usual bone shape to regain normal function, which is mainly anatomical axis.</p><p>CONCLUSION: Lengthening of the femur along its anatomical axis results in mild reduction of the distal femoral AMA. This may partially compensate for the expected mechanical axis lateralisation and hence justify its minimal clinical impact.</p>},
  author       = {Emara, Khaled M and Mahmoud, Ahmed Nageeb and Emara, Ahmed K and Emara, Mariam K},
  issn         = {2218-5836},
  keyword      = {Journal Article},
  language     = {eng},
  number       = {5},
  pages        = {431--435},
  series       = {World journal of orthopedics},
  title        = {Effect of lengthening along the anatomical axis of the femur and its clinical impact},
  url          = {http://dx.doi.org/10.5312/wjo.v8.i5.431},
  volume       = {8},
  year         = {2017},
}