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Femoral anteversion Angle 

Femoral anteversion is defined by the angle of the femoral neck in relation to the femoral shaft in the coronal plane. Femoral rotational malalignment is associated with pain and functional disability, hip impingement and instability. Measurement of anteversion of the femoral neck is an important component of surgical planning, for femoral osteotomy in patients with cerebral palsy or developmental dysplasia of the hip and  total hip replacement surgery. In-toeing gait due to excessive femoral anteversion is common entity in outpatient children clinics.The in-toeining is usually resolved spontaneously but there are children after 8 years of age that the in-toeing fails to correct spontaneously and objective monitoring is important. Normal values according to patients age especially in clinical settings are hard to be remembered. Monitoring of Femoral Antetorsion is indicated especially in cases with torsional malalignment syndromes and cerebral palsy .

Femoral anteversion Angle logo app orthopractis
mac download Femoral anteversion Angle logo app orthopractis
mac download Femoral anteversion Angle logo app orthopractis

Numerous studies on the measurement of femoral torsion have been published with different method. The amount of anteversion of the hip usually is measured  with computed tomography (CT) scan. The modified Budin view (posteroanterior hip radiograph obtained in the sitting position with the patient facing the film in 90° flexion of the hip and knee with the hip abducted by 30° ) offers a way to measure anteversion by simple x ray without the use of CT and thus reducing radiation exposure and patient cost.
      The App is medical software aimed for orthopaedic surgeons, providing tools that allow doctors to:
-Securely import medical images directly from the camera or stored photos.
-By marking few points at the image of X-ray, the App calculates and offers a very convenient way to determine the most accurate possibly way at once.
-Save the planned images, for later review or consultation.The measured values are compared by normal reference databases according to age of the patient and help decide what are pathologic or normal.
- data are exported as txt file, ready to print or to input as cells to excel for research or monitor  accurately the angle in serial x-rays 
-The app  allows choosing  points in x rays  in an in independent manner from order and also  can be used to measure the angles- irrelevant of the method- images from CT or from simple X-ray respectively.
    All information received from the software output must be clinically reviewed regarding its plausibility before patient treatment! The App is indicated for assisting healthcare professionals. Clinical judgment and experience are required to properly use the software.The software is not for primary image interpretation.
 In a busy everyday practice, the examiner have to draw lines in X-rays or in clinical settings, this it is time consuming and cumbersome. Accessory instruments like protractors, hinged goniometers, well sharped pencils, rulers or even transparent papers must be available. The app offers a very convenient and accurate way to perform most common radiographic measurements  in a blink of an eye in front of your screen. The build in feature of the app, allows results to be categorized ( increased anterversion, excessive anteversion, decreased anteversion, or retroversion) according  patient’s age by comparing the data with normal reference database, this feature may help decide what could be considered normal or pathologic.
    The app is not a simple goniometer, is an enhanced product which helps to monitor objectively the course of the treatment and evaluate optimally the hip. This App is particular useful in clinical settings where you need a quick results without losing time. Please see tutorial videos at the developer’s web site


1.Boissonneault AR, Hiranaka T, Roberson J, Bradbury TL. A Validated Single-View Radiographic Alternative to Computed Tomography for the Measurement of Femoral Anteversion: A Method-Comparison Study.
J Arthroplasty. 2017 Mar;32(3):1018-1023.
2.Lee YK, Kim TY, Ha YC, Kang BJ, Koo KH..Radiological measurement of femoral stem version using a modified Budin method.
 Bone Joint J 2013 Jul;95-B(7):877-80.
3.Woerner ML1, Weber M1, Craiovan BS1, Springorum HR1, Grifka J1, Renkawitz TF1Radiographic Assessment of Femoral Stem Torsion in Total Hip Arthroplasty-A Comparison of a Caput-Collum-Diaphyseal Angle-Based Technique With the Budin View.J Arthroplasty. 2016 May;31(5):1117-22..
4.CRANE L. Femoral torsion and its relation to toeing-in and toeing-out.
J Bone Joint Surg Am. 1959 Apr;41-A(3):421-8.
5. Fabry G, MacEwen GD, Shands AR Jr.Torsion of the femur. A follow-up study in normal and abnormal conditions. J Bone Joint Surg Am. 1973 Dec;55(8):1726-38.

Femoral anteversion Angle logo app orthopractis
download Femoral anteversion Angle logo app orthopractis
mac download Femoral anteversion Angle logo app orthopractis

How to measure the Femoral Anteversion Angle (FAA) with the App. 

The app offers a very convenient way to determine the most accurate possibly lines in order to measure the angle. Once you load or capture an image and insert the age of the patient, the transparent circular template appears. First you aim to locate the center of the femoral head by moving the template over the femoral head, trying to fit to a best-fit circle to the contour of femoral head circumference. By clicking the “point” button, the center of the femoral head is marked (C1). To determine the second point P2 again you use the circular template of transparent cycles and you try to fit the best of circles to the two distant sites of the canal of the neck of the femur. By pressing the “point” button, automatically the centre of the canal is located (P2). The selected two points are joined, and the resulting straight line P1P2 forms the femoral neck axis. 

By repeating the same task you identify the third point (P3) and further distant you choose the fourth point (P4). The second line is drawn P3 P4 and the angle (A) between lines P1P2 and P3P4 is calculated, and appears in degrees in the screen. By inputing the age of the patient in the App, the measured angle is compared with values from normal reference database according to the patient age. The measured angle A is categorized according the following:  If A < +-1SD (Standard Deviation)  then anterversion is normal, if A > +1SD then anterversion is increased, if  A> +2SD, then anterversion is excessive, if A<-1SD, then anterversion is retroversion. This feature is it particular uselfull especially in clinical settings where you need a quick result without losing time in looking for reference data according to age variation in huge textbooks. 

mac download Femoral anteversion Angle logo app orthopractis
macmac download Femoral anteversion Angle logo app orthopractis
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