Multiplier HD vs AcetabularAnteversionApp

-The Multiplier App automates calculations to predict mature height and bone length in children. This method was created originally in Baltimore at the University of Maryland, and subsequently developed at the International Center for Limb Lengthening (ICLL), Rubin Institute for Advanced Orthopedics (RIAO), Sinai Hospital of Baltimore. -We have taught the Multiplier Method for more than 19 years at our annual Baltimore Limb Deformity Course (www.DeformityCourse.com). These calculations are typically performed by hand, using various formulae. Certain calculations are easy, but others involve more complicated formulae. Utilizing this app will reduce the time needed for these routine calculations and decrease errors. You need only input certain data (sex, age, length) and the app will calculate the answer by using the appropriate Multiplier formula. The Multiplier App will allow you to make the following calculations: • Lower Extremity - Limb Length Discrepancy (LLD) (Congenital) - LLD (Developmental) - Growth Remaining - Bone Length - Timing of Angular Correction - Timing of Epiphysiodesis - Comprehensive (Congenital) LLD and Epiphysiodesis -Scanogram Calculations (calculates femur/tibia lengths, overall limb length discrepancy, and amount/side of femur/tibia discrepancies) • Upper Extremity - LLD (Congenital) - LLD (Developmental) - Growth Remaining - Bone Length • Height and CDC Growth Charts (calculates height at maturity, calculates height at every age, and plots the patient’s height and weight on the CDC growth charts) • Achondroplasia - Height - Sitting Height - Leg Length • Fetus (calculates the length of tibia or femur at birth and maturity) • Foot - Foot Length - Foot Length Discrepancy • Spine (calculates sitting height at maturity) • Oblique Plane Deformity (calculates magnitude, orientation, and direction of an oblique plane deformity) • Inclined Osteotomy (calculates the rotational orientation and the vertical inclination of the osteotomy) This app also provides the following additional resources: -Bone Age: Elbow and Hand (shows how to determine skeletal age by using radiographs of the elbow or hand) -Figures that show the standard measurements for the lower limb and foot -The multiplier formulae that the app uses to perform the calculations -Tables that show the multiplier values that are used in the formulae -Figures that show the Solomin Foot Analysis (deformity correction planning for the midfoot, hindfoot, and ankle using reference lines and angles provided by Dr. Leonid Solomin) -Figures that show the development of the apophyses, epiphyses, and bones -Bibliography -User guide Disclaimer: No growth prediction method is 100% accurate; this App is not a substitute for sound and careful clinical judgment. Privacy Policy: We respect the privacy of the people who use International Center for Limb Lengthening apps. The Multiplier app does not collect, use or distribute any data from the users.

Acetabular version refers to the anteroposterior orientation of the acetabular opening relative to the true horizontal axis of the pelvis. The normal human acetabulum is anteverted in order to allow impingement free range of motion including flexion, adduction, and internal rotation. Abnormal acetabular version has been correlated with pathologic hip conditions including femoroacetabular impingement (FAI) and developmental hip dysplasia.The association between acetabular version and hip pain has been well established in recent years as a source of contributing to early hip osteoarthrosis and labral tears. Recognition and appropriate treatment of abnormal acetabular version is crucial to preventing irreversible damage to the hip Acetabular version is conventionally evaluated on CT scans but excessive radiation doses associated with routine use of computed tomography (CT). An objective radiographic tool which provides measurements comparable in accuracy to CT measurements has been developed by Dr. Hefti (Nomogram).Tedious and time-consuming calculation has to be done in simple X-rays in order to calculate the acetabular anteversion. The primary goal of this App is to help determine radiographic values of acetabular anteversion in a practice in a blink of an eye and avoiding CT scans. 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 certain points in a simple standard AP pelvic radiograph, geometric parameters are being calculated. The App computes the acetabular anteversion based on a pelvic AP radiograph. The angle of anteversion is calculated through the formula according to Heftis nomogram. The acetabular orientation (anteversion/retroversion) is determine by the app by the measurement of the angles between the center of the femoral head and the anterior (φ) and posterior (φ’) acetabular rim. Once you choose correctly the anterior and posterior acetabular rims the app calculates the acetabular anteversion based on nomogram. -The data are printed over to screen so each case can easily assessed -Save the planned images, for later review or consultation. Disclaimer. Regarding its plausibility app offers no diagnosis or treatment. App provide an early indication that further evaluation may be warranted by Speciality Doctor. Explicitly is announced that the apps are not for diagnosis. Clinical judgment and experience are required to properly use the software. App alone do not replace an M.D. or specialist. All information received from the App output must be reviewed before any attempted treatment. The software is not for primary image interpretation. Any influence to the operators in making decisions remains user own responsibility and experience. App does not dispense medical advice. Patient should seek a doctor’s advice in addition using the app and /or before making any medical decisions for themself. Never substitute or replace doctors advice or change treatment modalities based on any measured outcome. App indicated for assisting healthcare professionals for scientific and research reason. Clinical judgment and experience are required to properly use the app and further research and validation is pending in coming future. Reference Friz Hefti, Pediatric Orthopaedics in Practice, Chapter5 , Pelvis hips and thighs 5.3.2.1 Biomechanics of the hip-Book. Springer