CongruenceIndexApp 17+


    • $0.99


Transparent Moses templates, goniometers, protractors, well sharped pencils, are obsolete for measuring congruence of hip joint in X-Rays! This app is an enhanced product

Congruence is present when the center of the femoral head (ball) and that of the acetabulum (socket) coincide. Lack of hip congruence between the femoral head and the acetabulum leads to increased local contact stresses, degeneration and consequently to premature arthritis. Although corrective hip osteotomies for the realignment of the dysplastic acetabulum is the main goal of treatment strategies, if the joint space congruency remain fair this end up in failure. Joint congruency can be rated subjectively according to the surgeons experience but according to international literature, evaluation and monitoring hip joint congruency is crucial to judge and predict the outcome of treatment. The App measures objectively the congruence and gives values as percentage (Congruence Index) which can be used for evaluation or comparisons of treatments modalities like acetabular osteotomies in developmental dysplasia or Legg-Calve-Perthes disease of the hip.

The CongruenceIndexApp is medical software aimed for orthopaedic surgeons, providing tools that allow doctors to:
-Securely import medical images directly from the camera or stored photos
-Offers a very convenient and most accurate possibly way to determine joint space congruency with two methods. With transparent circular template-Moses template- you try to find the best-fitted circle superimposed over the femoral head, you mark the femoral head center and with the same manner you locate the acetabular center of the weight bearing zone. When the center of the best-fitted circle of the acetabulum coincide with the center of the femoral head, the concruency of the joint is considered normal (CnI =100%).The app calculates automatically the congruency index. The results are printed as a percentage of congruency of the hip joint and the hip is categorized as normal or abnormal.
-Save the planned images, for later review or consultation.
All information received from the software output must be clinically reviewed regarding its plausibility before patient treatment! Congruence Index App indicated for assisting healthcare professionals. The app does not provide medical diagnoses or treatment advice.

The software should be used only for educational purpose .Never use in real Surgery regarding its plausibility, validation is pending. Clinical judgment and experience are required to properly use the software. It only serves as a general guideline. All information received from the software output must be reviewed before any actual attempt .The App indicated for assisting during training. Judgment and experience are required to properly use the App. The software is not for primary image interpretation. Any influence to the operators in making decisions remains Surgeons own responsibility and experience. App does not dispense medical advice.

1. Hartig-Andreasen C, Troelsen A, Thillemann TM, Søballe K. What factors predict failure 4 to 12 years after periacetabular osteotomy? Clin Orthop Relat Res. 2012 Nov;470(11):2978-87
2. Okano K, Enomoto H, Osaki M, Shindo H. Joint congruency as an indication for rotational acetabular osteotomy. Clin Orthop Relat Res. 2009;467:894–900.
3. Matheney Travis, Kim Young-jo, Zurakowski David, Matero Catherine, BA; Millis Michael. Intermediate To Long-term Results Following The Bernese Periacetabular Osteotomy And Predictors Of Clinical Outcome.The Journal Of Bone & Joint Surgery - Scientific Articles: 01 September 2009 - Volume 91 - Issue 9 - p. 2113-2123
4.Murphy S, Deshmukh R. Periacetabular osteotomy: preoperative radiographic predictors of outcome. Clin Orthop Relat Res. 2002; 405:168–174.

App Privacy

The developer, ORTHOPRACTIS.COM SINGLE MEMBER P.C., indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy.

Data Not Collected

The developer does not collect any data from this app.

Privacy practices may vary, for example, based on the features you use or your age. Learn More


  • Family Sharing

    Up to six family members can use this app with Family Sharing enabled.

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