WhereMyCup App

Updated
How to measure with WhereMyCup App

App helps preoperatively to identify the complex “hip-spine” THA patient at high risk for instability, with minimal measurements in functional spinopelvic X-ray imaging.

Evaluation of functional spinopelvic imaging in lateral radiographs in sitting and standing positions is of importance, especially in patient before total hip replacement surgery. Patients with concomitant hip and spine pathology undergoing primary total hip  were identified as being at high risk for dislocation. Instability-prone patients arhtroplasty (THA) should appropriately assessed for the presence of deformity and abnormal spinopelvic mobility. The preoperative  planning for THA should encompass evaluation of functional spinopelvic imaging in lateral radiographs in sitting and standing positions. Before planning cup position the surgeon should taken into account also anterior pelvic plane (APP) the coronal (functional) plane and the anterior pelvic plane tilt APPt or pelvic tilt  and abnormal spinopelvic mechanics from standing to sitting.

The App is software aimed for orthopaedic surgeons, and allow to:

-securely import medical images directly from the camera or stored photos.

- mark certain points at the image of X-ray, and calculate at once the anterior pelvic plane tilt (APPt) or pelvic tilt , Pelvic incidence (PI), Sacral slope (SS), Lumbar lordosis (LL), Pelvic incidence Angle (PI) minus Lumbar lordosis Angle (LL)(PI–LL).

-to classify the patient into one of Four Categories of the Hip-Spine Classification (1A,1B,2A,2B) by integrating spinal alignment (spinal deformity defined at PI-LL mismatch >10 -Flatback deformity  and mobility (stiffness- Defined as no change in Sacral Slope -SS between standing and sitting positions -ΔSS<10 deg ) </p>

-cases are categorised to group-specific recommendations for acetabular cup position respectively thus with minimal measurements will effectively identify the complex “hip-spine” THA patient at high risk for postoperative instability (1).

-save the planned images, for later review or consultation.The measured values are exported as txt file, ready to print or to input as cells to excel for research.

-in case of wrong selection powerful undo feature is present.

-According to measured parameters in standing and sitting lateral x- rays - based n a busy everyday practice, app offers a  convenient  way to perform radiographic measurements for spine, at the spinopelvic juncture - combing sitting and standing X-Rays, in a blink of an eye in front of your screen. The build in features of the app, allows results to be categorized and may help identify the complex “hip-spine” THA patient at high risk for postoperative instability and helps planning the optimum cup placement.

All information received from the software output must be clinically reviewed regarding its plausibility before patient treatment! App indicated for assisting healthcare professionals. Clinical judgment and experience are required to properly use the software.The software is not for primary image interpretation.

Please see tutorial videos at the developer’s web site www.orthopractis.com

References

1. Luthringer, J.M. Vigdorchik A Preoperative Workup of a "Hip-Spine" Total Hip Arthroplasty Patient: A Simplified Approach to a Complex Problem. J Arthroplasty 2019 Jul;34(7S):S57-S70.

2. Pierrepont J, Hawdon G, Miles BP, et al. Variation in functional pelvic tilt in patients undergoing total hip arthroplasty. Bone Joint J 2017;99-B:184.

3 .Langston J, Pierrepont J, Gu Y, Shimmin A. Risk factors for increased sagittal pelvic motion causing unfavourable orientation of the acetabular component in patients undergoing total hip arthroplasty. Bone Joint J 2018;100-B:845.

4. Vigdorchik JM, Sharma AK, Dennis DA, Walter LR, Pierrepont JW, Shimmin AJ. The majority of total hip arthroplasty patients with a Stiff spine Do not have an Instrumented Fusion. J Arthroplasty 2020;35(6S):S252e4.

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App helps preoperatively to identify the complex “hip-spine” THA patient at high risk for instability, with minimal measurements in functional spinopelvic X-ray imaging.

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