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• iOS/iPadOS          DynamicHip

• Apple Vision Pro  DynamicHipVision

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Transform calibrated hip measurements into an immersive 3D biomechanics workspace with live vectors, pressure fields, and guided optimization.

 iOS/iPadOS  DynamicHip

 

Dynamic Hip turns a calibrated pelvic image into a structured, explainable hip-biomechanics workspace for orthopaedic education, measurement review, planning sensitivity, and documentation.

Designed for orthopaedic surgeons, trainees, researchers, and medical educators, the app combines a guided 19-point registration workflow with bilateral geometric and biomechanical analysis. Import an image from Photos or Files, use the supported camera workflow on iPhone or iPad, calibrate scale, and place each anatomical landmark with a stable concentric-circle selector. Pan, zoom, nudge, undo, replace, or review points without losing the original registration sequence.

MEASURE AND REVIEW

Dynamic Hip calculates and displays image-derived descriptors of:

• Femoral-head coverage
• Pelvic and femoral lever arms
• R/G5 and P/G5 relationships
• Model-relative load and pressure
• Supporting angle and contact-area estimates
• Estimated force and mean model stress
• Edge-loading sensitivity
• Offset, hip-centre position, reconstruction height, and bilateral differences
• Sigma, theta, load, pressure, contact-area, and edge-sensitivity graphs

REGISTER ONCE — EXPLORE IN PROTECTED LAYERS

Dynamic Hip keeps the original anatomical registration separate from every simulation:

1. Registered anatomy remains unchanged.
2. Reversible femoral simulation lets you explore controlled position changes.
3. Advanced Biomechanics provides a separate planning copy.
4. Suggestions & Optimization generates uncommitted candidates for comparison.

SUGGESTIONS & OPTIMIZATION STUDIO

Analyze three planning-sensitivity pathways independently:

• Acetabular corrective-osteotomy sensitivity
• Proximal-femoral corrective-osteotomy sensitivity
• Hip-arthroplasty reconstruction sensitivity

Each pathway recalculates bounded candidate geometries through the same measurement engine. Dynamic Hip compares the current and proposed states, rejects insignificant or boundary-limited results, and identifies the best accepted result only as the “Best bounded model candidate.”

This result represents a mathematical comparison within the selected pathway and programmed search limits. It is not an automatic operation, implant position, or treatment recommendation.

BEFORE, OVERLAY, AND AFTER

Use three coordinated views to understand each proposed change:

• Before shows the active measured or simulated construction.
• Overlay combines the current and candidate geometry with correction arrows.
• After emphasizes the candidate while preserving the original registration.

The visual language remains consistent:

• Orange shows the current selected-area construction.
• Green shows the uncommitted candidate.
• Cyan shows active load vectors.
• Red shows active pressure and edge-loading information.

Pathway-specific guided steps explain the direction of correction, the values that changed, and the assumptions that still require clinical verification.

A candidate is applied only by an explicit user action and only to a reversible planning layer. Registered points, the source image, and baseline results remain protected.

COMPARE THE BIOMECHANICS

Review current-versus-candidate values using clear metric cards and before-and-after graphs. Depending on the selected pathway, comparisons may include:

• Coverage
• Load and pressure ratios
• Contact-area estimates
• Estimated force and mean model stress
• Edge-loading sensitivity
• Offset and horizontal hip-centre change
• Reconstruction height
• Coronal correction
• Cup-inclination sensitivity
• Head-diameter assumptions
• Objective improvement

REPORT AND EXPORT

Export text reports, CSV data, and annotated images for teaching, research documentation, case discussion, and independent review.

LOCAL-FIRST WORKFLOW

Images, registered coordinates, measurements, simulations, and planning candidates are processed locally in the app. Dynamic Hip does not automatically upload clinical images or measurements to Orthopractis. Exports occur only when initiated by the user.

IMPORTANT

Dynamic Hip is a professional educational, measurement, documentation, and planning-sensitivity aid.

Its load, pressure, stress, edge-loading, and optimization outputs are mathematical model estimates derived from the registered image and stated assumptions. They are not direct joint-pressure measurements, diagnosis, treatment recommendations, implant selection, finite-element analysis, surgical navigation, or patient-specific operative prescriptions.

All measurements and proposed candidates must be verified by a qualified orthopaedic professional using the complete clinical and imaging context before any medical decision.

IOS/IPADOS REVIEW FLOW
1. Launch and review the mandatory consent. Acceptance is intentionally requested after every fresh process launch and is not permanently stored.
2. Choose Photos or Files. Select a local, edited, HEIC, or iCloud-hosted still image. The app uses a file-first PHPicker pipeline with data/UIImage fallbacks and displays progress while a provider download completes.
3. Enter profile/calibration inputs and place the known marker.
4. Follow the fixed 19-point sequence. Double-tap registers the fixed centre of the concentric-circle selector. Pan, zoom, nudge, undo, backtracking, and deletion remain available.
5. Open Results and Graphs.
6. Open Biomechanics to review force, area, estimated mean stress, edge sensitivity, and planning curves. This layer does not overwrite the baseline.
7. Open Suggestions & Optimization Studio, select a side, enter maturity/degeneration/congruency/symptom context, and tap Analyze all three pathways.
8. Review acetabular, femoral, and arthroplasty candidates separately. Use Before/Overlay/After and the comparison graphs. Orange is current geometry; green is an uncommitted candidate.
9. Follow the guided steps. Apply changes only when testing the reversible planning copy; registered points remain unchanged.
10. Export text, CSV, or an annotated image.

VISIONOS REVIEW FLOW
1. Select the DynamicHipVision target/platform version.
2. Import through the dedicated Photos scene or Files, calibrate, and register points.
3. Open Results, Graphs, Control Deck, and Optimization Studio windows.
4. Open the calibrated volume or immersive laboratory. Enable points, axes, cyan load vectors, red pressure field, orange current construction, and green target.
5. Change a reversible scenario or recalculate a pathway and observe live spatial updates.

• Apple Vision Pro  DynamicHipVision

Dynamic Hip for Apple Vision Pro transforms calibrated pelvic-image analysis into an interactive spatial biomechanics experience.

The native visionOS app combines guided registration, bilateral biomechanics, volumetric reconstruction, immersive visualization, and reversible planning sensitivity.

FROM IMAGE TO SPATIAL MODEL

Import a pelvic image, calibrate scale, and complete the exact 19-point anatomical registration workflow. A concentric-circle selector supports point placement, while pan, zoom, nudging, undo, replacement, and next-point guidance preserve a consistent sequence.

After registration, Dynamic Hip generates a calibrated three-dimensional presentation derived from the measured geometry. When both femoral-head centres are available, the spatial origin is based on their current three-dimensional midpoint.

The anatomical model remains unobstructed so the landmarks, vectors, pressure field, and proposed geometry can be reviewed clearly.

SEE THE BIOMECHANICS IN SPACE

Volumetric and immersive views can display:

• Pelvic and femoral landmarks
• Femoral-head and proximal-femoral constructions
• Measurement lines, axes, arrows, and cylinders
• Bilateral load vectors in cyan
• Pressure and edge-loading vectors in red
• A spherical pressure field
• Current selected-area geometry in orange
• Uncommitted optimization targets in green
• Live updates after point, simulation, or planning changes

Use mixed, progressive, or full immersive presentation according to the review task. Floating controls can be hidden or revealed so the anatomy remains visible without unnecessary panels obscuring the model.

THREE SEPARATE OPTIMIZATION PATHWAYS

The Suggestions & Optimization Studio evaluates:

• Acetabular corrective-osteotomy sensitivity
• Proximal-femoral corrective-osteotomy sensitivity
• Hip-arthroplasty reconstruction sensitivity

Each pathway modifies only a temporary planning copy of the relevant geometry. Registered anatomy, original measurements, the source image, and the contralateral hip remain protected.

Dynamic Hip recalculates bounded candidates and compares:

• Load and pressure
• Contact-area estimates
• Estimated force and mean model stress
• Edge-loading sensitivity
• Coverage
• Offset and horizontal hip-centre position
• Reconstruction height
• Coronal alignment
• Cup-inclination sensitivity
• Head-diameter assumptions

Candidates with insufficient improvement or a minimum at a hard search boundary are rejected.

The “Best bounded model candidate” is only the accepted mathematical result within the selected pathway and programmed search limits. It is not an operation, implant target, or clinical recommendation.

BEFORE, OVERLAY, AND AFTER

• Before shows the active measured or simulated construction.
• Overlay combines orange current geometry, green candidate geometry, and correction arrows.
• After emphasizes the candidate while subduing the current construction.

Optional green candidate vectors support comparison with the active cyan load and red pressure field.

GUIDED SPATIAL CORRECTION

Pathway-specific guidance explains:

• Which anatomical region is being reviewed
• Which geometry is temporarily changed
• The direction and magnitude of the proposed correction
• The biomechanical values before and after
• The assumptions that remain unchanged
• The additional clinical and three-dimensional factors requiring independent verification

Guided controls can be used in the Optimization Studio and immersive presentation. A proposed candidate remains uncommitted until the user explicitly applies it to a reversible planning layer.

MEASUREMENTS, GRAPHS, AND EXPORT

Review bilateral coverage, lever-arm relationships, R/G5, P/G5, model-relative load and pressure, contact area, estimated force, estimated mean model stress, offset, height, centre displacement, and edge-loading sensitivity.

Original and advanced graphs remain available in dedicated windows for detailed before-and-after comparison.

Export text reports, CSV data, and annotated results for education, research documentation, and case review.

LOCAL-FIRST WORKFLOW

Images, points, measurements, simulations, and planning states are processed locally in the app. No clinical image or measurement is automatically uploaded to Orthopractis.

IMPORTANT

Dynamic Hip for Apple Vision Pro is an educational, measurement, documentation, and planning-sensitivity aid.

Its three-dimensional depth, load, pressure, stress, edge-loading, and optimization outputs are model-based estimates derived from a two-dimensional source image and explicit assumptions.

It is not CT segmentation, finite-element analysis, surgical navigation, implant selection, diagnosis, or a patient-specific prescription.

A qualified orthopaedic professional must verify every measurement and proposed candidate using the complete clinical and imaging context before any medical decision.

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The Suggestions and Optimization module is designed to help visualize how changes in acetabular orientation, femoral geometry, or arthroplasty reconstruction may influence load distribution, pressure concentration, coverage, and edge-loading tendency. The module compares measured anatomy with simulated correction scenarios and presents visually the most favorable biomechanical outcome, supporting preoperative planning, postoperative evaluation, and teaching.

DYNAMIC HIP — PROFESSIONAL DISCLAIMER

Dynamic Hip is a professional measurement, visualization, education, documentation and planning-sensitivity aid. Image projection, calibration, point placement, profile values, reference data and planning assumptions can materially affect every output. Load, pressure, estimated force, contact area, estimated mean stress, edge-loading graphs, optimization scores, green candidates and 3D fields are mathematical estimates. They are not direct sensor measurements, CT/MRI segmentation, finite-element analysis, diagnosis, treatment advice, implant selection, an osteotomy cut plan, surgical navigation, a wear-rate prediction or a validated patient-specific optimum. Registered anatomy remains separate from reversible simulation and planning copies. A qualified professional must independently verify every input, result, graph, candidate, guided step, spatial object and export before use. Do not use the app as the sole basis for patient management or in an emergency.
 

Download_on_the_App_Store_Badge_US-UK_135x40.png
06A9D494-E995-4FB6-A8BF-B8CEA072CCF7_1_102_o_edited.jpg

Transform calibrated hip measurements into an immersive 3D biomechanics workspace with live vectors, pressure fields, and guided optimization.

Download_on_the_App_Store_Badge_US-UK_135x40.png

Reference

1. Book -Werner Konermann, Gerd Gruber, Christian Tschauner (1999)
Die Hüftreifungsstörung Diagnose und Therapie  Springer-Verlag
ISBN 978-3-642-58695-8

2. Legal H (1977) Biomechanische Analyse des Hiiftgelenks. Ein Beitrag mit besonderer Berucksichtigung der Druckberechnung und der klinischen Anwendung. Habilitationsschrift, Universitat Erlangen Nurnberg. 

3. Pauwels F (1935) Der Schenkelhalsbruch, ein mechanisches Problem. Grundlagen des Heilungsvorganges, Prognose und kausale Therapie. Z Orthop Chir 63 (Beilageheft).

4. Book- Tönnis, Dietrich (1987) Dysplasia and Dislocation of the Hip in Children and Adults. Chapter 4, Current Knowledge on the Biomechanics of the Hip, page 26-57. Book

5.Matthiessen H.D.:(1997) Dysplasie- und Therapiefaktor bei der Huftreifungsstorung. Z. Orthop. 135 01 12-13 

6.Wiberg G. The anatomy and roentgenographic appearance of a normal hip joint. Acta Chir Scand. 1939;83:7-38

7 .Tönnis D. Normal values of the hip joint for the evaluationX-rays in children and adults. Clin Orthop Relat Res 1976; (119):39-47

8. Novais EN1, Pan Z, Autruong PT, Meyers ML, Chang FM.Normal Percentile Reference Curves and Correlation of Acetabular Index and Acetabular Depth Ratio in Children. J Pediatr Orthop. 2016 Jun 2. [Epub ahead of print]

9.Murphy SB, Ganz R, Muller ME: The prognosis  of untreated dysplasia of the hip: A study of radio-graphic factors that predict the outcome. J BoneJoint Surg 77A:985–989, 1995

10 .Delaunay S, Dussault RG, Kaplan PA, Alford BA Review Radiographic measurements of dysplastic adult hips  Radiographic measurements of dysplastic adult hips. Skeletal Radiol. 1997 Feb;26(2):75-81.

[11] Bergmann G, Deuretzbacher G, Heller M, et al. Hip contact forces and gait patterns from routine activities. J Biomech. 2001;34:859–871. PMID 11410170. https://pubmed.ncbi.nlm.nih.gov/11410170/
[12] Bergmann G, Graichen F, Rohlmann A. Hip joint loading during walking and running, measured in two patients. J Biomech. 1993;26:969–990. PMID 8349721. https://pubmed.ncbi.nlm.nih.gov/8349721/
[13] Rüdiger HA, Guillemin M, Latypova A, Terrier A. Effect of changes of femoral offset on abductor and joint reaction forces in total hip arthroplasty. Arch Orthop Trauma Surg. 2017. PMID 28905107. https://pubmed.ncbi.nlm.nih.gov/28905107/
[14] Miki H, Kyo T, Kuroda Y, Nakahara I, Sugano N. Risk of edge-loading and prosthesis impingement due to posterior pelvic tilting after total hip arthroplasty. Clin Biomech. 2014;29:607–613. PMID 24933660. https://pubmed.ncbi.nlm.nih.gov/24933660/
[15] Dorr LD, Malik A, Dastane M, Wan Z. Combined anteversion technique for total hip arthroplasty. Clin Orthop Relat Res. 2009;467:119–127. PMID 18979146. https://pubmed.ncbi.nlm.nih.gov/18979146/
[16] Venkatadass K, Durga Prasad V, Al Ahmadi NMM, Rajasekaran S. Pelvic osteotomies in hip dysplasia: why, when and how? EFORT Open Rev. 2022. PMID 35192506. https://pubmed.ncbi.nlm.nih.gov/35192506/
[17] Garcia S, Demetri L, Starcevich A, Gatto A, Swarup I. Developmental Dysplasia of the Hip: Controversies in Management. Curr Rev Musculoskelet Med. 2022. PMID 35489017. https://pubmed.ncbi.nlm.nih.gov/35489017/
[18] Armiger RS, Armand M, Tallroth K, Lepistö J, Mears SC. Three-dimensional mechanical evaluation of joint contact pressure in 12 periacetabular osteotomy patients with 10-year follow-up. Acta Orthop. 2009. PMID 19404795. https://pubmed.ncbi.nlm.nih.gov/19404795/
[19] Goetz JE, Thomas-Aitken HD, Sitton SE, Westermann RW, Willey MC. Joint contact stress improves in dysplastic hips after periacetabular osteotomy but remains higher than in normal hips. Hip Int. 2023;33:298–305. PMID 34348517. https://pubmed.ncbi.nlm.nih.gov/34348517/
[20] Aitken HD, et al. Radiographically successful periacetabular osteotomy does not achieve optimal contact mechanics in dysplastic hips. Clin Biomech. 2023;104:105928. PMID 36906984. https://pubmed.ncbi.nlm.nih.gov/36906984/
[21] Aitken HD, Glass NA, Miller A, et al. Persistently elevated joint contact stress after periacetabular osteotomy is associated with joint failure at minimum 10-year follow-up. J Orthop Res. 2024;42:2773–2783. PMID 39030968. https://pubmed.ncbi.nlm.nih.gov/39030968/
[22] Lerch TD, Steppacher SD, Liechti EF, Tannast M, Siebenrock KA. One-third of hips after periacetabular osteotomy survive 30 years with good clinical results, no progression of arthritis, or conversion to total hip arthroplasty. Clin Orthop Relat Res. 2017;475:1154–1168. PMID 27905061. https://pubmed.ncbi.nlm.nih.gov/27905061/

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