This ANDERSON2_readme20250919.txt file was generated on 20250919 by Rich Lisonbee. ------------------- GENERAL INFORMATION ------------------- 1. Title of Dataset Dual Fluoroscopy In Vivo Pelvic and Hip Joint Kinematics in Patients With Cam Femoroacetabular Impingement Syndrome 2. Author Information Principal Investigator Contact Information Name: Andrew E. Anderson Institution: University of Utah Address: 590 Wakara Way, Salt Lake City, UT 84108 Email: Andrew.Anderson@hsc.utah.edu ORCID: 0000-0003-4708-2608 Department: Orthopaedics Associate or Co-investigator Contact Information Name: Penny R. Atkins Institution: University of Utah Address: 50 S Centra Campus Dr., Salt Lake City, UT 84108 Email: penny.atkins@utah.edu ORCID: 0000-0001-9930-2604 Department: Kahlert School of Computing Associate or Co-investigator Contact Information Name: Niccolo Fiorentino Institution: University of Vermont Address: 33 Colchester Ave Votey 231B, Burlington, VT 05401 Email: niccolo.fiorentino@uvm.edu ORCID: 0000-0003-0263-6769 Department: Mechanical Engineering Associate or Co-investigator Contact Information Name: Rich Lisonbee Institution: University of Utah Address: 590 Wakara Way, Salt Lake City, UT 84108 Email: rich.lisonbee@hsc.utah.edu ORCID: 0000-0002-1124-5754 Department: Orthopaedics Associate or Co-investigator Contact Information Name: Jared Zitnay Institution: University of Utah Address: 590 Wakara Way, Salt Lake City, UT 84108 Email: jared.zitnay@utah.edu ORCID: 0000-0002-6134-6473 Department: Orthopaedics Associate or Co-investigator Contact Information Name: Lindsay Schuring Institution: University of Utah Address: 590 Wakara Way, Salt Lake City, UT 84108 Email: lindsay.schuring@utah.edu ORCID: 0000-0002-5262-7281 Department: Orthopaedics 3. Date of data collection 2014 to 2016 4. Date of data availability 2025 5. Geographic location of data collection: The University of Utah, Salt Lake City UT 6. Information about funding sources that supported the collection of the data: NIH grants: R01-AR077636, R56-AR074416, R21-AR063844, F32-AR067075, F32-AR078019, S10-RR026565, R01-GM083925. Financial support was also provided by the LS Peery Discovery Program in Musculoskeletal Restoration -------------------------- SHARING/ACCESS INFORMATION -------------------------- 1. Licenses/restrictions placed on the data: CC BY NC - Allows others to use and share your data non-commercially and with attribution. 2. Links to publications that cite or use the data: -https://doi.org/10.1002/jor.24509 -https://doi.org/10.1016/j.jbiomech.2022.111424 -https://doi.org/10.1002/jor.25332 -https://doi.org/10.1177/23259671211073834 3. Links to other publicly accessible locations of the data: NA 4. Links/relationships to ancillary data sets: NA 5. Was data derived from another source? NA 6. Recommended citation for the data: Atkins, P., Fiorentino, N., Lisonbee, R., Zitnay, J., & Schuring, L., Anderson, A. (2025). Dual Fluoroscopy In Vivo Pelvic and Hip Joint Kinematics in Patients With Cam Femoroacetabular Impingement Syndrome. The Hive: University of Utah Research Data Repository. https://doi.org/10.7278/S5d-btv7-ztpw. Please cite the repository DOI as well as the following publication: https://doi.org/10.1002/jor.24509 --------------------- DATA & FILE OVERVIEW --------------------- 1. File List A. Filename: Participant_Demographics.xlsx Short description: Demographic information for Cam (patients) and Norm (asymptomatic/ control) participants. B. Filename: Event_Frames.xlsx Short description: Frames used for normalization of the data for each activity. C. Filename: /SubjID Short description: Each folder contains participant-specific data including surface mesh .k files, 1 landmark .xlsx file, 2 CT scans for knee and hip in .nii files, 9 transforms (motion) .txt files. 2. Relationship between files: The Cam FAIS Biomechanics data repository is a collection of: a. hip 3D clinical computed tomography (CT) images (.nii) b. surface files of the proximal femur and ipsilateral hemipelvis associated with CT imaging files (.k) c. activity/ rigid body transforms/ kinematic transform activities (.txt) These files are organized into 18 folders (listed above) based on the trial participant they were derived from. Participants form two groups; Cam (femoroacetabular impingement syndrome (FAIS) patients) and Norm (asymptomatic/ control). The demographic information for each participant is captured in the Participant_Demographics excel file. For a detailed description of participant selection, data collection, and data processing methods, please refer to https://doi.org/10.1002/jor.24509. Cam_FAIS_Biomechanics ├─Participant_Demographics demographics (.xlsx) ├─Event_Frames normalization frames (.xlsx) └───SubjID ├─SubjID_[Bone(s)] surface mesh (.k) ├─SubjID_Landmarks anatomical landmarks (.xlsx) ├─DFS_SubjID_[Activity] motion data (.txt) ├─SubjID_Hip_CT hip CT (.nii.gz) └─SubjID_Knee_CT knee CT (.nii.gz) The surface mesh files, landmark file, activity files, and CT files in each folder are described in following sections. Surface models of different bones were derived from CT image files. Landmarks were derived from surface models and were used to track bone location throughout activity trials. 3. Additional related data collected that was not included in the current data package: NA 4. Are there multiple versions of the dataset? No -------------------------- METHODOLOGICAL INFORMATION -------------------------- 1. Description of methods used for collection/generation of data: The Cam FAIS Biomechanics data repository is a collection of hip 3D clinical computed tomography (CT) images (.nii), associated surface files of the proximal femur and ipsilateral hemipelvis (.k), and rigid body transforms (.txt). CT images and rigid body transforms were collected directly from participants in two groups - Cam and Norm. Landmarks were derived from Surface models, which were generated from CT scans. For a detailed description of participant selection, data collection, and data processing methods, please refer to https://doi.org/10.1002/jor.24509 2. Methods for processing the data: CT images were collected in a supine position and segmented to create surface files of the proximal and distal femur, as well as the ipsilateral hemipelvis. In vivo motion of the pelvis and femur bones of each participant were captured using markerkelss biplane videoradiography during self-selected speed level-walking, incline (5 degrees) walking as well as during functional hip joint center (FHJC), abduction, inversion, and everion tasks. Joint angles, joint translations, and pelvic rotation angles were calculated using a custom script in MATLAB. For a detailed description of participant selection, data collection, and data processing methods, please refer to https://doi.org/10.1002/jor.24509 3. Instrument- or software-specific information needed to interpret the data: Visualization of the subject-specific motion profiles of the hip from the dual fluoroscopy measured kinematics can be done using FEBio with the following steps: i. Install FEBio Studio. a. Create an account on FEBio.org: https://febio.org/register/ b. Once you have activated your account, login and navigate to the downloads page https://febio.org/downloads/ c. Select the latest FEBio Studio installation package that is suitable for your machine. ii. Load model in FEBio Studio. a. After installation, open the software, and select “New Model” under Start or by selecting File>New Model, then select “OK”. NOTE: For visualization there is no need to name the model or select a model type. b. At the top of the window, select Tools>Kinemat … c. Press the ellipses to the right of each field for the dialog box to select your files. For the Model file, select the subject-specific surface file (SubjID_Femur_Pelvis.k) followed by the activity file (DFS_subject_id_Walk.txt) to be observed and then select “OK”. d. Once loaded at the top of the FEBio window there are controls to play through the activity and observe the in vivo bone motion 4. Standards and calibration information, if appropriate: CT imaging: CT images of the hip and distal femur were acquired with a SOMATOM Definition 128 CT scanner (Siemens AG, Munich, Germany). For the proximal femur and pelvis, images were acquired at 120 kVp, 1.0 mm slice thickness, and 200–400 mAs with variable fields of view due to participant size. For the distal femur, images were acquired at 120 kVP, 3.0 mm slice thickness, and 150 mAs. The femur and pelvis were segmented and reconstructed from CT images (Amira, v5.6; FEI, Hillsboro, OR). Trial activities: Each participant performed activities of daily living, including standing with feet at hip-width and pointed forward, level walking at a standardized speed (1.3 m/s), level and incline (5°) walking at a self-selected speed, internal and external rotational pivots to end range of motion, a functional star-arc maneuver,26 and unassisted abduction to approximately 45°. For the rotational pivots, study participants were individually positioned to result in the proper positioning at their end range of motion. The feet were placed parallel, roughly hip-width apart, and generally symmetric. However, if necessary for data collection, the foot of the imaged hip may have been more anterior for external rotation or posterior for internal rotation. The star-arc maneuver, which is commonly used for functional hip joint center assessments in gait analysis, included five positions of hip flexion-extension and abduction-adduction followed by circumduction performed in a continuous manner. Each participant performed dynamic activities on an instrumented treadmill (Bertec Corporation, Columbus, OH) with the hip of interest positioned in the combined field of view of the custom DF system (Radiological Imaging Services, Hamburg, PA), which consisted of two pairs of X-ray emitters and image intensifiers mounted on independent bases and arranged with an overlapping field of view (Fig. 1). Images were captured at 100 Hz while fluoroscopy settings ranged from 78 to 100 kVp and 1.9–3.2 mAs with camera exposures of 4.5–7.0 ms. For a detailed description of participant selection, data collection, and data processing methods, please refer to: doi.org/10.1002/jor.24509 5. Environmental/experimental conditions: NA 6. Describe any quality-assurance procedures performed on the data: Two trials were performed for each activity when possible, but limitations due to activity level, allotted DF time, and image quality resulted in some activities not being included for some participants (see table 2 in doi.org/10.1002/jor.24509) 7. People involved with sample collection, processing, analysis and/or submission: Penny Atkins, PhD; Niccolo Fiorentino, PhD; Joseph Hartle; Stephen Aoki, MD; Christopher Peters, MD; Bo Foreman, PhD; Andrew Anderson, PhD ------------------------------------------------------------------------------------------------ DATA-SPECIFIC INFORMATION FOR: SubjID folders (Cam_03 through Cam_09 and Norm_02 through Norm_15) ------------------------------------------------------------------------------------------------ 1. Number of files: 12-15 2. Cases: 18 (note: cases refer to the 18 participants) 3. Variable List [NOTE: This section might make more sense to further sub-divide into file types? That way the description of all the activities makes more sense and isn't just floating by itself?] A. Name: SubjID_Femur.k Description: Surface model of the ipsilateral proximal femur, saved in native CT imaging reference frame (SubjID_Hip_CT.nii.gz) in LS-DYNA (.k) format. Segmentations of the bone from the original CT images were performed in Amira, v5.6, 6.0.1, and 6.2.0; FEI, Hillsboro, OR. B. Name: SubjID_Femur_Pelvis.k Description: Combined surface model of the ipsilateral femur and pelvis, saved in native CT imaging reference frame (SubjID_Hip_CT.nii.gz) in LS-DYNA (.k) format. Segmentations of the bone from the original CT images were performed in Amira, v5.6, 6.0.1, and 6.2.0; FEI, Hillsboro, OR. C. Name: SubjID_Knee.k Description: Surface model of the ipsilateral distal femur, saved in native CT imaging reference frame (SubjID_Knee_CT.nii.gz) in LS-DYNA (.k) format. Segmentations of the bone from the original CT images were performed in Amira, v5.6, 6.0.1, and 6.2.0; FEI, Hillsboro, OR. D. Name: SubjID_Pelvis.k Description: Surface model of the ipsilateral pelvis, saved in native CT imaging reference frame (SubjID_Hip_CT.nii.gz) in LS-DYNA (.k) format. Segmentations of the bone from the original CT images were performed in Amira, v5.6, 6.0.1, and 6.2.0; FEI, Hillsboro, OR. E. Name: SubjID_Landmarks.xlsx Description: Landmarks were derived from the the surface files (.k), in the native CT imaging space. These landmarks can be used to define anatomical coordinate systems to derive joint angles. Landmarks and abbreviations: -FJC - Femoral Joint Center -Knee Midpt - Knee Midpoint -Knee Axis - Knee Axis -GT - Greater Trochanter -LT - Lesser Trochanter -Knee Medial - Knee Medial -Knee Lateral - Knee Lateral -AJC - Acetabular Joint Center -LASI - Left Anterior Superior Iliac Spine -LPSI - Left Posterior Superior Iliac Spine -RASI - Right Anterior Superior Iliac Spine -RPSI - Right Posterior Superior Iliac Spine -LILC - Left Iliac Crest -RILC - Right Iliac Crest F. Name: SubjID_Hip_CT.nii.gz Description: CT image of the participant's proximal pelvis (hip), acquired with a SOMATOM Definition 120 kVp, 1.0 mm slice thickness, and 200–400 mAs with variable fields of view due to participant size (Siemens AG, Munich, Germany). G. Name: SubjID_Knee_CT.nii.gz Description: CT image of the participant's distal femur (knee), acquired with a SOMATOM Definition 128 CT scanner at 120 kVP, 3.0 mm slice thickness, and 150 mAs. (Siemens AG, Munich, Germany). The following are descriptions of the remaining files for each of the kinematic transform activities. All activities were collected at a frame rate of 100 Hz, and were filtered in MATLAB using a 2nd order Butterworth filter with a cut-off frequency of 10 Hz. Each row in the text files represents different timepoints in the activity, with 32 columns representing two 1x16 transformation matrices in concatenated row-major order format for the femur and pelvis respectively. These transformation matrices rigidly transform the surface files from their native CT imaging space to the dual fluoroscopy coordinate system in the lab. In vivo joint kinematics of the hip can be calculated by applying these transforms to anatomical coordinate systems that can be established using provided anatomical landmarks. Notes on variations and specifics for each activity are described below. see additional detail and context in https://doi.org/10.1002/jor.24509. Note: The following are descriptions of 8 comma-delimited text files for each of the kinematic transform activities. All activities were collected at a frame rate of 100 Hz, and were filtered in MATLAB using a 2nd order Butterworth filter with a cut-off frequency of 10 Hz. Each row in the text files represents different timepoints in the activity, with 32 columns representing two 1x16 transformation matrices in concatenated row-major order format for the femur and pelvis respectively. These transformation matrices rigidly transform the surface files from their native CT imaging space to the dual fluoroscopy coordinate system in the lab. In vivo joint kinematics of the hip can be calculated by applying these transforms to anatomical coordinate systems that can be established using provided anatomical landmarks. Notes on variations and specifics for each activity are described below. see additional detail and context in: https://doi.org/10.1002/jor.24509. H. Name: DFS_SubjID_Abduction.txt Description: unassisted abduction to approximately 45 degrees. comma-delimited text file for one of eight kinematic transform activities - see note above. Note: this activity may not be found in every participant dataset (see table 2 in https://doi.org/10.1002/jor.24509). I. Name: DFS_SubjID_FHJC.txt Description: functional hip point center (FHJC) where function star-arc maneuver was performed. Note: this activity may not be found in every participant dataset (see table 2 in: https://doi.org/10.1002/jor.24509). J. Name: DFS_SubjID_Incline.txt Description: walking on slope of 5 degrees at self-selected speed - see participant demographics file for speed. Comma-delimited text file for one of eight kinematic transform activities - see note above. K. Name: DFS_SubjID_PivotER.txt Description: pivots resulting in external rotation at the hip. Comma-delimited text file for one of eight kinematic transform activities - see note above. L. Name: DFS_SubjID_PivotIR.txt Description: pivots resulting in internal rotation at the hip. Comma-delimited text file for one of eight kinematic transform activities - see note above. M. Name: DFS_SubjID_Static.txt Description: standing pose, feed set hip-width apart and pointed forward. Comma-delimited text file for one of eight kinematic transform activities - see note above. N. Name: DFS_SubjID_Walk.txt Description: walking at standardized speed (1.3 m/s). Comma-delimited text file for one of eight kinematic transform activities - see note above. Note: this activity may not be found in every participant dataset (see table 2 in: https://doi.org/10.1002/jor.24509). O. Name: DFS_SubjID_Walk_SS.txt Description: level walking at self-selected speed - see participant demographics file for speed. Comma-delimited text file for one of eight kinematic transform activities - see note above. ------------------------------------------------------- DATA-SPECIFIC INFORMATION FOR: Event_Frames ------------------------------------------------------- 1. Number of variables: 9 2. Cases: 18 (note: cases refer to the 18 total participants) 3. Variable List A. Name: Name (n) Description: study subject identifier of participant B. Name: Side (L/R) Description: laterality of hip in study of participant C. Name: Walk_SS Description: [ipsilateral heelstrike, contralateral heelstrike, ipsilateral heelstrike] D. Name: Walk Description: [ipsilateral heelstrike, contralateral heelstrike, ipsilateral heelstrike] E. Name: Incline Description: [ipsilateral heelstrike, contralateral heelstrike, ipsilateral heelstrike] F. Name: PivotER Description: end range of motion G. Name: PivotIR Description: end range of motion H. Name: FHJC (Function Hip Joint Center or Functional Star-arc) Description: [1, 2, 3, 4, 5, 6, 7, 8, 9] 1. 1st tracked frame 2. start of activity 3. first peak of maximum flexion 4. average of the 2nd peak of maximum flexion and the 1st peak of maximum abduction 5. 2nd peak of maximum abduction 6. average of the 1st peak of minimum flexion and third peak of maximum abduction 7. 2nd peak of minimum flexion 8. start was chosen as the start of flexion or as the time point where flexion crossed the mid-point of the 'home' kinematics if there was no inflection point 9. end was chosen as the peak of minimum abduction after ther circumduction motion I. Name: Abduction Description: end range of motion ------------------------------------------------------- DATA-SPECIFIC INFORMATION FOR: Participant_Demographics ------------------------------------------------------- 1. Number of variables: 8 2. Cases: 18 (note: cases refer to the 18 total participants) 3. Variable List A. Name: name (n) Description: study subject identifier of participant B. Name: height (cm) Description: age of participant C. Name: weight (kg) Description: weight of participant D. Name: BMI (kg/m^2) Description: body mass index of participant E. Name: sex (M/F) Description: sex of participant F. Name: age (years) Description: age of participant G. Name: imaged hip (L/R) Description: laterality of hip in study of participant H. Name: walk_SS and incline speed (m/s) Description: self-selected walking speed and incline walking speed of participant