Application of ZedHip for Preoperative Planning in Total Hip Arthroplasty
Objective
In total hip arthroplasty (THA), simulate implant size and cup placement angle preoperatively to improve surgical precision.
Subjects
- Cases: 15 cases, 15 joints
- Sex: 4 male, 11 female
- Age: Mean 68.2 years (52–81 years)
Evaluation Items
- Cup placement angle (anteversion, abduction)
- Stem size and placement position
- Discrepancy between the preoperative plan and intraoperative measurements
Results
The discrepancy between the preoperative plan and intraoperative measurements fell within an acceptable range, also contributing to reduced surgical time.
Discussion
3D preoperative planning facilitated plan sharing among surgeons and was suggested to be useful for training young surgeons.
ZedMotion Case Study: Predicting Range of Motion After Total Hip Arthroplasty
Objective
In total hip arthroplasty, predict postoperative joint range of motion before surgery to evaluate dislocation risk.
Subjects
- Cases: 14 cases, 14 joints
- Sex: 5 male, 9 female
- Surgical approach: THA via posterolateral approach
Evaluation Items
- Joint ROM in flexion and internal rotation
- Relationship between implant placement angle and dislocation risk
- Comparison of preoperative predictions with postoperative measurements
Results
High-risk dislocation positions were identified preoperatively and reflected in fine adjustments to the implant placement angle.
Discussion
Preoperative ROM simulation enabled fine-tuning of the implant placement angle and was considered to contribute to reducing dislocation risk.
ZedHip
Overview
A module that supports preoperative planning for total hip arthroplasty and osteotomy. It builds 3D models of the pelvis and femur from CT images, allowing simulation of implant size and cup placement angle.
ZedHip creates 3D models of the bone using CT data, and supports planning and assessing THA (Total Hip Arthroplasty).
User can perform surgical simulations (such as positioning of implants, calculation of parameters, etc.) in simple steps, and also calculate ROM (Range Of Motion) of the hip.
Features
- Intuitive operation on the 3D model
- Templates based on extensive installation experience
- Report output for sharing surgical records
Database of Patient Records
User can import CT data (in DICOM format) into a database application.
Patient information (such as name, sex, date of birth, etc.) can be managed uniformly.
Positioning of Implants
User can select cup and stem from a library of commercially-available implants.
Implants can be placed at optimal positions on 3D model and MPR (multi-planar reconstruction) images.
Calculation of Parameters
ZedHip can calculate parameters (such as anteversion, inclination, resection amount, etc.) using reference points and coordinate axes.
Results can be used intra-operatively to perform surgery accurately.
ROM Simulation
ZedHip can measure ROM of the hip and display the position of impingement.
Risk of post-operative malfunction (such as dislocation) can be reduced.
Post-Operative Assessment (Optional)
User can compare and assess how implant placement parameters have been changed and placed against the reference plane or reference axis as well as how much the alignment has changed after the operation as compared with pre-operative plans made with ZedHip 3D.
