Related Experiment Video
Updated: Jul 20, 2025
06:26
Stereo-Imaging System DLT Calibration to Capture 3D In Situ Displacements of Stretched Peripheral Nerves
Published on: January 12, 2024
433
Three-Dimensional Distance Mapping to Identify Safe Zones for Lateral Column Lengthening
Ben Efrima1, Agustin Barbero1, Kuharajan Ramalingam1
1Foot and Ankle Unit, Humanitas San Pio X Hospital, Milan, Italy.
Foot & Ankle International
|August 5, 2023
Summary
This study used 3D models and distance mapping to define safe zones for lateral column lengthening osteotomies, aiming to reduce surgical risks in collapsing feet.
Area of Science:
- Orthopedic Surgery
- Biomechanical Engineering
- Medical Imaging
Background:
- Lateral column lengthening (LCL) osteotomies are standard for flexible, progressive collapsing feet.
- Evans (E-LCL) and Hintermann (H-LCL) osteotomies have risks, including subtalar osteoarthritis due to iatrogenic damage.
- Os calcis subtalar joint (OCST) subtypes present challenges for specific osteotomy techniques.
Purpose of the Study:
- To measure the safe zones for E-LCL and H-LCL using 3D models and distance mapping (DM).
- To hypothesize that safe zones can be measured with high reproducibility.
- To potentially reduce iatrogenic damage during LCL procedures.
Main Methods:
- Categorized 200 feet into OCSTs using the Bruckner classification.
- Measured proximal and distal extents of posterior safe zone (PSZ) for H-LCL and anterior safe zone (ASZ) for E-LCL angles.
- Assessed interrater and intrarater agreement using interclass correlation.
Main Results:
- Defined mean PSZ angles (68-75 degrees) and ASZ angles (89-95 degrees).
- Found no statistically significant differences in safe zones between OCSTs.
- Achieved good to excellent interrater and intrarater agreement; 18 cases were unsuitable for planning.
Conclusions:
- Distance mapping can measure safe zones for LCL, aiding preoperative planning.
- 3D models and DM enhance the reliability of preoperative plans for complex bone structures.
- This approach may reduce the risk of iatrogenic damage in LCL surgeries.
Related Concept Videos
01:10Design Example: Measuring Distance Between Two Points with Obstructions
65
When measuring distances in areas with physical obstructions, such as a lake in a field, surveyors must employ techniques to calculate accurate lengths without direct line measurements. One effective method is the offset technique, which allows for precise distance estimation over inaccessible stretches.In this scenario, a surveyor must measure a side of an area that crosses a lake. Since the measuring tape cannot span the lake, the surveyor begins by establishing a baseline that aligns with...
65
01:15Distance Corrections
50
To achieve precise distance measurements, especially in surveying and construction, certain corrections must be applied to account for potential sources of error like the standardization errors, temperature variations, and slope adjustments.Standardization error emerges when measurement equipment undergoes changes, such as wear, repairs, or weather impacts. To address this, surveyors compare the equipment’s readings to a standard. This process identifies any deviation that might lead to...
50
01:18Distance Measurements by Taping
66
Tapes are essential in surveying for accurate, durable, and short-distance measurements. Made from lightweight, nylon-coated steel, they offer flexibility and strength for rugged outdoor use. The nylon coating protects against rust and wear, extending the tape's life. Standard lengths, around 30 meters, are marked in meters and millimeters for precision.Surveyors select tapes based on site conditions and accuracy needs. Lightweight, nylon-coated tapes are commonly used for ease of handling and...
66