Standardization of hemipelvis alignment for in vitro biomechanical testing

Area of Science:

• Orthopaedic Research
• Biomechanics
• Anatomy

Background:

• Standardized reference frames are crucial for accurate in vitro biomechanical testing of hemipelvic specimens.
• Current methods for defining hemipelvic reference frames present challenges in reproducibility and accessibility.

Purpose of the Study:

• To establish a robust anatomical reference frame for human hemipelvis specimens in in vitro biomechanical analysis.
• To develop an easy, inexpensive, and reproducible alignment procedure for hemipelvic specimens.
• To assess the repeatability and reproducibility of the proposed alignment method.

Main Methods:

• Defined a reference frame using anatomical landmarks on human hemipelvic specimens.
• Analyzed 53 CT scans (106 hemipelvises) to determine hemipelvic alignment relative to the whole pelvis.
• Developed and validated an alignment procedure, quantifying intra-operator and inter-operator reproducibility.

Main Results:

• No statistically significant differences in hemipelvic alignment were found between male/female or right/left specimens.
• A standard acetabular plane was defined to address uncertainties in acetabular rim identification.
• Intra-operator repeatability was <1.5°, and inter-operator reproducibility was <2.0°, with transverse plane alignment being most repeatable.

Conclusions:

• The developed procedure provides a robust, standardized, and accessible method for aligning hemipelvic specimens in vitro.
• This standardized reference frame enhances the reliability and comparability of biomechanical testing on hemipelvic specimens.
• The findings contribute to improving the accuracy and consistency of research in orthopaedics and biomechanics.