Related Experiment Video
Updated: Jul 14, 2026
Measurement of Dynamic Scapular Kinematics Using an Acromion Marker Cluster to Minimize Skin Movement Artifact
Published on: February 10, 2015
Correlation of Acetabular Cup Placement Angles Between an Artificial Intelligence-Powered System Using a Smartphone
Sachiyuki Tsukada1, Hiroyuki Ogawa1, Masayoshi Saito1
1Department of Orthopaedic Surgery, Hokusuikai Kinen Hospital, Ibaraki, Japan.
Background:
An automated measurement system for the placement angles of acetabular cup in total hip arthroplasty prostheses was developed utilizing artificial intelligence (AI) algorithms. The AI-powered system enables immediate measurement by capturing an anteroposterior pelvic X-ray through a smartphone camera.
Methods:
While developing the AI-powered measurement system, we trained AI utilizing 100 labeled anteroposterior pelvic X-rays to recognize the hip joint and 483 labeled anteroposterior pelvic X-rays to identify anatomical landmarks and the acetabular cup. To validate the AI-powered system, we measured the acetabular cup placement angles of 126 unlabeled post-total hip arthroplasty anteroposterior pelvic X-rays with both the AI-powered system and conventional measurement methods and assessed the correlation between the 2 methods.
Results:
The Pearson's correlation coefficients for the acetabular cup placement angles measured using the AI-powered system and conventional method were 0.88 (95% confidence interval, 0.84-0.92, P < .001) in inclination angle and 0.76 (95% confidence interval, 0.67-0.83, P < .001) in anteversion angle, respectively.
Conclusions:
Both inclination and anteversion angles measured using the AI-powered system showed a strong correlation with angles obtained through conventional methods.
