Related Experiment Video
Updated: Jan 18, 2026

In Vivo Quantification of Hip Arthrokinematics during Dynamic Weight-bearing Activities using Dual Fluoroscopy
Published on: July 2, 2021
Fossa-Foveolar Mismatch Is Highest in Dysplastic Hips and During External Rotation
Vera M Stetzelberger1,2, Cem Cek1, Jannine T Segessenmann1
1Department of Orthopaedic Surgery and Traumatology, HFR Cantonal Hospital, University of Fribourg, Fribourg, Switzerland.
Purpose:
To identify which hip pathomorphologies and motions are associated with a high fossa-foveolar mismatch (FFM) index.
Methods:
Three-dimensional models of hips with femoroacetabular impingement syndrome or developmental dysplasia of the hip (DDH) and control hips were analyzed. Simulations of the physiological range of motion and impingement tests were performed using validated collision detection software. The FFM index-the proportion of the fovea tracking outside the acetabular fossa-was calculated for each motion.
Results:
A total of 183 hips with femoroacetabular impingement syndrome and 22 control hips were included. DDH hips showed the highest FFM index (median 0.4), followed by hips with excessive femoral version (median 0.3). Controls had the lowest values (median 0.2). External rotation had the highest FFM in all groups. Motions such as flexion, extension, and abduction had the lowest FFM values.
Conclusions:
DDH and excessive femoral version were linked to increased FFM, while hips from the control group presented the lowest mismatch. From all analyzed motions, the highest FFM was found in external rotation in all groups.
Level Of Evidence:
Level III, retrospective cohort study.
More Related Videos
Related Concept Videos
Bones of the Lower Limb: Femur and Patella
Bones of the Lower Limb: Tibia and Fibula
Bones of the Upper Limb: Humerus
Bone Formation by Intramembranous Ossification
The process begins when mesenchymal cells in the embryonic skeleton gather together and differentiate into osteogenic cells, which then develop into ...
Functional Classification of Joints
The functional classification of joints is determined by the amount of mobility between the adjacent bones. Joints are functionally classified as a synarthrosis or immobile joint, an amphiarthrosis or slightly moveable joint, or as a diarthrosis, a freely moveable joint. Fibrous and cartilaginous joints can be functionally classified as either synarthroses or amphiarthroses, whereas all synovial joints are classified as diarthroses.
Synarthrosis
An...
Eccentric Axial Loading in a Plane of Symmetry

