Table 1.
Description of the parameters considered in the geometric parameter analysis. Parameters are either defined for the combined overall shape of both J-Curves or individually for the medial and lateral side (column: overall/medial and lateral).
| Parameter Name | Overall/Medial and Lateral | Unit | Description |
|---|---|---|---|
| Mean distal ML spacing | Overall | mm | Mean mediolateral distance of the distal points of the lateral/medial 3D J-Curve (15° of extension to 20° of flexion, reference: radius of the circle fitted to the distal portion of the condyles). Inspired by Walker [24]. |
| Mean posterior ML width | Overall | mm | Mean mediolateral distance of the posterior points of the lateral/medial 3D J-Curve (20°–120° of flexion, reference: radius of the circle fitted to the posterior portion of the condyles). Inspired by Mahfouz [25]. |
| AP length | Medial and lateral | mm | Anteroposterior length of the medial/lateral 3D J-Curve. |
| Distal radius | Medial and lateral | mm | Radius of the circle fitted to the distal portion of the medial/lateral 3D J-Curve. The calculation was performed according to Nuno and Ahmed [15] and is described in more detail in Asseln et al. [26]. |
| Posterior radius | Medial and lateral | mm | Radius of the circle fitted to the posterior portion of the medial/lateral 3D J-Curve. The calculation was performed according to Nuno and Ahmed [15] and is described in more detail in Asseln et al. [26]. |
| Functional arc length | Medial and lateral | mm | Arc length of the medial/lateral 3D J-Curve between 15° of extension until 120° of flexion (reference: center of the circle fitted to the distal/posterior portion of the condyles). |
| Arc length 15° Ext.–20° Flex. |
Medial and lateral | mm | Arc length of the medial/lateral 3D J-Curve between 15° of extension until 20° of flexion (reference: center of the circle fitted to the distal portion of the condyles). |
| Arc length 20°–120° Flex. |
Medial and lateral | mm | Arc length of the medial/lateral 3D J-Curve between 20° until 120° of flexion (reference: center of the circle fitted to the distal/ posterior portion of the condyles). |
| Mean abs. deviation | Medial and lateral | mm | Mean absolute deviation (mean condylar offset) regarding anteroposterior and proximodistal direction. |
| Max abs. deviation | Medial and lateral | mm | Maximum absolute deviation (maximum condylar offset) regarding anteroposterior and proximodistal direction. |