Table 1.
Normative contact mechanics data arranged from maximum flexion → full extension. Contact area values are reported in mm2 with ±1SD. Contact centroid and peak strain locations on both patella and femur are reported in millimeters (±1SD) with medial, superior, and anterior directions as positive.
| Knee Angle | Contact Area (±SD) | Centroid on Femur | Centroid on Patella | Peak Strain on Femur | Peak Strain on Patella | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Medial | Superior | Anterior | Medial | Superior | Anterior | Medial | Superior | Anterior | Medial | Superior | Anterior | ||
| 40 | 228.7 (173.6) | −7.9 (6.1) | −0.8 (3.2) | 4.8 (2.4) | −9.0 (7.0) | 1.5 (3.0) | −3.6 (1.5) | −10.8 (9.5) | −1.3 (3.6) | 5.9 (2.4) | −12.0 (11.0) | 2.0 (3.1) | −3.4 (2.0) |
| 35 | 204.7 (187.8) | −6.8 (6.6) | 1.2 (3.5) | 5.5 (2.5) | −7.8 (7.1) | −0.4 (2.8) | −3.4 (1.5) | −8.3 (9.9) | 0.7 (4.0) | 6.4 (2.7) | −9.6 (10.8) | −0.4 (3.5) | −3.2 (2.3) |
| 30 | 137.4 (163.5) | −5.6 (6.9) | 3.0 (3.5) | 6.0 (2.3) | −6.4 (7.4) | −2.3 (2.9) | −3.1 (1.9) | −6.6 (9.7) | 2.9 (4.0) | 6.7 (2.5) | −7.7 (10.3) | −2.4 (3.4) | −3.1 (2.5) |
| 25 | 108.9 (130.1) | −5.2 (8.1) | 4.8 (3.5) | 6.3 (2.3) | −5.7 (8.2) | −4.1 (3.1) | −2.8 (2.0) | −5.5 (10.5) | 4.8 (4.2) | 6.8 (2.5) | −6.2 (11.0) | −4.4 (3.4) | −2.7 (2.8) |
| 20 | 100.8 (108.7) | −4.8 (7.5) | 6.8 (3.3) | 6.2 (2.0) | −4.8 (7.0) | −5.6 (2.8) | −2.7 (1.8) | −5.5 (10.1) | 6.7 (3.8) | 6.9 (2.2) | −6.4 (10.5) | −5.7 (3.5) | −2.5 (2.5) |
| 15 | 129.5 (94.3) | −5.0 (7.5) | 8.6 (3.4) | 6.1 (1.9) | −5.0 (6.2) | −7.1 (2.7) | −2.5 (1.6) | −6.2 (9.6) | 9.1 (3.6) | 6.7 (2.3) | −6.0 (9.3) | −7.2 (3.2) | −2.3 (2.3) |
| 10 | 125.1 (92.8) | −6.5 (5.8) | 10.5 (3.1) | 5.6 (2.3) | −5.4 (5.0) | −8.8 (2.6) | −2.1 (1.3) | −8.0 (8.6) | 10.9 (3.4) | 6.0 (2.5) | −6.7 (8.6) | −9.1 (2.7) | −2.0 (1.8) |