Table 2.
Temporal-spatial, kinematic, and kinetic gait parameter variables of operated hips in the HRS and MHE groups six and 12 weeks postoperatively. Data are described by means and standard deviation (SD). Differences within and between groups are analysed by a repeated measurement model where 1 indicates difference in changes over time between groups, 2 is the difference in level between groups, and 3 indicates changes over time within groups
| Variables | HRS group (N = 11) | MHE group (N = 11) | P values | ||||
|---|---|---|---|---|---|---|---|
| 6 weeks (mean/SD) | 12 weeks (mean/SD) | 6 weeks (mean/SD) | 12 weeks (mean/SD) | 1 | 2 | 3 | |
| Temporal-spatial variables | |||||||
| Gait speed (m/s) | 1.19 (0.3) | 1.32 (0.2) | 1.10 (0.3) | 1.25 (0.2) | 0.9 | 0.4 | 0.001 |
| Cadence (steps/min) | 113.2 (14.1) | 118.4 (8.4) | 110.0 (10.7) | 115.7 (4.6) | 0.9 | 0.5 | 0.01 |
| Stride (m) | 1.27 (0.2) | 1.33 (0.1) | 1.19 (0.2) | 129 (0.1) | 0.4 | 0.4 | 0.004 |
| Step length operated leg (m) | 0.64 (0.1) | 0.68 (0.1) | 0.60 (0.1) | 0.66 (0.1) | 0.6 | 0.4 | <0.001 |
| Stand phase operated leg (%) | 61.2 (1.6) | 60.6 (0.8) | 62.0 (2.9) | 61.2 (1.9) | 0.8 | 0.4 | 0.05 |
| Single support operated leg (%) | 37.6 (2.4) | 38.9 (1.3) | 36.5 (3.7) | 38.9 (3.7) | 0.4 | 0.6 | 0.01 |
| Kinematic variables | |||||||
| Max hip flexion (angles in degrees) | 35.2 (5.0) | 34.5 (5.3) | 31.9 (8.0) | 31.5 (4.4) | 0.9 | 0.1 | 0.7 |
| Max hip extension (angles in degrees) | 5.5 (6.9) | 1.5 (6.2) | 3.0 (7.4) | −2.2 (4.2) | 0.6 | 0.2 | 0.001 |
| ROM in sagittal plan (angles in degrees) | 29.6 (7.2) | 33.6 (5.9) | 29.2 (5.6) | 33.6 (3.9) | 0.8 | 0.9 | >0.001 |
| Max adduction (angles in degrees) | 4.5 (2.8) | 4.2 (3.1) | 4.9 (5.8) | 6.0 (4.5) | 0.4 | 0.5 | 0.6 |
| Max abduction (angles in degrees) | −5.4 (4.5) | −7.3 (4.3) | −4.6 (4.3) | −5.9 (2.3) | 0.7 | 0.5 | 0.05 |
| ROM in frontal plan (angles in degrees) | 9.8 (3.2) | 11.5 (2.3) | 9.5 (3.2) | 11.9 (2.7) | 0.5 | 1.0 | 0.001 |
| Max internal rotation (angles in degrees) | 8.1 (5.7) | 7.3 (5.0) | 9.4 (6.2) | 10.0 (6.2) | 0.7 | 0.3 | 1.0 |
| Max external rotation (angles in degrees) | −5.7 (5.8) | −9.0 (4.4) | −5.2 (4.5) | −7.5 (10.3) | 0.8 | 0.7 | 0.2 |
| ROM in transverse plan (angles in degrees) | 13.7 (2.9) | 16.3 (6.0) | 13.6 (4.8) | 17.6 (5.8) | 0.6 | 0.8 | 0.01 |
| Kinetic variables | |||||||
| Max. positive moments sagittal plane (Nmm/kg) | 688.7(333.8) | 863.4 (347.7) | 664.8 (271.5) | 816.9 (214.5) | 0.8 | 0.8 | 0.004 |
| Max. negative moments sagittal plane (Nmm/kg) | −635.8 (209.5) | −748.6 (211.8) | −513 (171.3) | −675.4 (238.2) | 0.5 | 0.2 | 0.001 |
| Max. positive moments frontal plane (Nmm/kg) | 718.4 (78.3) | 733.3 (117.4) | 651.6 (127.4) | 773.5 (149.6) | 0.01 | 0.8 | 0.002 |
| Max. negative moments frontal plane (Nmm/kg) | −101.2 (101) | −71.3 (31.3) | −106.5 (87.1) | −117.1 (47.8) | 0.3 | 0.3 | 0.6 |
| Max. positive moments transverse plane (Nmm/kg) | 62.6 (26.8) | 65.9 (39.0) | 60.5 (26.6) | 77.6 (31.9) | 0.2 | 0.7 | 0.06 |
| Max. negative moments transverse plane (Nmm/kg) | −93.7 (36.8) | −124.8 (45.8) | −72.6 (51.1) | −97.9 (53.1) | 0.6 | 0.2 | <0.001 |
| Total work (power in watts) | 19.5 (9.1) | 27.0 (11.2) | 17.8 (8.6) | 25.0 (8.9) | 0.9 | 0.6 | <0.001 |
HRS hip resurfacing system, MHE conventional hybrid prosthesis