Table 3.
Gait analysis, muscle strength, and leg length discrepancy
| Salvage arthroplasty (HA/THA) (N=19) | Internal Fixation (N=77) | P-value | |
|---|---|---|---|
| Gait velocity (m/s)1 | 1.0 (0.6–1.2) | 1.2 (1.1–1.5) | 0.413 |
| Stance time (% of gait cycle)1§b | −1.8 (−5.2–0.1) | −1.6 (−3.8– −0.1) | 0.446 |
| Single support phase (% of gait cycle)1§b | −2.2 (−4.0– −0.2) | −0.5 (−4.4–1.0) | 0.554 |
| Double support phase (% of gait cycle)1§b | −0.3 (−1.7–1.1) | 0.2 (−2.1–2.6) | 0.545 |
| Step length (cm)1§ | 1.8 (−1.5–4.1) | 0.0 (−3.2–3.8) | 0.249 |
| Foot axis (°)1§ | −2.3 (−10.2–9.0) | 0.6 (−5.1–4.9) | 0.402 |
| COP ΔY (cm)1§ | −8.9 (−13.0– −1.8) | 0.4 (−8.1–6.8) | 0.013 |
| VAS score satisfaction with gait pattern1 | 7.1 (4.7–8.5) | 7.4 (5.0–8.7) | 0.847 |
| Flexion (N)1§ | −18.6 (−41.1–9.3) | −1.3 (−13.5–4.1) | 0.108 |
| Extension (N)1§ | −14.1 (−37.5–6.2) | −3.5 (−26.9–13.2) | 0.226 |
| Adduction (N)1§ | −6.9 (−26.0–11.6) | −2.8 (−29.3–19.0) | 0.713 |
| Abduction (N)1§ | −25.4 (−67.5– −17.8) | −20.4 (−35.0–0.7) | 0.025 |
| LLD (cm)1 | 0.0 (−0.8–1.0) | 0.8 (0.3–1.8) | 0.001 |
| Feeling of LLD2 | 3 (16) | 31 (40) | 0.061 |
| VAS score complaints LLD1a | 4.9 (2.6–6.0) | 4.0 (1.5–7.2) | 0.813 |
| Heel lift use2 | 1 (5) | 23 (30) | 0.036 |
HA, Hemiarthroplasty; THA, Total Hip Arthroplasty; LLD, Leg Length Discrepancy; VAS, Visual Analog Scale; COP, Center of Pressure line
Differences between groups were tested with the Mann-Whitney U test for continuous variables, and with the Chi-squared test or Fisher’s exact test for categorical variables.
Data are presented as median with P25-P75 given between brackets.
Data are presented as number with percentages.
The VAS score for complaints as a result of a LLD was only measured in the 34 patients that indicated having the feeling of a LLD.
These variables had >10% missing data, because they require a completely measured gait cycle for both legs, which was often not feasible (Stance Time 14% missing and Single/Double Support Phase 54%).
The values displayed for these variables represent the difference between the two legs (Parameter fractured leg – Parameter contralateral leg).
A negative value therefore represents a decrease in the fractured leg, a positive value an increase.