Table 2.
Between groups comparison of cross-sectional area (mm2) of ventral neck muscles (longus colli = LCO, longus capitis = LCA, sternocleidomastoid = SCM)
| Muscle | LCO left | LCO right | LCA left | LCA right | SCM left | SCM right |
|---|---|---|---|---|---|---|
| WAD < 40* | ||||||
| Median (mm2) | 61.6 | 71.2 | 55.4 | 57.4 | 400.5 | 426.9 |
| Range (mm2) | 73.7 | 52.3 | 32.6 | 38.8 | 248.6 | 249.2 |
| Number | 20 | 20 | 20 | 20 | 14 | 15 |
| (Drop-out*) | (0) | (0) | (0) | (0) | (6) | (5) |
| WAD ≥ 40* | ||||||
| Median (mm2) | 52.9 | 59.6 | 43.9 | 47.8 | 323.2 | 354.4 |
| Range (mm2) | 51.2 | 43.9 | 33.2 | 3.9 | 284.6 | 313.3 |
| Number | 9 | 9 | 9 | 9 | 8 | 9 |
| (Drop-out*) | (2) | (2) | (2) | (2) | (3) | (2) |
| Controls* | ||||||
| Median (mm2) | 63.0 | 65.3 | 50.3 | 54.6 | 403.9 | 404.4 |
| Range (mm2) | 50.1 | 56.3 | 68.6 | 56.3 | 363.4 | 333.6 |
| Number | 28 | 28 | 28 | 28 | 25 | 27 |
| (Drop-out) | (3) | (3) | (3) | (3) | (6) | (4) |
| p = | 0.22 | 0.09 | 0.11 | 0.23 | 0.22 | 0.26 |
WAD Whiplash Associated Disorders, NDI Neck Disability Index
* moderate WAD (NDI < 40), severe WAD (NDI ≥ 40) and age- and sex-matched healthy controls. Drop-out is unclear imaging, not possible to analyse