Neurology Edited by Professor Emeritus Desire' Dubounet, IMUNE

Example: T12 flexion measurements of 50° and 90° are matched withsacral (hip) flexion measurements of 25° and 65°, respectively. Sacral(hip) extension angles are 10° and 10°, respectively, while the tightest SLRis measured at 70° and 75°, respectively.In the first test, there is total sacral (hip) motion of 25° + 10° = 35°,compared to a straight leg raise of 70°, which fails the validation criterionof SLR (total sacral (hip) motion is exceeded by more than 101). In thesecond test, however there is total sacral (hip) motion of 65° + 10° = 75°,exactly identical to the SLR of 75° on the second test, producing a validtest. In this case, the true lumbar motion is 25° (90°-65°) and theimpairment rating, according to Table 56, is 7% (sacral flexion angle = 45°+, true lumbar flexion angle = 15-30°).AnkylosisAnkylosis in the lumbosacral spine has significance only if immobilityoccurs in both the hips and the lumbar spine region, so that that neutralposition cannot be attained in the sagittal plane. This is a very rare event.isolated fusions of either a hip or two to three spinal levels place additionalstresses on adjacent segments, but do not lead to biomechanical failure ofthe functional unit. Thus, impairments related to fusion of part of thelumbar/hip motion complex are treated only under the Abnormal MotionSection of Table 56.Lumbosacral Region-Lateral FlexionAbnormal Motion