Effects of Spinal Immobilization and Spinal Motion Restriction on Head-Neck Kinematics during Ambulance Transport

AbstractObjective: To determine the influence of ambulance motion on head-neck (H-N) kinematics and to compare the effectiveness of two spinal precaution (SP) protocols: spinal immobilization (SI) and spinal motion reduction (SMR). Methods: Eighteen healthy volunteers (7 females) underwent a series of standardized ambulance transport tasks, across various speeds, under the two SP protocols in a balanced order (n = 12 drivers, n = 7 ambulances). Inertial measurement units were placed on participants’ heads and sternums, with another affixed to the stretcher mattress frame. Outcome measures included H-N displacement and acceleration. Results: Ambulance accelerations varied across driving tasks (2.5–9.5 m/s2) and speeds (3.0–6.2 m/s2) and resulted in a wide range of H-N displacements (7.2–22.6 deg) and H-N accelerations (1.4–10.9 m/s2). Relative to SMR, SI resulted in reduced H-N motion during turning, accelerating, and speed bumps (1.9–10.7 deg; 0.4–2.6 m/s2), but increased H-N accelerations during abrupt s...