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Chapter Summary
• Context: Spinal orthoses temporarily modify spine biomechanics by restricting motion, redistributing mechanical loads, controlling progressive deformities, or supporting tissues during recovery. Their clinical use spans acute trauma, deformities, degenerative diseases, osteoporosis, and postoperative care. However, "wearing a brace" is not a uniform intervention: therapeutic efficacy depends on the anatomical segment treated, brace rigidity, contact area, underlying pathology, and patient compliance. Furthermore, the literature demonstrates variable benefits across clinical indications. Modern rigid internal instrumentation has reduced the need for routine external immobilization in many postoperative scenarios. The chapter organizes orthotic devices by anatomical region and therapeutic purpose, discussing biomechanical mechanisms, indications, and limitations, emphasizing that device selection must balance mechanical protection against comfort, functional mobility, and risks of prolonged immobility.
• Chapter Objective: To present biomechanical principles and types of orthoses across different spinal regions, correlating them with major traumatic, degenerative, deformity, and postoperative indications. The reader will understand that efficacy depends on appropriate device and patient selection, and learn to critically assess clinical scenarios where routine bracing lacks evidence.
• The Biomechanical PrincipleSpinal mobility varies according to regional anatomy, facet orientation, intervertebral discs, musculature, and adjacent structures. Consequently, different segments require distinct control mechanisms. Orthoses restrict motion, augment external support, alter load distribution, or provide postural biofeedback. Increased stiffness does not automatically guarantee superior clinical outcome.
• Devices by Anatomical RegionIn the cervical spine, the spectrum ranges from soft collars to rigid cervical collars (e.g., Philadelphia, Miami J) and cervicothoracic orthoses (CTO, Minerva) or halo vests for maximal stability. In the thoracolumbar and lumbosacral spine, orthoses (TLSO, LSO, Jewett, CASH) control flexion, extension, lateral bending, or rotation across indicated levels.
• Trauma and OsteoporosisIn stable thoracolumbar compression or burst fractures without neurological deficits, TLSO bracing can provide comfort and motion restriction. However, recent randomized trials demonstrate equivalent functional outcomes without bracing in selected stable fracture patterns. In osteoporotic vertebral fractures, dynamic orthoses provide postural support and pain relief when integrated into active rehabilitation and osteoporosis medical therapy.
• DeformitiesIn adolescent idiopathic scoliosis (AIS) with remaining skeletal growth (Risser 0-2), rigid full-time bracing (e.g., Boston, Milwaukee, Rigo-Cheneau) effectively halts curve progression, with success directly proportional to daily wear compliance. In adult deformities, bracing provides temporary symptomatic support rather than definitive structural curve correction.
• Postoperative CareModern rigid spinal instrumentation typically provides sufficient biomechanical stability without routine external bracing. Postoperative orthoses are individualized based on osteotomy extent, severe osteoporosis, suboptimal bone purchase, or patient-specific protection goals.
• Clinical Application: Prescribing an orthosis requires defining the specific therapeutic objective: motion restriction, load unloading, deformity progression control, or surgical protection. Match the device to the anatomical segment; a soft collar will not stabilize subaxial instability. Assess patient compliance, body habitus, skin integrity, and functional independence. Discomfort and excessive rigidity cause non-compliance and muscle deconditioning. Postoperatively, avoid routine automatic bracing when rigid internal fixation is biomechanically stable.
