Dropped Head Syndrome: A Spine Surgeon's Framework for Surgical Decision-Making and Fusion-Level Selection

Abstract

Adult Dropped Head Syndrome (DHS) is an uncommon but disabling condition in which failure of the cervical extensor mechanism leads to a chin-on chest posture and loss of horizontal gaze. Its true population prevalence is unknown because the condition is rare, etiologically heterogeneous, and reported mainly through small series and reviews. The diagnosis is often clinically recognizable, but the underlying causes include isolated neck extensor myopathy, inflammatory and neuromuscular disorders, Parkinsonian syndromes, motor neuron disease, cervical spondylotic disease, post-surgical deformity, radiation related myopathy, and iatrogenic muscle injury. For the spine surgeon, the central issue is not simply confirming DHS, but determining when a flexible neuromuscular postural problem has become a structural deformity requiring reconstruction.

This adult-focused narrative review discusses DHS from a surgical decision-making perspective. Emphasis is placed on identifying reversible causes, 
distinguishing flexible from fixed deformity, assessing neurological compromise, evaluating whole-spine sagittal alignment, and planning durable fixation. The evidence base remains limited and consists largely of case reports, retrospective series, and systematic reviews of heterogeneous cohorts. Nonoperative treatment remains appropriate for early, flexible, or medically treatable cases, but recent pooled evidence suggests that surgical reconstruction provides the most reliable restoration of horizontal gaze in selected patients with disabling or progressive deformity.

The major technical decisions include the need for decompression, the role of anterior release or osteotomy, whether to include the occiput, and how far  distally to extend the fusion. In most surgically significant cases, C2 provides a useful upper anchor while preserving occipitocervical motion. Distally, constructs should usually cross the cervicothoracic junction, particularly in patients with poor extensor muscle quality, osteoporosis, high T1 slope, thoracic kyphosis, or global sagittal malalignment. The objective is durable restoration of functional horizontal gaze, not radiographic perfection.