Association Between Forward Head, Rounded Shoulders, and Increased Thoracic Kyphosis: A Review of the Literature
Deepika Singla, MPT Sports, BPT and Zubia Veqar, PhD, MPT Ortho, BPT
Centre for Physiotherapy and Rehabilitation Sciences,
Jamia Millia Islamia,
Jamia Nagar, Okhla, Delhi, India
OBJECTIVE: The purpose of this review was to explore the association between forward head posture, rounded shoulders, and increased thoracic kyphosis.
METHODS: The PubMed, ERIC, and Cochrane databases were searched using the key words posture, head, shoulder, forward scapular posture, and thoracic kyphosis through December 2016.
RESULTS: Our initial search yielded 6,840 research studies, 6,769 of which were excluded because they either were duplicates or did not satisfy the inclusion criteria. After the abstracts of the remaining studies were read, 15 were assessed for eligibility, and only 4 papers were included in the present review. Cervical lordosis values were found to be significantly associated with thoracic kyphosis values. Also, there were significant correlations between rounded shoulders and increased thoracic kyphosis.
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CONCLUSION: Forward head posture, rounded shoulders, and increased thoracic kyphosis can exist alone or in any combination.
KEYWORDS: Kyphosis; Posture; Shoulder
From the FULL TEXT Article:
Various occupations require people to assume static postures for long periods, which causes continuous contractions of the head and neck muscles. [1, 2] The head constitutes 6% of the total body weight, which is linked to the cervical spine and all other joints through the kinematic chain  by various muscles.
Normally, the cervical spine is lordotic. Other than flexion and extension movements of the neck that take place in the sagittal plane, protraction and retraction movements also come into play in this plane. Protraction movement is a result of extension of the upper cervical spine and flexion of the lower cervical spine, whereas retraction movement results from flexion of the upper cervical spine and extension of the lower cervical spine. If the cervical spine is held in protracted position for prolonged duration, it can lead to alterations in head posture ultimately leading to poor posture known as forward head posture (FHP), which is thought to be a deviation from neutral or normal posture. [4, 5]
Normal posture is defined as when the line of gravity (LOG) passes through the external auditory meatus, the bodies of the cervical spine, and the acromion and anterior to the thoracic spine  (Fig 1). Normally, the external moment produced by gravity and ground reaction forces at a joint is offset by the internal moment produced by various muscles and other soft tissue structures around that joint. However, presence of postural malalignments may require greater internal forces to balance the external torque produced by gravity, which in turn is exaggerated owing to the altered location of the LOG. [7-9]
Failure of the head to align with the vertical axis of the body [3, 10] (Fig 2) can lead to further malalignments in the body, namely, rounded shoulders and increased thoracic kyphosis, [11, 12] to compensate  for the altered location of the LOG, leading to further impairments.  Combination of all these postural deviations is often known as “slouched posture” [15, 16] or “slumped posture.” [3, 17]