Radiographic Evidence of Cranial Bone Mobility

A Review of Oleski, Smith & Crow (2002)

Can cranial bone movement be measured objectively?

A 2002 study published in CRANIO: The Journal of Craniomandibular Practice by Oleski, Smith, and Crow sought to answer that question by examining whether cranial manipulation produced measurable changes on radiographs.

The Question: Do Cranial Bones Move?

The concept of cranial bone mobility has long been central to cranial osteopathic and manual therapy traditions. However, critics have questioned whether subtle cranial motion can be objectively verified.

Oleski and colleagues aimed to determine:

Does external cranial manipulation produce measurable changes in cranial vault and base alignment visible on x-ray?

This retrospective chart review included:

• 12 adult patients

• Each had pre- and post-treatment x-rays

• Head position was stabilized using a fixed positioning device

Researchers measured angular relationships between specific cranial landmarks, including:

• Atlas

• Mastoid

• Malar line

• Sphenoid

• Temporal line

Key Findings

The study reported measurable angular changes after cranial vault manipulation:

• Atlas: mean change of 2.58°

• Sphenoid: mean change of 2.42°

• Temporal line: 1.75°

• Mastoid: 1.66°

• Malar line: 1.25°

Importantly:

• 91.6% of patients showed measurable differences at three or more cranial sites.

The authors concluded that cranial bone mobility could be documented and measured radiographically (Oleski et al., 2002).

Why This Matters

The sphenoid, temporal, and occipital regions form the structural base of the cranium and interact with:

• The cranial vault

• The craniovertebral junction

• The temporomandibular system

If measurable positional changes occur following manipulation, this suggests:

• Mechanical responsiveness of cranial sutures or articulations

• Potential neuromechanical influence on cranial base alignment

• Objective parameters for evaluating cranial intervention

This study provides one of the few radiographic investigations addressing cranial mobility directly.

Important Considerations

While provocative, several factors should be kept in mind:

• The study sample was small (n = 12).

• It was retrospective, not randomized or controlled.

• Radiographic angular change does not necessarily equate to functional or clinical improvement.

• Measurement reliability and examiner consistency are critical in radiographic landmark studies.

Additionally, cephalometric radiography is sensitive to small variations in positioning, even with stabilization devices (Houston, 1983).

Therefore, while the findings are compelling, larger controlled studies are needed to confirm reproducibility and clinical relevance.

Clinical Takeaway

Oleski, Smith, and Crow (2002) reported measurable angular changes in cranial landmarks following cranial vault manipulation, with most patients demonstrating changes at multiple sites.

For clinicians working in cranial or TMJ-focused care, this study contributes to an ongoing dialogue:

Can cranial mechanics be objectively measured?

This investigation suggests that under controlled conditions, radiographic changes may be detectable — though further research is required to fully understand their meaning.

References

Houston WJ. The analysis of errors in orthodontic measurements. Am J Orthod. 1983;83(5):382–390.

Oleski SL, Smith GH, Crow WT. Radiographic evidence of cranial bone mobility. Cranio. 2002;20(1):34–38.

Radiographic Evidence of Cranial Bone Mobility, Oleski, S, Smith G, Crow W

Cranio: The Journal of Craniomandibular Practice ; Jan 2002;20(1):34-8

The purpose of this retrospective chart review was to determine if external manipulation of the cranium alters selected parameters of the cranial vault and base that can be visualized and measured on x-ray. Twelve adult patient charts were randomly selected to include patients who had received cranial vault manipulation treatment with a pre- and post-treatment x-ray taken with the head in a fixed positioning device. The degree of change in angle between various specified cranial landmarks as visualized on x-ray was measured. The mean angle of change measured at the atlas was 2.58 degrees, at the mastoid was 1.66 degrees, at the malar line was 1.25 degrees, at the sphenoid was 2.42 degrees, and at the temporal line was 1.75 degrees. 91.6% of patients exhibited differences in measurement at three or more sites. This study concludes that cranial bone mobility can be documented and measured on x-ray.