The Amendolara et al. meta-analysis, published in Frontiers in Medicine in 2024, is the largest pooled analysis of craniosacral therapy research to date. With 24 randomised controlled trials and 1,613 participants, it brings more data to the question of CST's effectiveness than any earlier review. The scale alone is worth noting: a serious effort to synthesise what the clinical literature actually shows.
The headline finding from the primary outcome analysis was that CST showed no significant effects for any of the conditions examined. This was the pre-specified main result, not a side finding from an exploratory analysis.
Making sense of that finding — and what it doesn't say — means looking at both the methods and the limitations the authors themselves discussed.
Scale and scope of the review
Twenty-four RCTs is a meaningful number for a complementary therapy research base. The conditions covered were wide: musculoskeletal pain, headache, neurological conditions, infant presentations, and various other states. The 1,613 participants span those presentations, so the review is asking a broad question rather than a narrow one.
A meta-analysis combines results from individual studies to get a pooled estimate. When single trials are too small to detect a real effect with confidence, combining them can produce a sample large enough to find what individual studies miss. The Amendolara analysis did this across its 24 trials.
The primary outcome — the pre-registered, planned comparison the study was designed for — showed no statistically significant effects. This is the most rigorous part of the review and the finding to weight most heavily. When the data were combined and analysed by the protocol, CST did not separate from control conditions.
Primary versus secondary findings
Secondary and exploratory analyses — comparing subgroups, looking at specific conditions in isolation, examining outcomes that weren't the main focus — produced some borderline results. This isn't unusual, and it's important to understand what it means.
Exploratory analyses are less reliable than primary ones because they happen after seeing the data. Run enough comparisons and some will look significant by chance. This is the multiple comparisons problem, and it's why pre-registered primary outcomes carry more weight than post-hoc explorations. The borderline results in the secondary analyses of the Amendolara review are worth noting but shouldn't be treated as strong evidence of benefit.
The authors were appropriately cautious about exploratory findings. A well-run meta-analysis distinguishes between what it was designed to find and what it stumbled onto, and Amendolara made that distinction clearly.
The review's acknowledged limitations
One of the more honest features of this meta-analysis is its handling of its own limits. The authors noted significant heterogeneity across the included studies. The trials studied different populations using different CST protocols and measured outcomes in different ways. Pooling heterogeneous studies can produce a misleadingly precise estimate, and the authors were candid about that.
The studies themselves are also small. Small RCTs are prone to random variation. A single study might show a positive or negative result that a larger trial would even out. Despite its 24-study scope, Amendolara was still constrained by the modest size of the original trials.
The authors also wrote that existing theoretical models for how CST works "contradict our modern understanding of health and disease." That echoes biological plausibility concerns raised elsewhere. It's a striking line from researchers who set out to examine the evidence fairly rather than to advocate.
For people who find real benefit in CST sessions, this review doesn't erase that experience. What it does is set honest expectations: at the population level, across the best available designs, the evidence doesn't show reliable, significant effects. Individual sessions can still be meaningful, and many people find them so.
The Amendolara meta-analysis is as honest a snapshot of the current research as a single study can be. Its findings deserve serious attention without dismissing what happens between a skilled practitioner and a client who finds the work genuinely helpful.