Articles: surgery.
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Recent studies indicate that clavipectoral fascia plane block (CPB) efficacy may stem from injectate distribution to the anterosuperior clavicular periosteum. We conducted an anatomical study combining the CPB with injection within the subclavius muscle. ⋯ Our anatomical study demonstrates that the midclavicular block achieves effective distribution around the middle third of the clavicle, although complete circumferential anaesthesia of the clavicular periosteum was not achieved. Although this block may provide periosteal and bone anaesthesia, it does not address other sources of pain, such as muscle spasms and skin components. Additional clinical studies are needed to evaluate the overall efficacy of this dual block technique for clavicle surgery.