Suprascapular nerve blockage for painful shoulder pathology - a systematic review and meta-analysis of treatment techniques

The suprascapular nerve block (SScNB) is easily administered using a landmark-based technique: A cadaveric study to assess nerve staining post-injection

Aims

The suprascapular nerve is an ideal target for nerve blockade to alleviate shoulder pain given its widespread innervation to the shoulder girdle. To widen availability of this treatment, we investigate whether an anatomical landmark technique can be adopted by novice injectors to provide efficacious blockade.

Methods

Five injectors were recruited with varying experience. 10 shoulders of Thiel embalmed cadavers were injected with blue dye. Written instructions and an illustration of the Dangoisse landmark technique were provided prior to injection. Cadavers were dissected and the presence or absence of dye staining reported by three observers and a consensus agreement reached.

Results

Dissection demonstrated diffuse staining in the suprascapular fossa. 90% of shoulders had adequate staining of the suprascapular nerve directly, or distal branches, which would provide adequate anaesthesia. Inter-observer agreement was good (k = 0.73) for staining at the supraspinous fossa and excellent (k = 0.87) for staining distally. The technique was performed by novice injectors with a good success rate.

Conclusion

This technique is reproducible by a range of clinicians to effectively provide anaesthesia of the SScN. Within a resource strained healthcare environment greater uptake of this technique is likely to be of benefit to a wider group of patients.

Physical harms associated with suprascapular nerve block interventions in the non-surgical management of acute and chronic shoulder pain: A systematic review

Background

The utility of the suprascapular nerve block (SSNB) in the non-surgical management of shoulder pain continues to be explored, whilst its associated physical harms have not. This systematic review aims to report the physical harms associated with the SSNB in the non-surgical management of shoulder pain.

Methods

A search was undertaken of AMED, CINAHL, Cochrane Library, EMBASE, Medline, Pubmed, and Scopus databases. Studies were included if they reported the presence or absence of harm following a SSNB intervention (injection, pulsed radiofrequency, ablation) in the non-surgical management of acute or chronic shoulder pain. Excluded studies were those which utilised SSNB for peri, intra, or post-surgical intervention. The McMaster tool for assessing quality of harms assessment and reporting was utilised.

Results

A total of 111 studies were included in this review of which 168 episodes of harm were reported across 4142 participants. Harm severity ranged from pneumothorax (n = 5) to local pain and bruising (n = 50). The quality of harms assessment and reporting across all studies was poor.

Discussion

Despite heterogeneity in SSNB intervention, and low-quality evidence, SSNB carries a low risk of physical harm. Further work is needed in addressing the poor quality of harms assessment and reporting in SSNB studies.

Ultrasound-Guided Suprascapular Nerve Block at Suprascapular Notch-Do We Really Target Suprascapular Notch or Not? Where Is Our Real Target?

Ultrasound (US)-guided suprascapular nerve block (SSNB) is a widely used procedure and while describing the US-guided SSNB in the suprascapular notch, the suprascapular fossa is often visualized and injection is performed in that location. Although it can be done in both location, to inject the right area, the terminology should be settled and the visualization of these areas which are unclear and confusing in the literature should be clarified. In this sense, we showed the course of the nerve on a cadaver and briefly describe a protocol to correctly visualize the suprascapular notch with US.