Reena et al. [1] state that “the subscapularis plane block is the same plane where axillary nerve is blocked via the anterior approach between the deltoid and subscapularis muscles”. The “anterior approach” referred to here is known as the “Fajardo approach” [2]. However, the chronological record suggests otherwise. The anterior approach to axillary nerve block was first described by Sondekoppam et al. [3] in 2016, and it was termed the “subscapularis plane block”. The “Fajardo approach” [2], described four years later (2020), was conceptually similar to the original “subscapularis plane block” [3], as both were performed in the same fascial plane and targeted the same nerves. Specifically, the subscapularis plane block [3] involved an injection between the pectoralis major and subscapularis muscles, while the Fajardo approach [2] targeted the space between the deltoid and subscapularis muscles. In my view, the term “subscapularis plane block” [3] remains the more appropriate and descriptive term, as it more accurately reflects the sonoanatomy.

In addition, several regional anesthesia techniques described in recent years share conceptual and sonoanatomical similarities with the subscapularis plane block, despite being introduced under different names [4]. The inter-fascial injection in the “shoulder anterior capsular (SHAC) block” [5] closely resembles that of the “subscapularis plane block”. The pericapsular nerve group (PENG) block, published later the same year (2020) [6], is comparable to the deeper (pericapsular) injection variant of the SHAC block [5].

There is some ambiguity regarding the recently introduced “anterior glenoid block” [7]. It appears similar to the “subscapularis plane block” in that it targets the “articular branches of axillary and subscapular nerves” as specified by the authors who introduced it [7]. However, given the site of injection-deep to subscapularis muscle-it more closely resembles the pericapsular injection of the SHAC block or the PENG block. Another technique, the “coracobrachialis-subscapularis muscle plane block” is essentially identical to the “subscapularis plane block” in terms of anatomical target and injection plane [8]. Collectively, these blocks share an anatomical and conceptual foundation, differing primarily in probe positioning and precise injection sites.

In summary, any regional anesthesia technique in which the injection is administered superficial to the subscapularis muscle around the shoulder joint-between any muscles such as the deltoid, pectoralis major, or coracobrachialis-can be classified as a “subscapularis plane block”. This technique is intended to target the axillary and subscapular nerves (Fig. 1). The “Fajardo approach”, the superficial (interfascial) injection of the SHAC block, and the “coracobrachialis-subscapularis muscle plane block” all fall within this category. In contrast, injections administered deep to the subscapularis muscle are better classified as either the “pericapsular” block (the deeper variant of the SHAC block) or the “PENG” block. These blocks aim to anesthetize the articular branches of the shoulder joint. Notably, the “anterior glenoid block” also belongs to this category.

Readers should remain cautious of the varied nomenclature applied to anatomically similar techniques and strive to avoid confusion when interpreting or applying them.