Clark DRM, Piscoya AS, Dunn JC, et al. - A systematic review was designed to evaluate the effect of pre-existing ulnar nerve instability on the surgical treatment of cubital tunnel syndrome. Researchers carried out a search with Boolean operators: “ulnar nerve” OR “cubital tunnel” AND “decompression” OR “transposition” on PubMed, Clinical Key, and CINAHL to distinguish primary studies comparing NT and SD that report pre-existing nerve instability. The primary endpoint included the impact of instability on study design. Nerve instability, patient-reported scores, and complications were the secondary endpoints. The data showed that very few studies report ulnar nerve instability, and study design is biased by ulnar nerve subluxation. Results exhibited similar symptomatic improvement for both decompressed and transposed groups with higher complication rates for transposed groups.