4.2.1. Peroneal Nerve Decompression

In 2019, Wilson et al. published the results of a retrospective study aiming to identify potential predictors of functional outcome following peroneal nerve decompression at the level of the fibular head. The working status of the included patients was also evaluated in regard to a possible correlation with functional outcome. However, no statistically significant correlation could be identified [49].

#### 4.2.2. Ulnar Nerve Decompression

Gaspar's group aimed to evaluate predictors for revision surgery both following in situ ulnar nerve decompression [50] as well as medial epicondylectomy [51] in patients with cubital tunnel syndrome. While revision surgery following in situ decompression of the ulnar nerve was required in 3.2% of the analyzed 216 cases, patient age < 50 years was the only significant predictor of revision surgery. Neither gender nor workers 'compensation status had any predictive significance. In regard to patients who underwent medial epicondylectomy, 13.3% of the 82 cases required revision surgery. In accordance with the aforementioned study, younger age was identified as predictive factor. Workers' compensation claims, lesser disease severity, and preoperative opioid use were identified as additional significant predictors.
