Table 2. Summary of characteristics of studies included.
| # | Authors and year | Title | Journal | Country | Type of study | Number of patients receiving conservative treatment | Level of evidence | Funding or conflict of interest | Methodological quality assessment |
| Injections: | |||||||||
| 1 | Alblas et al, 2012 8 | Injection with corticosteroids (ultrasound guided) in patients with an ulnar neuropathy at the elbow, feasibility study | European Journal of Neurology | The Netherlands | Case series, prospective | 8 | IV | NM | High |
| 2 | Chen et al, 2020 20 | Perineural dextrose and corticosteroid injections for ulnar neuropathy at the elbow: a randomized double-blind trial | Archives of Physical Medicine & Rehabilitation | China | Case–control, prospective | 33 | III | No | High |
| 3 | Choi et al, 2015 9 | Clinical implications of real-time visualized ultrasound-guided injection for the treatment of ulnar neuropathy at the elbow: a pilot study | Annals of Rehabilitation Medicine | Korea | Caser series, prospective | 10 | IV | No | High |
| 4 | Gronbeck et al, 2021 10 | Ultrasound-guided cubital tunnel injection: a review and exploration of utility as a diagnostic aid in mild or nonclassic cubital tunnel patients | Techniques in Orthopaedics | United States | Case series, retrospective | 63 | IV | NM | High |
| 5 | Pechan and Kredba, 1980 11 | Treatment of cubital tunnel syndrome by means of local administration of cortisonoids. II. Long-term follow-up | Acta Universitatis Carolinae, Medical | Czech Republic | Case series, prospective | 14 | IV | NM | Moderate |
| 6 | Rampen et al, 2011 12 | Ultrasound-guided steroid injection to treat mild ulnar neuropathy at the elbow | Muscle & Nerve | The Netherlands | Case series, prospective | 7 | IV | NM | High |
| 7 | vanVeen et al, 2015 21 | Corticosteroid injection in patients with ulnar neuropathy at the elbow: a randomized, double-blind, placebo-controlled trial | Muscle & Nerve | The Netherlands | Case–control, prospective | 30 | III | NM | High |
| Physical therapy: | |||||||||
| 8 | Oskay et al, 2010 13 | Neurodynamic mobilization in the conservative treatment of cubital tunnel syndrome: long-term follow-up of 7 cases | Journal of Manipulative & Physiological Therapeutics | Turkey | Case series, prospective | 7 | IV | No | Moderate |
| 9 | Ozkan et al, 2015 22 | New treatment alternatives in the ulnar neuropathy at the elbow: ultrasound and low-level laser therapy | Acta Neurologica Belgica | Turkey | Case–control, prospective | 32 | III | No | High |
| Splint devices: | |||||||||
| 10 | Dellon et al, 1993 14 | Nonoperative management of cubital tunnel syndrome: an 8-year prospective study | Neurology | United States | Case series, prospective | 121 | IV | NM | High |
| 11 | Hong et al, 1996 23 | Splinting and local steroid injection for the treatment of ulnar neuropathy at the elbow: clinical and electrophysiological evaluation | Archives of Physical Medicine & Rehabilitation | United States | Case–control, prospective | 10 | III | No | High |
| 12 | Michell and Sesath, 2020 15 | Feasibility trial of treatment of ulnar neuropathy at the elbow using a specifically designed splint | JCR: Journal of Clinical Rheumatology | United Kingdom | Case series, prospective | 15 | IV | NM | Moderate |
| 13 | Seror, 1993 16 | Treatment of ulnar nerve palsy at the elbow with a night splint | Journal of Bone & Joint Surgery | France | Case series, prospective | 22 | IV | NM | High |
| 14 | Shah et al, 2013 17 | Outcomes of rigid night splinting and activity modification in the treatment of cubital tunnel syndrome | Journal of Hand Surgery | United States | Case series, prospective | 19 | IV | NM | High |
| 15 | Svernlöv et al, 2009 24 | Conservative treatment of the cubital tunnel syndrome | Journal of Hand Surgery | Sweden | Case–control, prospective | 51 | III | NM | High |
| Other: | |||||||||
| 16 | Beekman et al, 2004 25 | Ulnar neuropathy at the elbow: follow-up and prognostic factors determining outcome | Neurology | Netherlands | Case– control, prospective | NA | III | NM | High |
| 17 | Nakamichi et al, 2009 18 | Patient education for the treatment of ulnar neuropathy at the elbow | Archives of Physical Medicine & Rehabilitation | Japan | Case series, prospective | 77 | IV | No | High |
| 18 | Omejec and Podnar, 2018 26 | Long-term outcomes in patients with ulnar neuropathy at the elbow treated according to the presumed etiology | Clinical Neurophysiology | Slovenia | Case– control, prospective | 67 | III | Yes | High |
| 19 | Padua et al, 2002 19 | Natural history of ulnar entrapment at elbow | Clinical Neurophysiology | Italy | Case series, retrospective | 30 | IV | NM | High |
Abbreviations: NA, no information available; NM, not mentioned.