Table 2.

Reference standards used in the included studies.

Study	Reference standard used in the study
Abouelela et al. [16]	Basic Motor Nerve Conduction at the Tibial Nerve
Beumer et al. [17]	Diagnostic imaging and arthroscopy
de Cesar et al. [18]	MRI
DeOrio et al. [19]	MRI
Hertel et al. [21]	Stress fluoroscopy
Kinoshita et al. [20]	Electromyography
Mafulli [22]	Surgical confirmation for all subjects with the diagnosis; MRI and ultrasound in all subjects without the diagnosis
Molloy et. al. [23]	Arthroscopy
Oloff et. al. [24]	Surgical confirmation