PurposeThis study aimed to evaluate the effects and interactions of training level and different joints on the outcomes of cadaveric arthroscopic training courses for orthopaedic residents.MethodsThis prospective study enrolled 16 orthopaedic residents who voluntarily participated in a cadaveric training programme involving the shoulder, elbow, wrist, knee and ankle joints. Outcomes were quantitatively assessed using task‐specific checklists and the Arthroscopic Surgery Skill Evaluation Tool. Two‐way analysis of variance (ANOVA) was conducted to determine the significance of the interactions between joint and years of training.ResultsResident scores significantly increased after the dedicated lectures in all five joints (p = 0.003 for the shoulder module, p < 0.001 for the other joints). Two‐way ANOVA revealed that the progress made after the dedicated lectures was significantly impacted by the joint (p = 0.006) and training level × joint interaction (p = 0.005) but not by the training level (p = 0.47). The simple effect of the joint was examined using Sidak's multiple comparison test. Among junior residents, the dedicated lectures resulted in more substantial progress in elbow and wrist arthroscopy when compared to shoulder arthroscopy (p = 0.020 and p = 0.043, respectively).ConclusionsThe results suggest that, in cadaveric arthroscopic training courses for orthopaedic residents, training outcomes are primarily impacted by the specific joint being trained rather than the training level. Specifically, junior residents demonstrated greater improvement with training in procedures that are less commonly encountered during on‐the‐job training, such as elbow and wrist arthroscopy.Clinical RelevanceThese findings suggest the need to prioritise wrist and elbow arthroscopic training for junior residents to optimise educational outcomes.Level of EvidenceLevel III.