Surgical learning curve in reverse shoulder arthroplasty for proximal humerus fractures.

42 , 44 A learning curve can be determined when the cumulative sum curve indicates a downward trend in the first phase, also called learning phase, while an increasing trend can be determined in a secondary phase, also called consolidation phase.

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Results were visualized using scatter plots to assess whether a clear trend in the effect of the cumulative number of surgeries on the outcome measures was present.

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