Using the CUSUM Test to Control the Proportion of Inadequate Open Biopsies of Musculoskeletal Tumors

Background Biopsies of musculoskeletal tumors lead to alterations in treatment in almost 20% of cases. Control charts are useful to ensure that a process is operating at a predetermined level of performance, although their use has not been demonstrated in assessing the adequacy of musculoskeletal biopsies.