“…6 , since 2011, there was a noteworthy decline in HA as opposed to RSA, potentially associated with unpredictable motion and unsatisfactory outcomes of HA. 9 , 11 , 13 , 16 , 18 , 28 , 37 Moreover, the ICD-9 code for RSA was only introduced in 2011. Before that time, RSAs were probably codified as TSA, as found in our validation sample.…”