Wouldn't you expect to see that reflected in outcomes? TFA mentions that the only studied country with more avoidable mortality than the US was Mexico. If you aren't seeing it, maybe its not as big a problem as all the people who cannot afford any access to care at all while the country spends more per-person.
Oddly, the country with the expensive ineffective healthcare with lower wait times (citation needed) is also the one that doesn’t have guaranteed paid sick leave and other facilities that would make wait times less of a factor.
There’s not (typically) a regular measure of how much pain and disability a patient suffers while waiting for a hip replacement. It certainly would only show up in mortality statistics massively attenuated.