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Review Question - QID 217400

QID 217400 (Type "217400" in App Search)
A 72-year-old female with a history of L2-S1 posterior instrumented fusion presents with increasing back pain, difficulty with distance ambulation, and feeling "hunched over." The patient is found to have an SVA +17 cm, LL 23°, and evidence of PJK at the L1-2 disc space. The treating surgeon decides to perform a revision posterior instrumented fusion. When discussing radiographic parameters, the surgeon mentions a T1 pelvic angle. Which of the following is true regarding this radiographic parameter?