Patient Case: A 58-year-old patient reports stiffness and ac…
Patient Case: A 58-year-old patient reports stiffness and aching in the lower back that is worse in the morning and after prolonged activity. The pain is primarily localized to the lumbar region. The patient notes difficulty standing fully upright after sitting for extended periods, and describes relief with short periods of rest. On examination, lumbar extension reproduces their symptoms, segmental mobility testing reveals hypomobility, and no centralization occurs with repeated movement testing. Neurological screening is unremarkable. Which of the following is most likely the diagnosis?
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