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Table 2 Kirkaldy-Willis Criteria: the modified criteria for functional outcome

From: Comparison of the PEEK cage and an autologous cage made from the lumbar spinous process and laminae in posterior lumbar interbody fusion

  The modified Kirkaldy-Willis Criteria
Grade Description
Excellent The patient has returned to their normal work and other activities with little or no complaint.
Good The patient has returned to their normal work but may have some restriction in other activities, and may on occasion after heavy work have recurrent back pain requiring a rest for a few days.
Fair The patient has to reduce their working capacity, taking a lighter job or work part-time, and may occasionally have recurrence of pain requiring absence from work for one to two weeks, once or twice a year.
Poor The patient does not return to work.