Brara HS, Royse KE, Fennessy J, Harris JE, Guppy KH (2023). Lateral Mass Screws Versus Pedicle Screws at C7: Reoperation Rates for Operative Adjacent Segment Disease and Nonunion in Posterior Cervical Fusion Spine, 48 (13): 920-929.
Guppy KH, Royse KE, Fennessy JH, Norheim EP, Harris JE, Brara HS (2022). No difference in reoperation rates for nonunions (operative nonunions) in posterior cervical fusions stopping at C7 versus T1/2: a cohort of 875 patients J Neurosurg Spine, 36 (): 979-985.
Guppy KH, Royse KE, Fennessy JH, Norheim EP, Harris JE, Brara HS (2022). No Difference in Reoperation Rates for Adjacent Segment Disease (Operative Adjacent Segment Disease) in Posterior Cervical Fusions Stopping at C7 Versus T1/T2: A Cohort of 875 Patients-Part 1 Spine, 47 (3): 261-268.
Kuo CC, Royse KE, Prentice HA, Harris JE, Guppy KH (2022). Are Octogenarians at Higher Risk of Complications After Elective Lumbar Spinal Fusion Surgery? Analysis of a Cohort of 7,880 patients from the Kaiser Permanente Spine Registry Spine, 47 (24): 1719-1727.
Hirt D, Prentice HA, Harris JE, Paxton EW, Alexander J, Nagasawa DT, Khosla D, Kurtz SM (2021). Do PEEK Rods for Posterior Instrumented Fusion in the Lumbar Spine Reduce the Risk of Adjacent Segment Disease? International Journal of Spine Surgery, 15 (2): 251-258.
Norheim EP, Royse KE, Brara HS, Moller DJ, Suen PW, Rahman SU, Harris JE, Guppy KH (2021). PLF+PS or ALIF+PS: which has a lower operative nonunion rate? Analysis of a cohort of 2,061 patients from a National Spine Registry The Spine Journal, 21 (7): 1118-1125.
Guppy KH, Royse KE, Norheim EP, Harris JE, Brara HS (2021). PLF Versus PLIF and the Fate of L5-S1: Analysis of Operative Nonunion Rates Among 3,065 Patients with Lumbar Fusions from a Regional Spine Registry Spine, 46 (10): E584-E593.
Guppy KH, Chan PH, Prentice HA, Norheim EP, Harris JE, Brara HS (2020). Does the use of preoperative bisphosphonates in patients with osteopenia and osteoporosis affect lumbar fusion rates? Analysis from a national spine registry Neurosurgical Focus, 49 (2): .
Guppy KH, Royse KE, Norheim EP, Moller DJ, Suen PW, Rahman SU, Harris JE, Brara HS (2020). Operative Nonunion Rates in Posterolateral Lumbar Fusions: Analysis of a Cohort of 2591 Patients from a National Spine Registry World Neurosurgery, 145 (): E131-E140.
Guppy KH, Harris J, Bernbeck JA, Brara HS (2019). Impact of Quality Assessment on Clinical Practice, Kaiser Permanente Quality Spine Care, (): 315-339.
Aguilar D, Brara HS, Rahman S, Harris J, Prentice HA, Guppy KH (2019). Exclusion criteria for dysphagia for outpatient single-level anterior cervical discectomy and fusion using inpatient data from a spine registry Clin Neurol Neurosurg, 180 (): 28-33.
Guppy KH, Lee DJ, Harris J, Brara HS (2018). Reoperation for Symptomatic Nonunions in Atlantoaxial (C1-C2) Fusions with and without Bone Morphogenetic Protein (BMP): A Cohort of 108 Patients with > 2-year Follow-up World Neurosurgery, 121 (): E458-E466.
Bains RS, Mitsunaga L, Kardile M, Chen Y, Guppy K, Harris J, Paxton E (2017). Bone morphogenetic protein (BMP-2) usage and cancer correlation: An analysis of 10,416 spine fusion patients from a multi-center spine registry J Clinical Neuroscience, 43 (): 214-219.
Bains RS, Kardile M, Mitsunaga L, Chen Y, Harris J, Paxton E, Majid K (2017). Does chronic kidney disease affect the mortality rate in patients undergoing spine surgery? J Clinical Neuroscience, 43 (): 208-213.
Akins PT, Inacio MC, Bernbeck JA, Harris J, Chen YX, Prentice HA, Guppy KH (2017). Do Obese and Extremely Obese Patients Lose Weight After Lumbar Spine Fusions? Analysis of a Cohort of 7303 Patients From the Kaiser National Spine Registry Spine, 43 (1): 22-27.
Flippin M, Harris J, Paxton EW, Prentice HA, Fithian DC, Ward SR, Gombatto SP (2017). Effect of body mass index on patient outcomes of surgical intervention for the lumbar spine Journal of Spine Surgery, 3 (3): 349-357.
Guppy KH, Brara HS, Bernbeck JA (2016). Occipitocervical Fusions in Elderly Patients: Mortality and Reoperation Rates from a National Spine Registry World Neurosurgery, 86 (): 161-167.
Guppy KH, Harris J, Chen J, Paxton EW, Alvarez JL, Bernbeck JA (2016). Reoperation rates for symptomatic nonunions in posterior cervical (subaxial) fusions with and without bone morphogenetic protein in a cohort of 1158 patients J Neurosurg Spine, 24 (4): 556-564.
Guppy KH, Harris J, Chen J, Paxton EW, Bernbeck JA (2016). Reoperation rates for symptomatic nonunions in posterior cervicothoracic fusions with and without bone morphogenetic protein in a cohort of 450 patients J Neurosurg Spine, 25 (3): 309-317.
Akins P, Harris J, Alvarez J, Chen Y, Paxton E, Bernbeck J, Guppy K (2015). Risk Factors Associated With 30-day Readmissions After Instrumented Spine Surgery in 14,939 Patients: 30-day Readmissions After Instrumented Spine Surgery Spine (Phila Pa 1976), 40 (13): 1022-1032.
Guppy KH, Harris J, Paxton LW, Alvarex JL, Bernbeck JA (2015). Reoperation Rates for Symptomatic Nonunions in Anterior Cervical Fusions from a National Spine Registry Spine, 40 (20): 1632-1637.
Guppy K, Paxton E, Harris J, Alvarez J, Bernbeck J (2014). Does Bone Morphogenetic Protein Change the Operative Nonunion Rates in Spine Fusions? Spine (Phila Pa 1976), 39 (22): 1831-1839.