2. Smith JS, Lafage V, Shaffrey CI, et al. Outcomes of operative and nonoperative treatment for adult spinal deformity: a prospective, multicenter, propensity-matched cohort assessment with minimum 2-year follow-up. Neurosurgery 2016;78:851-61.
3. Glassman SD, Schwab FJ, Bridwell KH, et al. The selection of operative versus nonoperative treatment in patients with adult scoliosis. Spine (Phila Pa 1976) 2007;32:93-7.
4. DeWald CJ, Stanley T. Instrumentation-related complications of multilevel fusions for adult spinal deformity patients over age 65: surgical considerations and treatment options in patients with poor bone quality. Spine (Phila Pa 1976) 2006;31(19 Suppl):S144-51.
5. Kim YJ, Bridwell KH, Lenke LG, et al. Proximal junctional kyphosis in adult spinal deformity after segmental posterior spinal instrumentation and fusion: minimum five-year follow-up. Spine (Phila Pa 1976) 2008;33:2179-84.
6. Yagi M, King A, Boachie-Adjei O. Incidence, risk factors and classification of proximal junctional kyphosis: surgical outcomes review of adult idiopathic scoliosis. Spine (Phila Pa 1976) 2011;36:E60-8.
7. Lau D, Clark AJ, Scheer JK, et al. Proximal junctional kyphosis and failure after spinal deformity surgery: a systematic review of the literature as a background to classification development. Spine (Phila Pa 1976) 2014;39:2093-102.
8. Yagi M, Rahm M, Gaines R, et al. Characterization and surgical outcomes of proximal junctional failure (PJF) in surgically treated adult spine deformity patients. Spine (Phila Pa 1976) 2014;39:E607-14.
10. Shlobin NA, Le N, Scheer JK, et al. State of the evidence for proximal junctional kyphosis prevention in adult spinal deformity surgery: a systematic review of current literature. World Neurosurg 2022;161:179-89.e1.
12. Maruo K, Ha Y, Inoue S, et al. Predictive factors for proximal junctional kyphosis in long fusions to the sacrum in adult spinal deformity. Spine (Phila Pa 1976) 2013;38:E1469-76.
13. Glattes RC, Bridwell KH, Lenke LG, et al. Proximal junctional kyphosis in adult spinal deformity following long instrumented posterior spinal fusion: incidence, outcomes, and risk factor analysis. Spine (Phila Pa 1976) 2005;30:1643-9.
14. Lovecchio F, Lafage R, Line B, et al. Optimizing the definition of proximal junctional kyphosis: a sensitivity analysis. Spine (Phila Pa 1976) 2023;48:414-20.
15. Diebo BG, Shah NV, Stroud SG, et al. Realignment surgery in adult spinal deformity:prevalence and risk factors for proximal junctional kyphosis. Orthopade 2018;47:301-9.
16. Duan PG, Mummaneni PV, Rivera J, et al. The association between lower Hounsfield units of the upper instrumented vertebra and proximal junctional kyphosis in adult spinal deformity surgery with a minimum 2-year follow-up. Neurosurg Focus 2020;49:E7.
17. Hart RA, Prendergast MA, Roberts WG, et al. Proximal junctional acute collapse cranial to multi-level lumbar fusion: a cost analysis of prophylactic vertebral augmentation. Spine J 2008;8:875-81.
18. Yagi M, Hosogane N, Okada E, et al. Factors affecting the postoperative progression of thoracic kyphosis in surgically treated adult patient with lumbar degenerative scoliosis. Spine (Phila Pa 1976) 2014;39:E521-8.
19. Martin CT, Skolasky RL, Mohamed AS, et al. Preliminary results of the effect of prophylactic vertebroplasty on the incidence of proximal junctional complications after posterior spinal fusion to the low thoracic spine. Spine Deform 2013;1:132-8.
20. Chanbour H, Chen JW, Vaughan WE, et al. Which bone mineral density measure offers a more reliable prediction of mechanical complications in adult spinal deformity surgery: Hounsfield units or DEXA scan? World Neurosurg 2023 Aug;3:S1878-8750(23)01088-4. doi: 10.1016/j.wneu.2023.07.140. [Epub].
21. Park SJ, Lee CS, Park JS, et al. Does the amount of correction of sagittal deformity really promote proximal junctional kyphosis? Multivariate analyses according to uppermost instrumented vertebra levels. World Neurosurg 2023 Jun;27:S1878-8750(23)00878-1. doi: 10.1016/j.wneu.2023.06.095. [Epub].
25. Rasouligandomani M, Del Arco A, Pellis EF, et al. Proximal junction failure in spine surgery: integrating geometrical and biomechanical global descriptors improves GAP scorebased assessment. Spine (Phila Pa 1976) 2023;48:1072-81.
26. Hallager DW, Hansen LV, Dragsted CR, et al. A comprehensive analysis of the SRS-Schwab adult spinal deformity classification and confounding variables: a prospective, non-US cross-sectional study in 292 patients. Spine (Phila Pa 1976) 2016;41:E589-97.
27. Chen JW, McCandless MG, Bhandarkar AR, et al. The association between bone mineral density and proximal junctional kyphosis in adult spinal deformity: a systematic review and meta-analysis. J Neurosurg Spine 2023;39:82-91.
32. Mika AP, Mesfin A, Rubery PT, et al. Proximal junctional kyphosis: a pediatric and adult spinal deformity surgery dilemma. JBJS Rev 2019;7:e4.
33. Hostin R, McCarthy I, O'Brien M, et al. Incidence, mode, and location of acute proximal junctional failures after surgical treatment of adult spinal deformity. Spine (Phila Pa 1976) 2013;38:1008-15.
34. Terran J, Schwab F, Shaffrey CI, et al. The SRS-Schwab adult spinal deformity classification: assessment and clinical correlations based on a prospective operative and nonoperative cohort. Neurosurgery 2013;73:559-68.
35. Lafage R, Schwab F, Glassman S, et al. Age-adjusted alignment goals have the potential to reduce PJK. Spine (Phila Pa 1976) 2017;42:1275-82.
36. Yilgor C, Sogunmez N, Boissiere L, et al. Global alignment and proportion (GAP) score: development and validation of a new method of analyzing spinopelvic alignment to predict mechanical complications after adult spinal deformity surgery. J Bone Joint Surg Am 2017;99:1661-72.
37. Yagi M, Daimon K, Hosogane N, et al. Predictive probability of the global alignment and proportion score for the development of mechanical failure following adult spinal deformity surgery in Asian patients. Spine (Phila Pa 1976) 2021;46:E80-6.
38. Park SJ, Lee CS, Kang BJ, et al. Validation of age-adjusted ideal sagittal alignment in terms of proximal junctional failure and clinical outcomes in adult spinal deformity. Spine (Phila Pa 1976) 2022;47:1737-45.
41. Yagi M, Fujita N, Tsuji O, et al. Low bone-mineral density is a significant risk for proximal junctional failure after surgical correction of adult spinal deformity: a propensity scorematched analysis. Spine (Phila Pa 1976) 2018;43:485-91.
42. Kuo CC, Soliman MAR, Aguirre AO, et al. Vertebral bone quality score independently predicts proximal junctional kyphosis and/or failure after adult spinal deformity surgery. Neurosurgery 2023;92:945-54.
43. Mikula AL, Lakomkin N, Pennington Z, et al. Association between lower Hounsfield units and proximal junctional kyphosis and failure at the upper thoracic spine. J Neurosurg Spine 2022 May;13:1-9. doi: 10.3171/2022.3.SPINE22197. [Epub].
45. Babu JM, Wang KY, Jami M, et al. Sarcopenia as a risk factor for complications following pedicle subtraction osteotomy. Clin Spine Surg 2023;36:190-4.
47. Im SK, Lee JH, Kang KC, et al. Proximal junctional kyphosis in degenerative sagittal deformity after under- and overcorrection of lumbar lordosis: does overcorrection of lumbar lordosis instigate PJK? Spine (Phila Pa 1976) 2020;45:E933-42.
49. Theologis AA, Miller L, Callahan M, et al. Proximal junctional kyphosis in primary adult spinal deformity surgery: evaluation of 20 degrees as a critical angle. Neurosurgery 2018;82:710-6.
51. Yagi M, Ohne H, Konomi T, et al. Teriparatide improves volumetric bone mineral density and fine bone structure in the UIV+1 vertebra, and reduces bone failure type PJK after surgery for adult spinal deformity. Osteoporos Int 2016;27:34.
52. Ebata S, Takahashi J, Hasegawa T, et al. Role of weekly teriparatide administration in osseous union enhancement within six months after posterior or transforaminal lumbar interbody fusion for osteoporosis-associated lumbar degenerative disorders: a multicenter, prospective randomized study. J Bone Joint Surg Am 2017;99:365-72.
53. Ohtori S, Inoue G, Orita S, et al. Comparison of teriparatide and bisphosphonate treatment to reduce pedicle screw loosening after lumbar spinal fusion surgery in postmenopausal women with osteoporosis from a bone quality perspective. Spine (Phila Pa 1976) 2013;38:E487-92.
54. Miller PD, Hattersley G, Riis BJ, et al. Effect of abaloparatide vs placebo on new vertebral fractures in postmenopausal women with osteoporosis: a randomized clinical trial. JAMA 2016;316:722-33.
55. Cummings SR, San Martin J, McClung MR, et al. Denosumab for prevention of fractures in postmenopausal women with osteoporosis. N Engl J Med 2009;361:756-65.
56. Kendler DL, Marin F, Zerbini CAF, et al. Effects of teriparatide and risedronate on new fractures in post-menopausal women with severe osteoporosis (VERO): a multicentre, double-blind, double-dummy, randomised controlled trial. Lancet 2018;391:230-40.
58. Hassanzadeh H, Gupta S, Jain A, et al. Type of anchor at the proximal fusion level has a significant effect on the incidence of proximal junctional kyphosis and outcome in adults after long posterior spinal fusion. Spine Deform 2013;1:299-305.
59. Cahill PJ, Wang W, Asghar J, et al. The use of a transition rod may prevent proximal junctional kyphosis in the thoracic spine after scoliosis surgery: a finite element analysis. Spine (Phila Pa 1976) 2012;37:E687-95.
60. Doodkorte RJP, Vercoulen TFG, Roth AK, et al. Instrumentation techniques to prevent proximal junctional kyphosis and proximal junctional failure in adult spinal deformity correction-a systematic review of biomechanical studies. Spine J 2021;21:842-54.
61. Rahmani R, Sanda M, Sheffels E, et al. The efficacy of prophylactic vertebroplasty for preventing proximal junctional complications after spinal fusion: a systematic review. Spine J 2022;22:2050-8.
62. Raman T, Miller E, Martin CT, et al. The effect of prophylactic vertebroplasty on the incidence of proximal junctional kyphosis and proximal junctional failure following posterior spinal fusion in adult spinal deformity: a 5-year follow-up study. Spine J 2017;17:1489-98.
64. Ghobrial GM, Eichberg DG, Kolcun JPG, et al. Prophylactic vertebral cement augmentation at the uppermost instrumented vertebra and rostral adjacent vertebra for the prevention of proximal junctional kyphosis and failure following longsegment fusion for adult spinal deformity. Spine J 2017;17:1499-505.
65. Viswanathan VK, Kukreja S, Minnema AJ, et al. Prospective assessment of the safety and early outcomes of sublaminar band placement for the prevention of proximal junctional kyphosis. J Neurosurg Spine 2018;28:520-31.
66. Safaee MM, Deviren V, Dalle Ore C, et al. Ligament augmentation for prevention of proximal junctional kyphosis and proximal junctional failure in adult spinal deformity. J Neurosurg Spine 2018;28:512-9.
67. Yagi M, Suzuki S, Okada E, et al. Sublaminar tethers significantly reduce the risk of proximal junctional failure in surgery for severe adult spinal deformity: a propensity scorematched analysis. Clin Spine Surg 2022;35:E496-503.
70. Kim HJ, Wang SJ, Lafage R, et al. Recurrent proximal junctional kyphosis: incidence, risk factors, revision rates, and outcomes at 2-year minimum follow-up. Spine (Phila Pa 1976) 2020;45:E18-24.
74. Kamalapathy PN, Karhade AV, Tobert D, et al. Artificial intelligence in adult spinal deformity. Acta Neurochir Suppl 2022;134:313-8.
75. Scheer JK, Osorio JA, Smith JS, et al. Development of validated computer-based preoperative predictive model for proximal junction failure (PJF) or clinically significant PJK with 86% accuracy based on 510 ASD patients with 2-year follow-up. Spine (Phila Pa 1976) 2016;41:E1328-35.
76. Yagi M, Fujita N, Okada E, et al. Fine-tuning the predictive model for proximal junctional failure in surgically treated patients with adult spinal deformity. Spine (Phila Pa 1976) 2018;43:767-73.
79. Orosz LD, Bhatt FR, Jazini E, et al. Novel artificial intelligence algorithm: an accurate and independent measure of spinopelvic parameters. J Neurosurg Spine 2022;37:893-901.