Keck School Faculty

Robert M Kay, MD
Robert M Kay, MD
Professor of Orthopaedic Surgery (Clinical Scholar)
Pediatric Orthopaedic Surgery
CHL Mail Stop 69 Off Campus Los Angeles
Dr. Kay received his undergraduate degree from Harvard College and his medical degree from The Johns Hopkins University School of Medicine. He completed his residency in orthopaedic surgery at University of California Los Angeles and a fellowship in pediatric orthopaedics at Atlanta Scottish Rite Childrens Medical Center. Dr. Kay has published over 70 peer-reviewed articles and numerous book chapters and is active in several organizations including the American Academy of Orthopaedic Surgeons, Pediatric Orthopaedic Society of North America, American Academy of Cerebral Palsy and Developmental Medicine and the Gait and Clinical Movement Analysis Society. Dr. Kay has been the director of the Motion Analysis Laboratory since 1997.

Percutaneous Hamstring Lengthening Surgery is as Effective as Open Lengthening in Children With Cerebral Palsy J Pediatr Orthop. 2019 Aug; 39(7):366-371. . View in PubMed

Comparison of plate and screw constructs versus screws only for anterior distal femoral hemiepiphysiodesis in children J Pediatr Orthop B. 2019 Jul 29. . View in PubMed

Impact of tranexamic acid use on blood loss and transfusion rates following femoral varus derotational osteotomy in children with cerebral palsy J Child Orthop. 2019 Apr 01; 13(2):190-195. . View in PubMed

Pre-operative hamstring length and velocity do not explain the reduced effectiveness of repeat hamstring lengthening in children with cerebral palsy and crouch gait Gait Posture. 2019 02; 68:323-328. . View in PubMed

Pre-operative hamstring length and velocity do not explain the reduced effectiveness of repeat hamstring lengthening in children with cerebral palsy and crouch gait Gait Posture. 2018 Nov 28; 68:323-328. . View in PubMed

Outcomes of salvage hip surgery in children with cerebral palsy J Pediatr Orthop B. 2018 Oct 15. . View in PubMed

Foam Padding in Postoperative Lower Extremity Casting: An Inexpensive Way to Protect Patients J Pediatr Orthop. 2018 Sep; 38(8):e470-e474. . View in PubMed

Foam Padding in Postoperative Lower Extremity Casting: An Inexpensive Way to Protect Patients J Pediatr Orthop. 2018 Jun 20. . View in PubMed

Prevalence of specific gait abnormalities in children with cerebral palsy revisited: influence of age, prior surgery, and Gross Motor Function Classification System level Dev Med Child Neurol. 2017 01; 59(1):79-88. . View in PubMed

Percutaneous Hamstring Lengthening Surgery is as Effective as Open Lengthening in Children With Cerebral Palsy J Pediatr Orthop. 2016 Dec 22. . View in PubMed

Accessory Navicular is Associated With Wider and More Prominent Navicular Bone in Pediatric Patients by Radiographic Measurement J Pediatr Orthop. 2016 Jul-Aug; 36(5):521-5. . View in PubMed

Anterior Percutaneous Hemiepiphysiodesis of the Distal Aspect of the Femur: A New Technique: A Case Report JBJS Case Connect. 2015 Oct-Dec; 5(4):e95. . View in PubMed

Knee Pain and Patellofemoral Symptoms in Patients With Cerebral Palsy J Pediatr Orthop. 2015 Jul-Aug; 35(5):519-22. . View in PubMed

Long-term ambulatory change after lower extremity orthopaedic surgery in children with cerebral palsy: a retrospective review J Pediatr Orthop. 2015 Apr-May; 35(3):285-9. . View in PubMed

Foam padding in casts accommodates soft tissue swelling and provides circumferential strength after fixation of supracondylar humerus fractures J Pediatr Orthop. 2015 Jan; 35(1):24-7. . View in PubMed

A line drawn along the radial shaft misses the capitellum in 16% of radiographs of normal elbows J Pediatr Orthop. 2014 Dec; 34(8):763-7. . View in PubMed

Assessment of human exposures to animal vaccines using poison control records, 2000-2009 Zoonoses Public Health. 2014 May; 61(3):175-80. . View in PubMed

Heterotopic Ossification Excision Improves Kinetic and Kinematic Gait Parameters as Demonstrated by Computerized Motion Analysis: A Case Report JBJS Case Connect. 2013 Nov 13; 3(4 Suppl 3):1-7. . View in PubMed

Heterotopic Ossification Excision Improves Kinetic and Kinematic Gait Parameters as Demonstrated by Computerized Motion Analysis: A Case Report JBJS Case Connect. 2013 Oct 23; 3(4 Suppl 2):e1051-7. . View in PubMed

Impact of gait analysis on correction of excessive hip internal rotation in ambulatory children with cerebral palsy: a randomized controlled trial Dev Med Child Neurol. 2013 Oct; 55(10):919-25. . View in PubMed

Outcomes of lower extremity orthopedic surgery in ambulatory children with cerebral palsy with and without gait analysis: results of a randomized controlled trial Gait Posture. 2013 Jun; 38(2):236-41. . View in PubMed

Differences in implementation of gait analysis recommendations based on affiliation with a gait laboratory Gait Posture. 2013 Feb; 37(2):206-9. . View in PubMed

Orthopedic surgeons are less likely to see children now for fracture care compared with 10 years ago J Pediatr. 2012 Mar; 160(3):505-7. . View in PubMed

Perioperative ketorolac use in children undergoing lower extremity osteotomies J Pediatr Orthop. 2011 Oct-Nov; 31(7):783-6. . View in PubMed

Cerebral palsy: clinical care and neurological rehabilitation Lancet Neurol. 2011 Sep; 10(9):844-52. . View in PubMed

A new surgical technique for the treatment of supracondylar humerus fracture malunions in children J Child Orthop. 2011 Aug; 5(4):305-12. . View in PubMed

Influence of gait analysis on decision-making for lower extremity orthopaedic surgery: Baseline data from a randomized controlled trial Gait Posture. 2011 Jul; 34(3):364-9. . View in PubMed

Bone density and size in ambulatory children with cerebral palsy Dev Med Child Neurol. 2011 Feb; 53(2):137-41. . View in PubMed

Orthopaedic issues in children and adolescents with central nervous system tumors J Pediatr Rehabil Med. 2011; 4(1):71-8. . View in PubMed

Complications of ketorolac use in children undergoing operative fracture care J Pediatr Orthop. 2010 Oct-Nov; 30(7):655-8. . View in PubMed

Classification systems in cerebral palsy Orthop Clin North Am. 2010 Oct; 41(4):457-67. . View in PubMed

Effect of high-frequency, low-magnitude vibration on bone and muscle in children with cerebral palsy J Pediatr Orthop. 2010 Oct-Nov; 30(7):732-8. . View in PubMed

Excessive hip flexion during gait in patients with static encephalopathy: an examination of contributing factors J Pediatr Orthop. 2010 Sep; 30(6):562-7. . View in PubMed

Achilles tendon length and medial gastrocnemius architecture in children with cerebral palsy and equinus gait J Pediatr Orthop. 2010 Jul-Aug; 30(5):479-84. . View in PubMed

Development of calcaneal gait without prior triceps surae lengthening: an examination of predictive factors J Pediatr Orthop. 2010 Apr-May; 30(3):240-3. . View in PubMed

Distal humerus osteotomy for supracondylar fracture malunion in children: a study of perioperative complications Am J Orthop (Belle Mead NJ). 2010 Jan; 39(1):22-5. . View in PubMed

Osteoporosis management: a perspective based on bisphosphonate data from randomised clinical trials and observational databases Int J Clin Pract. 2009 Dec; 63(12):1792-804. . View in PubMed

A new classification system predictive of complications in surgically treated pediatric humeral lateral condyle fractures J Pediatr Orthop. 2009 Sep; 29(6):602-5. . View in PubMed

Effects of preoperative gait analysis on costs and amount of surgery J Pediatr Orthop. 2009 Sep; 29(6):558-63. . View in PubMed

Malignant peripheral nerve sheath tumor of the lumbar spine Am J Orthop (Belle Mead NJ). 2009 May; 38(5):E89-92. . View in PubMed

Predictors of outcome of distal rectus femoris transfer surgery in ambulatory children with cerebral palsy J Pediatr Orthop B. 2009 Mar; 18(2):58-62. . View in PubMed

Complications with flexible nailing of femur fractures more than double with child obesity and weight >50 kg J Child Orthop. 2009 Feb; 3(1):53-8. . View in PubMed

Delaying treatment of supracondylar fractures in children: has the pendulum swung too far? J Bone Joint Surg Br. 2008 Sep; 90(9):1228-33.. View in PubMed

Incidence of occult fracture in children with acute ankle injuries J Pediatr Orthop. 2008 Jul-Aug; 28(5):500-1. . View in PubMed

"Kinematic and kinetic evaluation of the ankle joint before and after tendo Achilles lengthening in patients with spastic diplegia" J Pediatr Orthop. 2008 Apr-May; 28(3):392. . View in PubMed

Concurrent and discriminant validity of Spanish language instruments for measuring functional health status J Pediatr Orthop. 2008 Mar; 28(2):199-212. . View in PubMed

How safe is the operative treatment of Gartland type 2 supracondylar humerus fractures in children? J Pediatr Orthop. 2008 Mar; 28(2):139-41.. View in PubMed

Abduction pillow immobilization following hip surgery: a welcome alternative for selected patients J Child Orthop. 2007 Nov; 1(5):299-305. . View in PubMed

Gillette Gait Index as a gait analysis summary measure: comparison with qualitative visual assessments of overall gait J Pediatr Orthop. 2007 Oct-Nov; 27(7):765-8. . View in PubMed

Compartment syndrome of the thigh in an infant: a case report J Orthop Trauma. 2007 Sep; 21(8):587-90. . View in PubMed

Complete division of the radial nerve associated with a closed fracture of the humeral shaft in a child J Bone Joint Surg Br. 2007 Jun; 89(6):821-4. . View in PubMed

Agreement among three instruments for measuring functional health status and quality of life in pediatric orthopaedics J Pediatr Orthop. 2007 Mar; 27(2):233-40. . View in PubMed

Insurance status and delay in orthotic treatment in children J Pediatr Orthop. 2007 Jan-Feb; 27(1):94-7. . View in PubMed

Causes of intoeing gait in children with cerebral palsy J Bone Joint Surg Am. 2006 Oct; 88(10):2175-80. . View in PubMed

Back pain and backpacks in school children J Pediatr Orthop. 2006 May-Jun; 26(3):358-63. . View in PubMed

Access to orthopaedic care for children with medicaid versus private insurance: results of a national survey J Pediatr Orthop. 2006 May-Jun; 26(3):400-4. . View in PubMed

Pediatric polytrauma management J Pediatr Orthop. 2006 Mar-Apr; 26(2):268-77. . View in PubMed

Open fractures in childrenPrinciples of evaluation and management. J Bone Joint Surg Am. 2005 Dec; 87(12):2784-98. . View in PubMed

How closely do surgeons follow gait analysis recommendations and why? J Pediatr Orthop B. 2005 May; 14(3):202-5.. View in PubMed

Prevalence of specific gait abnormalities in children with cerebral palsy: influence of cerebral palsy subtype, age, and previous surgery J Pediatr Orthop. 2005 Jan-Feb; 25(1):79-83. . View in PubMed

Botulinum toxin as an adjunct to serial casting treatment in children with cerebral palsy J Bone Joint Surg Am. 2004 Nov; 86(11):2377-84. . View in PubMed

Botulinum toxin as an adjunct to serial casting treatment in children with cerebral palsy J Bone Joint Surg Am. 2004 Nov; 86-A(11):2377-84. . View in PubMed

Gastrocnemius and soleus lengths in cerebral palsy equinus gait--differences between children with and without static contracture and effects of gastrocnemius recession J Biomech. 2004 Sep; 37(9):1321-7. . View in PubMed

Changes in pelvic rotation after soft tissue and bony surgery in ambulatory children with cerebral palsy J Pediatr Orthop. 2004 May-Jun; 24(3):278-82. . View in PubMed

Effect of surgical delay on perioperative complications and need for open reduction in supracondylar humerus fractures in children J Pediatr Orthop. 2004 May-Jun; 24(3):245-8. . View in PubMed

Lateral-entry pin fixation in the management of supracondylar fractures in children J Bone Joint Surg Am. 2004 Apr; 86-A(4):702-7. . View in PubMed

Lateral-entry pin fixation in the management of supracondylar fractures in children J Bone Joint Surg Am. 2004 Apr; 86(4):702-7. . View in PubMed

Outcome of gastrocnemius recession and tendo-achilles lengthening in ambulatory children with cerebral palsy J Pediatr Orthop B. 2004 Mar; 13(2):92-8. . View in PubMed

Predictive value of the Duncan-Ely test in distal rectus femoris transfer J Pediatr Orthop. 2004 Jan-Feb; 24(1):59-62. . View in PubMed

Late extensor pollicis longus rupture following displaced distal radius and ulna fractures in a child J Orthop Trauma. 2004 Jan; 18(1):53-6. . View in PubMed

Childhood diskitis J Am Acad Orthop Surg. 2003 Nov-Dec; 11(6):413-20. . View in PubMed

Delayed neurologic injury due to bone graft migration into the spinal canal following scoliosis surgery Orthopedics. 2003 May; 26(5):515-6. . View in PubMed

Comparison of proximal and distal rotational femoral osteotomy in children with cerebral palsy J Pediatr Orthop. 2003 Mar-Apr; 23(2):150-4. . View in PubMed

Fracture stability after pinning of displaced supracondylar distal humerus fractures in children J Pediatr Orthop. 2002 Sep-Oct; 22(5):697; author reply 697-8. . View in PubMed

Outcome of medial versus combined medial and lateral hamstring lengthening surgery in cerebral palsy J Pediatr Orthop. 2002 Mar-Apr; 22(2):169-72. . View in PubMed

Growth arrest of the distal radius following a metaphyseal fracture: case report and review of the literature J Pediatr Orthop B. 2002 Jan; 11(1):89-92. . View in PubMed

Bilateral hip dislocations in a father and son with Ehlers-Danlos syndrome Orthopedics. 2001 Dec; 24(12):1165-6. . View in PubMed

Prediction of postoperative gait velocity in cerebral palsy J Pediatr Orthop B. 2001 Oct; 10(4):275-8. . View in PubMed

Pediatric foot fractures: evaluation and treatment J Am Acad Orthop Surg. 2001 Sep-Oct; 9(5):308-19. . View in PubMed

Pediatric ankle fractures: evaluation and treatment J Am Acad Orthop Surg. 2001 Jul-Aug; 9(4):268-78. . View in PubMed

Access to orthopedic care for children with medicaid versus private insurance in California Pediatrics. 2001 Jun; 107(6):1405-8. . View in PubMed

Operative treatment of supracondylar fractures of the humerus in childrenThe consequences of pin placement. J Bone Joint Surg Am. 2001 May; 83-A(5):735-40. . View in PubMed

Operative treatment of supracondylar fractures of the humerus in childrenThe consequences of pin placement. J Bone Joint Surg Am. 2001 May; 83(5):735-40. . View in PubMed

Elbow aspiration and arthrogram: an alternative method Am J Orthop (Belle Mead NJ). 2001 Mar; 30(3):256. . View in PubMed

Ischaemic myelopathy presenting as Guillain-Barré syndrome Int J Clin Pract. 2000 Jun; 54(5):340-1. . View in PubMed

Impact of postoperative gait analysis on orthopaedic care Clin Orthop Relat Res. 2000 May; (374):259-64. . View in PubMed

A simplified valgus osteotomy of the proximal femur in children J Pediatr Orthop B. 2000 Apr; 9(2):114-8. . View in PubMed

Dysplasia epiphysealis hemimelica of the acetabulumA report of two cases. J Bone Joint Surg Am. 2000 Mar; 82(3):409-14. . View in PubMed

Effect of delay of surgical treatment on rate of infection in open fractures in children J Pediatr Orthop. 2000 Jan-Feb; 20(1):19-22. . View in PubMed

Publication of abstracts submitted to the annual meeting of the Pediatric Orthopaedic Society of North America J Pediatr Orthop. 2000 Jan-Feb; 20(1):2-6. . View in PubMed

Outcome of hamstring lengthening and distal rectus femoris transfer surgery J Pediatr Orthop B. 1999 Apr; 8(2):75-9. . View in PubMed

Bilateral proximal radial and scaphoid fractures in a child J Hand Surg Br. 1999 Apr; 24(2):255-7. . View in PubMed

Late metachronous involvement of the contralateral hip in Legg-Calvé-Perthes disease J Pediatr Orthop. 1998 Nov-Dec; 18(6):807-10. . View in PubMed

Late presentation of a Monteggia fracture Orthopedics. 1996 Oct; 19(10):895-7. . View in PubMed

Osteosarcoma and Ewing's sarcoma in a retinoblastoma patient Clin Orthop Relat Res. 1996 Feb; (323):284-7. . View in PubMed

Long-term durability of cemented primary total hip arthroplasty J Arthroplasty. 1995 Nov; 10 Suppl:S29-38. . View in PubMed

Inter- and intraobserver variation in staging patients with proven avascular necrosis of the hip Clin Orthop Relat Res. 1994 Oct; (307):124-9. . View in PubMed

Heterotopic ossification prophylaxis following operative treatment of acetabular fracture Clin Orthop Relat Res. 1994 Aug; (305):88-95. . View in PubMed

Metastatic hepatocellular carcinoma to bone in a liver transplant patientA case report. Clin Orthop Relat Res. 1994 Jun; (303):237-41. . View in PubMed

Hydroxyapatite-coated distal femoral replacementsPreliminary results. Clin Orthop Relat Res. 1994 May; (302):92-100. . View in PubMed

EMLA cream reduces the pain of venepuncture in children Eur J Anaesthesiol. 1987 Nov; 4(6):441-8. . View in PubMed

Cutaneous ureterostomy in children--long-term followup J Urol. 1985 Sep; 134(3):518-20. . View in PubMed

Growth of long term survivors of childhood malignancy Acta Paediatr Scand. 1985 May; 74(3):438-41. . View in PubMed

[Indications for the surgical correction of patients with transposition of the great arteries associated with an interventricular defectAnalysis of 98 cases operated on using the Mustard technic]. G Ital Cardiol. 1983 Dec; 13(12):380-7. . View in PubMed

Complications of posterior iliac crest bone grafting in spine surgery in children Spine (Phila Pa 1976). 2000 Sep 15; 25(18):2400-2. . View in PubMed

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