Risk Factors for Proximal Junctional Kyphosis Assessment After Spinal Instrumentation (CYPHORACHI)

The surgical management of spinal deformities especially in adults is complex. The conventional surgical treatment of these deformations is a scope arthrodesis of the spine. The quality of the result depends on many variables such as the choice of the vertebrae to fuse, location and the number of implants, the type of material used or the type of correction maneuver used.

All these variables affect the surgical outcome and may be involved as a modifiable risk factor for possible postoperative complications. The study proposes to focus on the junctional kyphosis postoperative proximal (CJP or Proximal Junctional Kyphosis: PJK). Their prevalence in adults ranges from 20% to 43% depending on the series.

The radiographic definition of CJP's kyphosis with an angle> 10 ° measured from the lower plate of the proximal instrumented vertebra to the upper plate of the adjacent vertebra proximal not instrumented; this measure is being compared to the pre operative data.

Either the CJP are asymptomatic and do not require revision surgery either they are and thereby generate a revision surgery.

Several factors may potentially influence the development of the CJP. Among them, age, preoperative comorbidities, obesity, osteoporosis, lesions of the posterior elements, hybrid instrumentation, correction forces applied during surgery, sagittal balance pre and post operative degeneration joint capsules, etc. There are few studies on the identification and analysis of these risk factors; literature gives only single-center studies on small samples with a single surgical procedure. Review articles describe the incidence and risk factors of the CJP. However, the pathophysiological mechanisms of the CJP are still controversial to this day.

The aim of this study is to determine the incidence of occurrence of postoperative kyphosis proximal junctional and identify risk factors for developing this major complication of a multicenter population of scoliosis operated an extensive fusion.

Study Overview

• Status: Completed
• Conditions: Spinal Deformity
• Intervention / Treatment: Other: No intervention : descriptive study

Detailed Description

objectives:

Determine on a homogenous population of scoliosis operated for an extended fusion of 4 or more vertebrae:

• the incidence of proximal junctional kyphosis
• Modifiable risk factors and non modifiable of occurrence of CJP.
• the rate of CJP leading to revision surgery and the surgical recovery factors.

Methodology :

This is a multicenter retrospective cohort enrolling in Chapter X of the Data Protection Act and provides, as part of this research, the collection of individual data for evaluation of care and prevention practices with authorization request to the CNIL; the opinion of CCTIRS is not required in this case.

This study concerns the data of patients operated with the techniques mentioned in addition with more than 6 months back.

Patients are aware of the potential use of their data in their files for medical research through oral information provided by the doctor at the signing by the patient's consent related to the surgery and most recently contained in the Home booklet setting for patients.

Time study: 8 months Acquisition of data: KEOPS Database (declared to CNIL)

List of data to collect:

• Epidemiological data and conventional clinics.
• Background
• Questionnaires and functional scores when available. (Some patients filled out questionnaires in the prospective follow-up of results and signed an agreement on their inclusion in the Keops database.)
• Operating data
• X-rays of the entire spine from the front and side: pre-operative, post-operative and at last follow.

• Study Type: Observational
• Enrollment (Actual): 314

Contacts and Locations

Study Locations

• France
  • Ile-de-France
    • Paris, Ile-de-France, France, 75014
      • Groupe hospitalier Paris saint Joseph

Participation Criteria

Eligibility Criteria

• Ages Eligible for Study: 40 years and older (ADULT, OLDER_ADULT)
• Accepts Healthy Volunteers: No
• Genders Eligible for Study: All

• Sampling Method: Non-Probability Sample

Study Population

Patients admitted to Saint Joseph Hospital

Description

Inclusion Criteria:

• age over 40 years
• Decline minimum 6 months
• Scoliosis degenerative etiology, neurological and idiopathic.
• segmental instrumentation over 3 levels (4 vertebrae) in the lumbar area.
• Patients operated on for the 1st time.

Exclusion Criteria:

• Lumbar spinal surgery or history of chest instrumented
• Etiology post traumatic tumor
• non-segmental instrumentation (Harrington type)
• segmental instrumentation on less than 3 levels.
• Pre and unreadable or missing postoperative radiograph
• Decline <6 months

Study Plan

How is the study designed?

What is the study measuring?

Primary Outcome Measures

Outcome Measure	Time Frame
Number of proximal junctional kyphosis	Day 1

Secondary Outcome Measures

Outcome Measure	Time Frame
Number of proximal junctional kyphosis leading to revision surgery and the surgical recovery factors.	Day 1

Collaborators and Investigators

• Sponsor: Groupe Hospitalier Paris Saint Joseph

Study record dates

Study Major Dates

• Study Start: June 1, 2015
• Primary Completion (ACTUAL): November 1, 2015
• Study Completion (ACTUAL): November 1, 2015

Study Registration Dates

• First Submitted: August 24, 2016
• First Submitted That Met QC Criteria: August 24, 2016
• First Posted (ESTIMATE): August 29, 2016

Study Record Updates

• Last Update Posted (ACTUAL): August 10, 2018
• Last Update Submitted That Met QC Criteria: August 9, 2018
• Last Verified: August 1, 2016

More Information

Terms related to this study

• Additional Relevant MeSH Terms: Musculoskeletal Diseases; Spinal Diseases; Bone Diseases; Spinal Curvatures; Kyphosis
• Other Study ID Numbers: CYPHORACHI

Plan for Individual participant data (IPD)

• Plan to Share Individual Participant Data (IPD)?: UNDECIDED