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Revision of Harrington rod constructs: a single-center’s experience with this homogenous adult spinal deformity population at a minimum 2-year follow-up

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Abstract

Purpose

To evaluate radiographic and clinical outcomes following revision surgery after HRC fusions.

Methods

Single-institution, retrospective study of patients revised following HRC with minimum 2-year follow-up post-revision. Demographics, perioperative information, radiographic parameters, complications, and Oswestry disability index (ODI) scores were collected. Radiographic parameters included global alignment, coronal and sagittal measurements pre and postoperatively, as well as final follow-up time points.

Results

26 patients were included with a mean follow-up of 3.3 ± 1.1 years. Mean age was 55.5 ± 7.8 years, BMI 25.2 ± 5.8, and 22 (85%) were females. Instrumented levels increased from 9.7 ± 2.8 to 16.0 ± 2.2. Five (19.2%) patients underwent lumbar pedicle subtraction osteotomies, and 23 (88.4%) had interbody fusions. Patients significantly improved in all radiographic parameters at immediate and final follow-up (p < 0.005), except for thoracic kyphosis and pelvic incidence (p > 0.05). Correction was maintained from immediate postop to final follow-up (p > 0.05). 20 (76.9%) of patients experienced a complication at some point within the follow-up period with the most common being a lumbar nerve root deficit (n = 7). However, only one patient had a nerve root deficit at final follow-up, that being a 4/5 unilateral anterior tibialis function. 5 (19.2%) patients required further revision within a mean of 1.8 ± 1.1 years. On average, patients had an improvement in ODI score by final follow-up (35.6 ± 16.8 vs 25.4 ± 19.8, p = 0.035).

Conclusion

Patients revised for HRCs significantly improve, both clinically and radiographically by final follow-up. This group did have a propensity for distal lumbar root neurological issues, which were common but all patients except for one, recovered to full strength by two-year follow-up.

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Data availability

Data is not publically available but available upon request.

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Funding

The authors did not receive support from any organization for the submitted work.

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Authors and Affiliations

Authors

Contributions

SS, FMH, CM, AP, EL, JML, ZMS, RAL and LGL: contributed to the concept/design of the work, drafted the work, acquisition, analysis, and interpretation of the data, approved the version to be published, agrees to be accountable for all aspects of the work.

Corresponding author

Correspondence to Fthimnir M. Hassan.

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Conflict of interest

Fthimnir M. Hassan, Erik Lewerenz, Christopher Mikhail, Stephen Stephan, and Andrew Platt, have no relevant financial or non-financial interests to disclose. Lawrence G. Lenke has received grant support from AO Spine, International Spine Summit Group, Scoliosis Research Society, EOS Technology and Setting Scoliosis Straight Foundation as a study investigator. Ronald A. Lehman has received grant support from the Department of Defense as a study investigator. Joseph M. Lombardi, Zeeshan M. Sardar, Ronald A. Lehman, and Lawrence G. Lenke have received consulting fees from Medtronic. Joseph M. Lombardi has received consulting fees from Stryker. Lawrence G. Lenke has received consulting fees from Acuity Surgical and Abryx. Lawrence G. Lenke has received reimbursements from Broadwater, AO Spine, and Scoliosis Research Society for attending meetings/travel. Ronald A. Lehman and Lawrence G. Lenke have received royalties and are patent holders from Medtronic. Ronald A. Lehman has received royalties and is a patent holder from Stryker.

Ethical approval

AAAR6015 This retrospective chart review study involving human participants was in accordance with the ethical standards of the institutional and national research committee and with the 1964 Helsinki Declaration and its later amendments or comparable ethical standards. The Human Investigation Committee (IRB) of Columbia University Irving Medical Center approved this study.

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Informed consent was obtained from all individual participants included in the study.

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Stephan, S.R., Hassan, F.M., Mikhail, C. et al. Revision of Harrington rod constructs: a single-center’s experience with this homogenous adult spinal deformity population at a minimum 2-year follow-up. Spine Deform (2024). https://doi.org/10.1007/s43390-024-00867-2

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