Spine Journal - 2026-06-03 - Journal Article
Network-Based Analysis of Health-Related Quality of Life Following Surgery for Degenerative Cervical Myelopathy.
Kitagawa T, Nagoshi N, Yamane J, Okubo T, Shibata R, Kobayashi Y, Fujiyoshi K, Yato Y, Yamamoto T, Kitamura K, Ikegami T, Ago K, Fukuda K, Iga T, Takeda K, Ozaki M, Suzuki S, Matsumoto M, Nakamura M, Watanabe K
Topics
Key Takeaway
In 849 DCM surgical patients, network analysis revealed that surgery reorganizes SF-36 domain interdependencies rather than uniformly strengthening them, with Role Physical emerging as the most central HRQoL domain both pre- and postoperatively.
Summary Depth
Choose how much analysis to show on this article page.
Summary
This study applied Gaussian graphical models to SF-36 data from 849 DCM surgical patients across 10 Japanese centers to map how HRQoL domain interdependencies change after surgery. Network structure differed significantly between pre- and postoperative states at the domain level, but global network strength was unchanged, indicating structural reconfiguration rather than global connectivity gain. Role Physical was the highest-centrality domain preoperatively and increased further postoperatively; non-responders by JOA criteria additionally showed rising centrality of General Health.
Key Limitation
The study population is exclusively from high-volume Japanese centers, limiting generalizability to Western DCM populations with different surgical thresholds, comorbidity profiles, and cultural SF-36 response patterns.
Original Abstract
BACKGROUND CONTEXT
Health-related quality of life (HRQoL) is a key outcome in degenerative cervical myelopathy (DCM), however, conventional score-based analyses do not capture the complex interdependencies among HRQoL domains or how these relationships change following surgery.
PURPOSE
To characterize the structural organization of HRQoL in patients with DCM using a network-based approach.
STUDY DESIGN/SETTING
Prospective multicenter observational study.
PATIENT SAMPLE
A total of 849 patients undergoing surgical treatment for DCM at 10 high-volume spine centers in Japan.
OUTCOME MEASURES
HRQoL was assessed using the Short Form-36 (SF-36), including eight domain scores and summary component scores, measured at baseline, one to two years postoperatively.
METHODS
Gaussian graphical models were used to construct item-level and domain-level HRQoL networks from preoperative and postoperative SF-36 data. Network comparison tests assessed changes in network structure, global strength, and individual edge weights following surgery. Centrality was quantified using strength and expected influence. Subgroup analyses were performed based on postoperative Japanese Orthopaedic Association (JOA) score responsiveness.
RESULTS
Network structure differed significantly between preoperative and postoperative phases at the domain level, whereas global network strength remained unchanged, indicating a reconfiguration of HRQoL relationships rather than uniform strengthening. Role physical (RP) emerged as the most central domain preoperatively and demonstrated a further increase in centrality after surgery. In both subgroups, RP remained highly central after surgery, whereas non-responders additionally exhibited an increase in the centrality of general health.
CONCLUSIONS
Surgical treatment for DCM is associated with a reorganization of the HRQoL network structure rather than a global increase in connectivity. The increasing centrality of RP highlights its potential role in postoperative HRQoL recovery. Network analysis provides a novel framework for understanding HRQoL in DCM and underscores the importance of postoperative strategies aimed at restoring daily role functioning to maximize patient-centered outcomes.