Sacroiliac Research Articles

Sacroiliitis in familial Mediterranean fever: A rare joint involvement of the disease.

Familial Mediterranean fever (FMF) is a monogenic autoinflammatory disease characterised by recurrent episodes of fever and polyserositis. Sacroiliac joint involvement is rare in FMF patients. The purpose of this study was to evaluate the demographic, clinical, laboratory and imaging findings of patients with FMF who developed sacroiliitis. The files of paediatric patients aged 0-18 years who were followed up with a diagnosis of FMF were retrospectively reviewed. FMF patients with evidence of sacroiliitis on magnetic resonance imaging (MRI) were included in the study. Among 1062 FMF patients, 22 (12 males; median age 8.5) (2.1%) of them were found to have sacroiliitis. FMF was diagnosed before sacroiliitis in nine (40.9%) patients and after in 13 (59.1%) patients. The most common symptom in patients with sacroiliitis was low back pain (n = 21, 95.5%). In MEFV gene analysis, M694V was found in 16 (72.7%) patients and was the most common mutation. MRI showed evidence of sacroiliitis in all patients. All patients were using colchicine. Patients with FMF-associated sacroiliitis, remission was achieved with non-steroidal anti-inflammatory drugs in 12 (54.5%), conventional disease-modifying antirheumatic drugs in six (27.3%) and tumour necrosis factor inhibitor treatment in four (31.8%). Four (31.8%) patients experienced sacroiliitis when colchicine incompatible and four (31.8%) patients experienced sacroiliitis while using biologic agents for colchicine-resistant FMF. FMF-associated sacroiliitis should be considered especially in patients with M694V mutation if they have symptoms such as low back pain. Colchicine-resistant FMF patients should be evaluated for sacroiliitis symptoms at each visit.

Axial spondyloarthritis—current aspects

Axial spondyloarthritis (axSpA) is a frequent inflammatory rheumatic disease mainly affecting the axial skeleton causing inflammatory back pain. If chronic inflammation persists new bone formation may occur possibly leading to irreversible spinal stiffness. The disease has a strong genetic background with HLA-B27 as the major factor. For diagnostic purposes, imaging is of critical importance—especially conventional radiography and magnetic resonance imaging (MRI). While the former has advantages in the detection of bony changes such as the syndesmophytes, MRI is used to detect axial inflammation but also erosions in the sacroiliac joint. Treatment follows the treat-to-target strategy starting with non-steroidal anti-inflammatory drugs (NSAIDs) in the first line, and later, if high disease activity persists, therapy with biologic disease modifying anti-rheumatic drugs (bDMARDs) is according to international recommendations indicated. For the treatment of axSpA, important targets such as tumor necrosis factor alpha (TNFα) and interleukin (IL)-17 have been identified, and several of their inhibitors (i) including some biosimilars for the former have been approved. Recently, also inhibition of Janus kinases was shown to be efficacious. There is evidence that long term inhibition of inflammation with TNFi can reduce bone formation.

T2* cartilage mapping in early axial spondyloarthritis: diagnostic accuracy and correlation with clinical characteristics, sacroiliitis MRI scorings, and diffusion metrics.

To determine the performance of T2* cartilage mapping in diagnosing and assessing disease activity in early axial spondyloarthritis (axSpA), and to investigate the interaction of cartilage damage with clinical characteristics, sacroiliitis MRI scorings, and diffusion metrics. This prospective study included 83 axSpA patients and 37 no-axSpA patients. Clinical characteristics, the Assessment of SpondyloArthritis International Society-defined active sacroiliitis on MRI, and T2* SIJs values were recorded. In axSpA, disease activity was evaluated using the ankylosing spondylitis disease activity score-C-reactive protein; active sacroiliitis was evaluated using Spondyloarthritis Research Consortium of Canada, intravoxel incoherent motion, and diffusion kurtosis imaging; chronic sacroiliitis was assessed using composite structural damage score (CSDS) and structural score fat. Mann-Whitney U-test, Kruskal-Wallis test with false discovery rate (FDR), ROC curve, and linear regression were used for statistical analysis. AxSpA patients had significantly higher T2*SIJs values than no-axSpA patients. (22.86 ± 2.42 ms vs 20.36 ± 1.30 ms, p < 0.001). The combination of T2*SIJs values and active sacroiliitis on MRI had the highest AUC for identifying axSpA. T2*SIJs values were significantly different between the inactive and very high, moderate and very high, high and very high, as well as inactive and high disease activity groups (all pFDR < 0.05). Dk (β = 0.48) and CSDS (β = 0.48) were independently associated with T2*SIJs values. T2* values may be a promising biomarker for diagnosing and differentiating disease activity in early axSpA. Both acute and chronic sacroiliitis influence cartilage properties. Sacroiliac joint cartilage abnormalities can be quantified with T2* relaxation time and allow better characterization of early axSpA. T2* mapping may have value in evaluating axSpA. The combination of T2* values and active sacroiliitis on MRI enhances diagnostic performance for axSpA. Abnormalities measured with T2* values correlate with disease activity, acute sacroiliitis, and degree of structural damage.

The Low Back Pain - Looking For a Physiotherapeutic Approach

BACKGROUND: Low back pain (LBP) is one of the most common neurological complaints. It affects young people but has a slow progression even at a later age. LBP is a condition with a rich clinical picture – pain, severely limited range of motion in the spinal column (especially in the area of the L4-L5 segment) and sacro-iliac joints, difficulty walking. Physiotherapy has an essential role in maintaining the general condition and improving the quality of life for this contingent of patients. AIM: The aim of the present study is to create and approve a physiotherapy methodology for pain reduction in patients diagnosed by a neurologist – radiculitis of the lumbo-sacral plexus. METHODS: 20 clinically proven patients divided into two groups were included in the study. After signing informed consent declarations and assessment of anthropometric data (age, height, and weight), the subjects were evaluated with neurological tests such as Lasegue test and dolorimetry. Results were also reported on the Barthel index scale. RESULTS: The dynamics of dolorimetry results, quality of life, and mobility in the spine area (especially the lumbar segment) were monitored in the two studied groups, with the results in the experimental group demonstrating better values (p &lt; 0.0001). CONCLUSION: There is no unified system for pain reduction in patients with LBP. As a result of applied physiotherapy, including modern techniques for myofascial massage, a faster increase in joint mobility in the area of the spine and sacroiliac joints, an improvement in muscle strength and, above all, a reduction in pain symptoms were found.

Standardized reporting of spine and sacroiliac joints in axial spondyloarthritis MRI: from the ESSR-Arthritis Subcommittee.

Apply a modified Delphi-based approach and produce a practical, radiology-specific set of definitions for interpretation and standardization of the multiple MRI findings in axial spondyloarthritis (ax-SpA), specifically to aid the general radiologist with a musculoskeletal interest, working with gold standard basic MRI protocols. We report the results of a modified Delphi-based consensus of 35 experts from 13 countries in the Arthritis Subcommittee of the European Society of Musculoskeletal Radiology (ESSR). Seventeen definitions were created (i.e., nine for the spine and eight for the sacroiliac joint) and two Delphi rounds were conducted on an electronic database, collated and revised by the project leader with agreement. Group leads were appointed for each definition following the first round. Final definitions included only those that reached a consensus > 80%; if > 50% agreed on exclusion consensus, definitions were excluded. Final results have been shared during the Arthritis meeting at the Annual ESSR Congress. Fourteen definitions, eight for the spine and six for the sacroiliac joint were agreed for standardized reporting. Andersson's, anterior corner sclerotic and costovertebral joint inflammatory lesions of the spine, with active and non-active erosions, and fat metaplasia of the sacroiliac joint reaching the highest consensus (≥ 95%). More than 50% of the experts agreed to exclude joint space inflammation in the sacroiliac joint and tissue backfill. Syndesmophytes reached 76% agreement. Agreed definitions by expert radiologists using a modified Delphi process, should allow standardized actionable radiology reports and clarity in reporting terminology of ax-SpA. The proposed definitions will support reporting from musculoskeletal and general radiologists working with gold-standard basic MRI, improve confidence in lesion assessment, and standardize terminology to provide actionable reports on MRI in patients with ax-SpA. Experts applied a modified Delphi method to optimize the definitions of MRI findings of ax-SpA. After two Delphi rounds and one in-person meeting, fourteen definitions reached the agreement threshold. These consensus-based definitions will aid in actionable reporting specifically for the general radiologist with a musculoskeletal interest.

Prevalence of Osteoporosis and Sarcopenia in Middle-Aged Subjects with Low Back Pain

Abstract Objective The genesis of both osteoporosis and sarcopenia is multifactorial, complicated, and interrelated. The present study has been undertaken to analyze the prevalence of low bone mineral density (BMD) and the pattern of imaging markers of sarcopenia (paraspinal skeletal muscle area [SMA] and skeletal muscle index [SMI] with respect to clinicodemographic profile in middle-aged patients (30–45 years) undergoing evaluation for low back pain (LBP). Materials and Methods Magnetic resonance imaging (MRI) of the lumbosacral spine and/or sacroiliac joints was done on 3T MRI. BMD of the lumbar spine (L1 to L4) was assessed using a dual-energy X-ray absorptiometry scan. SMA was calculated by measuring the cross-sectional area of paraspinal muscles (bilateral psoas, erector spinae, and multifidus), and SMI was calculated by dividing SMA by height2. Results The prevalence of osteoporosis was 12.1% in patients of age 30 to 45 years presenting with LBP. Both osteoporosis and paraspinal muscle mass were statistically associated with the duration of symptoms (p-value &lt;0.05). No statistically significant difference was observed in different MRI findings, that is, normal, inflammatory, infective, and degenerative etiology. Conclusion Low BMD and loss of muscle mass in cases with LBP are more related to duration of disease rather than etiology or gender in middle-aged subjects. Early intervention to manage LBP may prevent progression to osteoporosis and sarcopenia in young adults.

Use of corticosteroids for adult chronic pain interventions: sympathetic and peripheral nerve blocks, trigger point injections - guidelines from the American Society of Regional Anesthesia and Pain Medicine, the American Academy of Pain Medicine, the American Society of Interventional Pain Physicians, the International Pain and Spine Intervention Society, and the North American Spine Society

BackgroundThere is potential for adverse events from corticosteroid injections, including increase in blood glucose, decrease in bone mineral density and suppression of the hypothalamic–pituitary axis. Published studies note that doses...

Pediatric-Specific Lesions in Unstable Pelvic Ring Fractures of Skeletally Immature Children: Impact on Diagnosis and Management Decisions.

Surgical fixation of pediatric pelvic ring injuries is gaining popularity to avoid the poor long-term outcomes of pelvic asymmetry. The surgical techniques and fixation choices depend on the individual injuries affecting the anterior and posterior pelvic ring areas. The immature bony pelvis of young children has anatomic differences including soft bones, elastic ligaments, and the presence of growth centers. Understanding the unique pediatric lesions with unstable pelvic fractures is essential for treatment decisions. Anterior lesions include pubic symphysis disruption through the pubic apophysis, single ramus fractures, pubic rami fractures through the triradiate cartilage, and/or the ischiopubic synchondrosis; ischiopubic ramus infolding injury; or the unstable superior and inferior quadrant lesions. Posterior pelvic lesions include iliac wing infolding and sacroiliac joint dislocation or transiliac (crescent) fracture/dislocations through the iliac apophysis growth plate. Pubic symphysis and sacroiliac disruptions are physeal injuries in children, and they have excellent healing potential. External fixation is an ideal choice for anterior ring fixation including bony and pubic symphysis injuries. Posterior lesions are mostly sacroiliac joint disruptions with iliac apophysis separation that can serve as a landmark for vertical displacement correction. Posterior lesions can be treated by percutaneous iliosacral screw fixation or open reduction techniques.

Plate fixation of inferior ramus in pubis-ischium ramus improves mechanical stability in Tile B pelvic injures: a cadaveric biomechanical analysis and early clinical experience

BackgroundManagement of inferior ramus of the pubis-ischium ramus remains controversial, and related research is sparse. The main intention of this study is to describe the biomechanical and clinical outcomes of pubis-ischium ramus fractures in Tile B pelvic injuries and to identify the feasibility and necessity of fixation of the inferior ramus of the pubis-ischium ramus.MethodsThis study comprised two parts: a biomechanical test and a retrospective clinical study. For the biomechanical tests, Tile B-type pelvic injuries were modeled in six cadaver specimens by performing pubis-ischium osteotomies and disruption of the anterior and interosseous sacroiliac ligaments. The superior and/or inferior rami of the pubis-ischium ramus were repaired with reconstruction plates and separated into three groups (A, B, and C). Specimens were placed in the standing position and were loaded axially with two-leg support for three cycles at 500 N. The displacements of sacroiliac joints at osteotomy were measured with Vernier calipers and compared using statistical software. To investigate the clinical outcomes of this technique, 26 patients were retrospectively analyzed and divided into a superior ramus fixation group (Group D) and a combined superior and inferior ramus of the pubis-ischium ramus fixation group (Group E). The main outcome measures were time of operation, blood loss, postoperative radiographic reduction grading, and functional outcomes.ResultsIn the vertical loading test, Group E showed better pelvic ring stability than Group D (P < 0.05). However, the shift of the sacroiliac joints was almost identical among the three groups. In our clinical case series, all fractures in Group E achieved bony union. Group E demonstrated earlier weight-bearing functional exercise (2.54 ± 1.45 vs 4.77 ± 2.09; P = 0.004), earlier bony union (13.23 ± 2.89 vs 16.55 ± 3.11; P = 0.013), and better functional outcomes (89.77 ± 7.27 vs 82.38 ± 8.81; P = 0.028) than Group D. The incidence of sexual dysfunction was significantly lower in Group E than that in Group D (2/13 vs 7/13; P = 0.039). Bone nonunion occurred in two patients in Group D, and two patients in Group E had heterotopic ossification. None of the patients exhibited wound complications, infections, implant failures, or bone–implant interface failures.ConclusionsFixation of the inferior ramus of a pubis-ischium ramus fracture based on conventional fixation of the anterior pelvic ring is mechanically superior in cadaveric Tile B pelvic injury and shows rapid recovery, good functional outcomes, and low incidence of complications.

Bone remodeling after revision total hip arthroplasty for large acetabular defects.

Large acetabular bone defects are challenging in hip revision surgery. Clinical assessment is crucial to evaluate modern technologies in surgical reconstruction. We aimed to better understand the bone remodeling that occurs following acetabular reconstruction. Our objectives were: (1) To characterize changes in the shape of the pelvis by studying sequential computed tomography (CT) scans collected immediately and 1-year postoperatively and (2) to identify which part of the pelvis is most susceptible to remodeling. We used the CT scans taken at two timepoints, of 24 patients with acetabular bone defects classified as Paprosky IIIB, treated with three-dimensional (3D)-printed custom-made acetabular implants. Segmented 3D models of the bony pelvis were co-registered using three different techniques. A global co-registration of the full pelvis was conducted, followed by the co-registration of the innominate bone and then ilium only, on the ipsilateral reconstructed side. The relative movements of the ilium, ischium, and pubis were analyzed from visual inspection and using co-registration metrics (root mean square error and intersection over union). No bone remodeling was found in 14/24 patients (58%). The co-registration of the innominate bone indicated bone remodeling in five cases (21%), while the remaining five cases (21%) presented remodeling in the global co-registration but not the innominate bone co-registration, suggestive of changes occurring at the sacroiliac joint. Changes in the pelvic shape were greatest at the pubis and ischium. Bone remodeling may occur in complex cases of Paprosky type IIIB defects, after acetabular reconstruction (occurrence of 21%, 5/24 cases). Surgeons and engineers should consider this when monitoring implant migration.

A Narrative Review of Ultrasound-Guided and Landmark-based Percutaneous Cryoneurolysis for the Management of Acute and Chronic Pain.

Cryoneurolysis refers to the process of reversibly ablating peripheral nerves with extremely cold temperatures to provide analgesia for weeks to months. With ultrasound-guidance or landmark-based techniques, it is an effective modality for managing both acute and chronic pain. In this review, we summarize the reported literature behind its potential applications and efficacy. Here, we summarize several studies (from case reports to clinical trials) describing the use of ultrasound-guided and landmark-based cryoneurolysis for acute and chronic pain. Acute pain indications included pain related to knee arthroplasty, limb amputations, mastectomies, shoulder surgery, rib fractures, and burn. Chronic pain indications included chronic knee pain (due to osteoarthritis), shoulder pain, painful neuropathies, postmastectomy pain syndrome, phantom limb pain, facial pain/headaches, foot/ankle pain, inguinal pain, and sacroiliac joint pain. For both acute and chronic pain indications, more high quality randomized controlled clinical trials are needed to definitively assess the efficacy of cryoneurolysis versus other standard therapies for a multitude of pain conditions.

Minimally Invasive Sacroiliac Joint Fusion: A Systematic Review and a Meta-Analysis

Abstract Background Low back pain (LBP) is a worldwide health problem and one of the top three causes of health deterioration in affluent countries. After the common cold, LBP is the second most prevalent reason for visits to primary care providers. Aside from high levels of disability and lost income, LBP increases the risk of falls in the elderly, which can result in hip and/or spinal fractures, increasing morbidity and mortality in this vulnerable group. Materials and Methods Application of inclusion and exclusion criteria to study Abstracts yielded 9 articles. A total of 390 studies were identified from the database search. After review, a total of 9 studies consisting of 1224 patients with SIJF were selected. Results A total number of 1224 patients with SIJF were selected. The 9 studies ranging from 2012 to 2019. Among the 9 studies were 4 randomized control trials and 2 studies were retrospective studies. Among the patients, 407 males and 817 females. The age ranged from 24 years to 81 years among the 9 studies. The follow-up duration ranged from 6 months to 2 years among our studies. Conclusion The meta-analysis performed in this systematic review demonstrated that patients who fail conservative therapy and have a positive diagnostic SI joint block may clinically benefit from minimally invasive sacroiliac joint fusion using a lateral trans-articular approach. Sacroiliac joint fusion appears to be a satisfactory procedure for alleviating low back pain.

Prediction of the activity of early ankylosing spondylitis using radiomics texture analysis on short tau inversion recovery (STIR).

The study aimed to explore the value of texture analysis of radiomics based on the short tau inversion recovery (STIR) sequence to evaluate the activity of bone marrow oedema of sacroiliac joints in early AS. 43 patients with early AS whose data were randomly divided into the training cohort (n=116) and verification cohort (n=56) according to the ratio of 7:3. The optimal feature subsets were obtained by Mann-Whitney U-test, the minimum-Redundancy Maximum-Relevancy (mRMR), and then least absolute shrinkage and selection operator (LASSO) using these texture feature parameters, which were used to construct the final prediction model and obtained the Radscore. The ROC curve was performed to evaluate the performance of the model. The Spearman correlation test was used to analyse the correlation of various indicators. In the training cohort, to differentiate early AS sacroiliac joint bone marrow oedema between the active and stable groups, the AUCs of the Radscore, SPARCC and ADC were 0.81, 0.91, 0.78, respectively. In the validation cohort, the AUCs were 0.87, 0.89, 0.85. In the two cohorts, there were no significant differences in AUCs between values of the Radscore and SPARCC, ADC (p>0.05). There was a significant difference in AUC between SPARCC and ADC in the training cohort (p<0.05), with no statistical significance in the validation cohort (p>0.05). The correlations were all low between the Radscore values and the values of ESR, CRP, tI, ASDAS-ESR and ASDAS-CRP (p<0.05). Radiomics analysis based on STIR texture analysis has a good prediction for the evaluation of bone marrow oedema activity of sacroiliac joints in AS. It can be a new non-invasive and objective evaluation method for AS activity.

Relationship between Kinesiophobia and Disability in Individuals with Sacroiliac Joint Dysfunction: A Pilot Study

Abstract Introduction: Sacroiliac joint (SIJ) dysfunction, which accounts for 15%–30% of all low back pain, can be caused due to multiple pathologies and can cause long-term disability because of fear of movement and result in chronic pain. The paucity of literature regarding the same in SIJ dysfunction warranted this study. Hence, this study aimed to assess the presence of kinesiophobia and determine if there exists a correlation between kinesiophobia and disability in individuals with SIJ dysfunction. Materials and Methods: After ethical clearance, participants were screened for SIJ dysfunction (n = 22) from physiotherapy at the outpatient department of tertiary care hospitals, and assessment was taken; participants meeting the inclusion criteria were selected for the study (n = 19). Outcome measures – Tampa Scale of Kinesiophobia (TSK) and Oswestry were then administered. Results: Among 19 participants (male = 11 and female = 08), mean and standard deviation of TSK and Oswestry Scale were (39.95 ± 8.29) and (29.26 ± 16.73), respectively. A weak correlation (r = 0.204) was observed between the two, which was not statistically significant (P = 0.401). Conclusion: This study suggests that chronic pain may lead to a vicious cycle of fear of movement and avoidance of activities delaying the rehabilitation process. Psychological aspects of pain with conventional physiotherapy should be addressed in such patients.

Pelvic Fixation in Adult Deformity: Does the SI Joint Need to Be Fused?

Pelvic Fixation in Adult Deformity: Does the SI Joint Need to Be Fused?

Pelvic Fixation in Adult Deformity: Does the SI Joint Need to Be Fused?

Pelvic Fixation in Adult Deformity: Does the SI Joint Need to Be Fused?

Injury to the Superior Gluteal Artery During Minimally Invasive Sacroiliac Joint Fusion: A Case Series.

A rarely reported complication with sacroiliac joint fusion (SJF) is an iatrogenic injury to the superior gluteal artery (SGA). This case series includes 3 cases which had a suspected injury to the SGA. Case 1 describes how hemostasis achieved with exploration of the wound followed by embolization by interventional radiology (IR). In Case 2, electrocautery, hemostatic agents, and pressure were used with success. Case 3 highlights the use of IR as the initial method for controlling bleeding. This report describes a rare complication during SJF and provides an algorithm to help guide surgeons in decision making.

Unveiling the relationship: Sacroiliac Joint Dysfunction as an Overlooked Factor in Lumbar Back Pain

Introduction: The Sacroiliac joint (SIJ) is a crucial connection found between the sacrum and ilium. It plays a vital role in transferring forces during physical activity, such as running. Its biomechanical function is crucial for ensuring stability, as it is supported by ligaments and pelvic floor muscles that work together to ensure this for individuals. However, SIJ dysfunction can be linked to lower back pain, which is a condition that affects around 70-85% of Western society. Causes: SIJ dysfunction originates from various factors, such as abnormal motion or malalignment. These conditions can arise from multiple causes: arthritis, trauma, or nontypical gait patterns. Diagnosis: Physical examinations are included in the diagnosis of SIJ dysfunction. They are called FABER, compression, distraction, thigh thrust, and Gaenslen. Three provocative test results are oftentimes required for a diagnosis. Other methods of diagnosis are also used, like X-rays, MRIs, and joint injections. Misdiagnosis: Nevertheless, although multiple methods exist to diagnose SIJ dysfunction, it is very commonly misdiagnosed. This is because the condition mimics symptoms of other conditions, and its etiology is overlooked. Treatment: When diagnosed, SIJ dysfunction can be treated through a range of measures. Either conservative treatments can be done, like physical therapy and NSAIDs, or more invasive procedures, such as surgical interventions, can be used to treat SIJ dysfunction. Conclusion: SIJ dysfunction is a prevalent, misdiagnosed condition that affects many individuals. This review highlights the importance of raising awareness among the public and clinicians to ensure an accurate diagnosis and treatment is given to patients.

Unveiling the impact of chronic back pain: do not forget sacroiliac joint dysfunction

Unveiling the impact of chronic back pain: do not forget sacroiliac joint dysfunction

Decrease in pelvic incidence after adult spinal deformity surgery is a predictive factor for progression of hip joint osteoarthritis

BackgroundThis study aimed to evaluate the association between spinopelvic alignment parameters and hip osteoarthritis progression after spinal alignment correction surgery for adult spinal deformity, focusing on the preoperative to postoperative change in spinopelvic alignment.MethodsThis retrospective study enrolled 100 adult spinal deformity patients (196 hip joints) who underwent spinal fusion surgery, after excluding four joints with previous total hip arthroplasty. Acetabular roof obliquity (ARO), center edge angle (CE) and Kellgren and Lawrence (KL) grade were measured in the hip joint. Spinopelvic alignment parameters were measured preoperatively and 1-month postoperatively and the changes (Δ) during this period were calculated. Patients were followed-up for ≥ 5 years and factors associated with KL grade progression at 5-years postoperatively were determined by logistic regression analysis.ResultsIn the analysis with all cases, KL grade progressed in 23 joints. Logistic regression analysis revealed age (OR: 1.098, 95% CI: 1.007–1.198, p = 0.019), ARO (OR: 1.176, 95% CI: 1.01–1.37, p = 0.026), and Δ PI (OR: 0.791, 95% CI: 0.688–0.997, p < 0.001) as parameters significantly associated with KL grade progression. On the other hand, in the analysis limited to 185 cases with 1-month postoperative KL grade of 0, KL grade progressed in 13 joints. Logistic regression analysis revealed PI-LL (OR: 1.058, 95% CI: 1.001–1.117, p = 0.04), ΔPI (OR: 0.785, 95% CI: 0.649–0.951, p < 0.001), and ΔCobb (OR: 1.127, 95% CI: 1.012–1.253, p = 0.009) as parameters significantly associated with progression.ConclusionsBoth the overall and limited analyzes of this study identified preoperative to postoperative change in PI as parameters affecting the hip osteoarthritis progression after spinal fusion surgery. Decrease in PI might represent preexisting sacroiliac joint laxity. Patients with this risk factor should be carefully followed for possible hip osteoarthritis progression.