Robotic-Assisted Total Hip Arthroplasty Is Associated With Lower Prosthetic Complications in Patients With Lumbar Fusion or Stiff Spine: A Propensity-Matched Cohort Study
Journal of the American Academy of Orthopaedic Surgeons · 13 Aug 2026
† Impact is the editorial-priority score. All scores are out of 100. Clinical is a stored clinical-importance score from the earlier method; it has not been recalculated.
Why it matters
This adds observational support for using robotic assistance in a high dislocation-risk THA population, a decision point residents will face increasingly often as spinopelvic considerations become standard in preoperative planning.
The evidence
This retrospective database study used TriNetX records to compare robotic-assisted versus manual total hip arthroplasty in patients with lumbar fusion or a stiff spine, a group known to have higher dislocation risk. After propensity matching 2,147 patients per group, robotic THA was associated with fewer prosthetic complications at 3 months (1.4% vs 2.7%, OR 1.86, P=0.01), fewer dislocations at 1 year (0.9% vs 1.8%, OR 2.07, P=0.01), and lower revision rates at 2 years (2.0% vs 3.7%, OR 1.86, P<0.001). Benefits were driven mainly by the larger nonfusion 'stiff spine' subgroup, while the smaller spinal fusion subgroup showed no significant differences.
Prosthetic complications (composite: dislocation, periprosthetic fracture, implant fracture, aseptic loosening, PJI, revision): Odds ratio 1.86 (95% CI 1.2 to 2.9; units not reported). The interval favours the comparator; the size of the disadvantage needs clinical interpretation.
Why this rigour score?
Registry cohort (adjusted)
Methods at a glance
Recorded assessment- Confounding adjustmentPropensity scores
- Covariate balance confirmedNot reported
- Outcome assessors blindedNot reported
- Comparable start of follow-upMet
- Adequate statistical powerNot reported
- Prospective registrationNot met
Not reported does not mean not done. Checks have different weights; this is not a count of boxes ticked.
How to read this assessment
The recorded methods are shown alongside the published score. A verified point-by-point calculation is not available for this version of the appraisal.
Checklist from the stored appraisal. “Not met” describes the recorded criterion; it does not always produce a deduction. This overview supports reading the full study.
For journal club
1.Should surgeons preferentially offer robotic-assisted THA to patients with degenerative spinal stiffness even when they lack a formal fusion, given this study's finding that nonfused stiff-spine patients had similar risk reduction?
2.How should the absence of a significant benefit in the spinal fusion subgroup change counselling and technique selection for patients who have already undergone lumbar fusion before THA?
Original publication title
Robotic-Assisted Total Hip Arthroplasty Is Associated With Lower Prosthetic Complications in Patients With Lumbar Fusion or Stiff Spine: A Propensity-Matched Cohort Study