How does gait change after spine surgery?

Before surgery, patients with degenerative lumbar disease typically walk more slowly than matched controls, with shorter steps, reduced cadence, and longer stance and double support. Studies of decompression and fusion report improvements in walking speed, step and stride timing, pain-free walking distance, and sagittal trunk and pelvis alignment during walking, often measurable by three to six months.

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The preoperative pattern

A prospective cohort comparing patients with degenerative lumbar spondylolisthesis against matched asymptomatic controls found the patients walked more slowly, with reduced cadence, longer stride and step time, longer single and double support time, shorter stride and step length, and wider step width.

That combination is recognizable as a cautious, load-limiting pattern: less time on each leg, more time on both, and a wider base.

What changes after surgery

In the same cohort, assessed one week before and three months after lumbar decompression with fusion, surgery was followed by significant improvements in walking speed, stride time, step time, and single support time, along with increased knee and hip flexion range of motion. Patients also reported significant reductions in pain and disability.

Other work on mono- and bisegmental lumbar fusion reported increased pain-free walking distance, walking speed, step length, and maximum hip extension during stance, with anterior pelvic and thorax tilt during walking significantly reduced after surgery.

A prospective study using three-dimensional gait analysis after minimally invasive lumbar interbody fusion reported improvements in time-distance parameters alongside improvements in pain and disability scores, with the two correlated.

Improvement is not the same as normalization. In the spondylolisthesis cohort, most spatiotemporal parameters moved toward the control range after surgery but statistically significant differences from matched controls remained.

Why questionnaires alone do not capture this

Patient-reported measures such as the Oswestry Disability Index record perceived function, which is influenced by pain and by psychological factors. Work in lumbar fusion found that the association between self-report and objective measures of physical function is partial, and that the association changes after surgery as pain diminishes.

The practical consequence is that a questionnaire and a measured walk answer different questions, and following only one leaves a gap in the record.

What this means for follow-up

  • The parameters that move are mostly spatiotemporal — speed, step and stride length and timing, stance and support durations — which are the parameters obtainable without a full kinematics laboratory.
  • Reported timelines centre on three to six months, so a preoperative baseline is necessary for the comparison to mean anything.
  • Sagittal alignment during walking, as distinct from alignment on a static radiograph, is part of what changes.
  • Comparability depends on running the same protocol before and after, in the same conditions.

Where CurveAssure fits

CurveAssure was built for the follow-up problem this creates: capturing a comparable movement record at a preoperative visit and again at follow-up, in a hallway, without booking laboratory time. The parameters it reports for walking are the spatiotemporal ones described above.

Exploratory pelvic alignment and shoulder tilt measures are available in CurveResearch for research use only, and are not part of CurveCapture. CurveCapture does not diagnose, screen for, or detect any disease or condition, and the healthcare provider interprets all output.

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