Comparing Surgical Options for Cervical Spondylotic Myelopathy
Cervical spondylotic myelopathy (CSM) is the most common cause of spinal cord dysfunction in adults worldwide, and Australia is no exception. Population data from the Australian Institute of Health and Welfare show that degenerative cervical spine conditions account for a substantial share of elective spinal admissions each year, particularly among patients over 60. For clinicians managing this condition at hospitals such as Royal Melbourne, Royal Adelaide, or Westmead, the question is rarely whether to operate, but how.
Over the past three decades, the surgical armamentarium for CSM has broadened considerably. Anterior cervical discectomy and fusion, motion-preserving disc arthroplasty, expansive laminoplasty, instrumented laminectomy, and combined approaches all sit within the toolkit of a contemporary spine surgeon. Each carries its own biomechanical rationale, complication profile, and suitability profile, and the craft of practice lies in matching the patient to the operation rather than the other way round.
This review walks through the principal surgical options for cervical spondylotic myelopathy, summarising the indications, mechanics, and limitations of each. A short comparison table precedes the discussion so that the trade-offs can be appreciated at a glance, after which each technique is examined in more depth alongside the evidence that supports it.
| Approach | Typical indication | Direction | Levels usually treated | Motion preservation | Standard fixation | Notable limitations |
|---|---|---|---|---|---|---|
| Anterior cervical discectomy and fusion (ACDF) | Focal anterior cord compression, 1–3 levels | Anterior | 1–3 | None | Interbody cage with anterior plate | Adjacent segment disease, pseudarthrosis |
| Cervical disc arthroplasty | 1–2 level soft disc disease with preserved motion | Anterior | 1–2 | Preserved | Artificial disc prosthesis | Heterotopic ossification, higher implant cost |
| Laminoplasty | Multilevel dorsal compression, lordotic alignment | Posterior | 3–5 | Preserved via open hinge | Mini-plates or sutures holding the "open door" | Axial pain, incomplete relief in a kyphotic neck |
| Laminectomy (± fusion) | Multilevel stenosis, older patients, poor bone quality | Posterior | 3 or more | Lost if instrumented, partial if stand-alone | Lateral mass or pedicle screws when fused | Post-laminectomy kyphosis without instrumentation |
| Combined anterior-posterior | Severe deformity, circumferential compression, revision | Both | Variable | None | Cage anteriorly, screws posteriorly | High morbidity, longer recovery |
Anterior Cervical Discectomy and Fusion
ACDF remains the workhorse of cervical spine surgery for spondylotic myelopathy, particularly when compressive pathology is anterior and limited to one or two discs. The technique involves thorough discectomy, removal of uncovertebral and posterior osteophytes, and reconstruction of the disc space with an interbody graft or cage, stabilised with an anterior plate. In Australian practice, this is one of the most commonly billed spinal procedures through the Medicare Benefits Schedule, and it is widely performed in both metropolitan teaching hospitals and regional centres such as John Hunter or the Royal Hobart.
The strongest arguments for ACDF are its direct decompression of the cord, reliable fusion rates, and a comparatively forgiving learning curve. Long-term data, including contributions from the Australian Spine Registry, suggest durable neurological improvement in most patients, with mJOA gains of roughly two to three points at five years. Criticisms centre on loss of motion at the operated segments and the risk of adjacent segment disease, which can approach 2.5% per year and may eventually warrant further surgery.
Cervical Disc Arthroplasty
Cervical disc arthroplasty addresses many of the same indications as single- or two-level ACDF but aims to preserve motion at the treated level. After discectomy, the native disc is replaced with a mobile prosthesis such as a low-profile ball-and-socket or saddle-shaped implant. The theoretical advantage is reduced adjacent segment stress, and several industry-supported randomised trials have reported lower reoperation rates at four to seven years when compared with fusion.
In Australia, uptake of arthroplasty has been uneven. Private insurers fund the prosthesis, but the public hospital system generally reserves it for selected patients after multidisciplinary review. Surgeons at high-volume units participating in Spine Society of Australia registry work have generated real-world data that broadly mirror the trial results, although concerns remain about heterotopic ossification, late device wear, and the higher upfront cost of the implant.
Laminoplasty
Where compression is multisegmental and dorsal in nature, typically ossification of the posterior longitudinal ligament or multilevel canal stenosis with maintained cervical lordosis, laminoplasty offers an elegant motion-preserving posterior solution. The "open-door" technique hinges one lamina open and secures it with a small plate or suture anchor, expanding the canal while keeping the posterior tension band largely intact. It also avoids the morbidity of long-segment fusion in patients who still have reasonable cervical alignment.
The technique is well established in East Asian practice and has gained traction in Australia for younger patients with multilevel disease. The main trade-offs are postoperative axial neck pain, which can affect up to a fifth of patients, and incomplete decompression in a fixed kyphotic neck where the cord cannot drift posteriorly away from anterior osteophytes.
Laminectomy With or Without Fusion
Multilevel laminectomy is the most familiar posterior decompression, particularly suited to older patients with friable bone, significant medical comorbidity, or stenosis spanning four or more levels. The technique is quick and provides immediate canal expansion, although it weakens the posterior musculoligamentous complex and can lead to progressive kyphosis if not stabilised.
For this reason, contemporary practice in Australia, guided by both Australian Spine Society advisories and local audit data, favours instrumented laminectomy for patients with pre-existing sagittal malalignment, significant facet arthropathy, or a high risk of post-laminectomy deformity. Lateral mass screws placed under image guidance have made this approach both safer and more reproducible across centres from Perth to Brisbane.
Combined and Hybrid Procedures
Some patients present with disease that no single approach can comfortably address: a kyphotic neck with both anterior osteophytes and posterior ligamentum flavum hypertrophy, a three-level problem with one segment fused and two replaced, or a failed prior operation that now requires circumferential stabilisation. In these situations, surgeons often stage or combine anterior and posterior procedures, sometimes referred to as 360° fusion.
The morbidity is real. Combined cases involve longer anaesthetic time, greater blood loss, and higher rates of dysphagia and wound complications, and they place considerable demand on rehabilitation services. They are, however, often the only reliable option for patients with severe deformity or revision disease, and outcomes in carefully selected cohorts are good.
Selecting the Right Approach for the Right Patient
Matching the operation to the patient is the most consequential decision of all, and it sits at the intersection of imaging, sagittal alignment, comorbidities, and patient priorities. Anterior approaches are favoured for focal kyphosis, large central discs, and younger patients wanting preserved lordosis, whereas posterior options shine in multilevel disease with maintained alignment. Shared decision-making matters: a keen bushwalker from the Kimberley may rate preserved motion far higher than a sedentary octogenarian from a Melbourne nursing home, and trade-offs should be discussed with that lens.
In rural and remote Australia, where travel to a quaternary centre can be a multiday affair, the Royal Flying Doctor Service and state-funded Patient Assisted Travel Schemes shape both the choice of operation and the timing. Surgeons increasingly rely on telehealth follow-up for these patients, although the first postoperative review is still typically in person. Where alignment, bone quality, and level of disease line up, simpler single-stage procedures are generally preferred to spare patients the burden of staged care.
This kind of pragmatic, patient-centred reasoning is echoed in neurosurgical operative viewpoints, where the trade-offs between anterior and posterior cervical surgery are explored in case-based reflections that complement the data presented here.
Evidence, Registries, and Future Directions
The evidence base for CSM surgery has matured substantially. The AOSpine CSM studies, alongside registry reports from the Australian Spine Society and overseas collaborators, now allow surgeons to counsel patients with reasonable confidence about expected outcomes, complication rates, and the durability of decompression. Patient-reported outcomes such as NDI and SF-36 are increasingly captured, and the conversation has shifted from "should we operate" to "how do we operate well."
Future directions include patient-specific instrumentation, intraoperative neuromonitoring refinements, and the slow translation of biologics intended to support myelin recovery after decompression. There is also growing interest in how related implant innovations, such as those described in innovations in cranial implants, might inform the design of load-bearing cervical hardware over the next decade.
Trained through the Royal Australasian College of Surgeons and active in both public hospitals and private practice, A. V. Thamburaj continues to document these shifts on this site, with clinical notes, peer discussion, and an open e-library of neurosurgery references available to registered members. If cervical myelopathy sits within your scope of practice, or if you want to debate the merits of an open-door laminoplasty with colleagues, create a member account, subscribe to updates, and join the conversation in the comments beneath any post. The forum remains an open, collegial space where cases, evidence, and surgical philosophy can be discussed freely across disciplines and across the country.