Dural Grafts in Spinal Lipoma and Tethered Cord Surgery

How spinal lipoma and tethered cord surgery can leave a dural defect, why sac room matters, and where DESU’s DECOLL and DURASHEET collagen grafts fit.

A collagen dural graft comes into consideration in spinal lipoma surgery when the dura cannot be closed directly without tension or without narrowing the sac. Surgical dural defects associated with lipoma are among the uses of DESU’s DECOLL and DURASHEET, both pure Type I bovine collagen membranes. Both can be applied as an onlay, and DURASHEET can also be sutured.

Key takeaways

• Surgical dural defects associated with lipoma are among the uses of both DECOLL and DURASHEET.
• In lipoma surgery the dura is often deficient, and the closure has to leave room around the cord as well as cover it.
• Both membranes can be applied as an onlay; DURASHEET is also suturable and usable from either surface.
• Size follows the planned closure, not only the visible gap, and the surgeon makes the choice.

Lipoma surgery poses a different closure problem from most dural repairs: the dura is often deficient from the start, and the closure has to leave room around the cord as well as cover it. That is where a DESU dural graft may fit. Related closures are covered under meningocele and myelomeningocele repair. Clinical decisions rest with the surgeon, following the instructions for use (IFU).

What is a spinal lipoma, and how does it relate to a tethered cord?

A spinal lipoma is a benign collection of fat connected to the spinal cord or its coverings. It forms during early development, is a type of closed spinal dysraphism and usually lies in the lumbosacral region. Common patterns include:

• Lipoma of the filum terminale, where fat lies within the filum and can tighten it.
• Conus lipoma, where fat attaches to the conus medullaris.
• Lipomyelomeningocele, where fat runs from under the skin through a bony and dural defect and joins the cord.

Because the lipoma anchors the cord, the cord cannot move freely in the canal. This is a tethered cord. Some cases are found in infancy through a fatty lump or skin mark low on the back; others come to attention later with pain, leg weakness, foot problems, or bladder and bowel symptoms. Surgery aims to release the tether and reduce the fat while protecting the neural tissue.

Why does lipoma surgery leave a dural defect?

The dura is part of the anomaly. In a lipomyelomeningocele, the dural edges typically meet the lipoma and the cord at a shared junction, and the fat passes through a gap in the dura. Several things can then stand in the way of direct closure:

• Dividing the junction frees the cord but leaves edges that may not meet.
• The dura around the lesion may be thin, retracted or short.
• The reconstructed cord adds bulk inside a sac that was never normal.
• In a repeat operation, scar can shorten the dura further.

Why does sac capacity matter in a tethered cord closure?

Untethering aims to leave the cord lying free. A tight closure can hold the cord against the repair, and retethering, where the cord scars to the repair site, is a recognised concern after this surgery. Surgeons therefore often look for a roomy sac with CSF around the cord. Where the available dura would not give that room, a graft can widen the sac, even if the edges could technically be brought together.

The closure must also contain CSF, because a leak or pseudomeningocele is another recognised concern in a low lumbar wound. Local fascia is an autologous alternative, though the surgeon may want it for the layers above the dura.

Which DESU dural grafts are used for lipoma-related defects?

Both. Their uses cover surgical dural defects associated with lipoma, alongside meningocele, myelomeningocele and dural defects after spinal tumour surgery and trauma. They share these properties:

• Pure Type I bovine collagen in a biodegradable structure, designed to support the healing process.
• An impermeable pore structure that forms a barrier at the repair site and supports control of CSF leakage.
• Onlay application, at different CSF pressure levels.
• Ready to use with no pre-processing, and gamma sterilised.

A graft is one layer of the repair. It does not replace the surgeon’s reconstruction of the cord or the layered closure above it.

DECOLL or DURASHEET: what does the closure ask for?

DECOLL suits a plan built around an onlay. DURASHEET keeps both routes open and adds high absorption capacity. That helps in lipoma work, where the state of the dural edges may not be known until the junction is divided. Whether to stitch beside a reconstructed cord, and where, the surgeon decides, following the IFU.

Which size suits a lipoma-related defect?

We make both membranes in the same four sizes: 2.5 × 2.5, 5 × 5, 7.5 × 7.5 and 10 × 10 cm. Lipoma cases add one sizing point to the general guidance on spinal and cranial defects: if the graft is there to widen the sac, the width and length of the planned closure matter, not only the visible gap. A size chosen from the gap alone may be too small for that purpose.

Because the defect is hard to predict before surgery, a choice of sizes in the room is more useful than a single one.

What should the theatre team prepare?

• Agree the likely sizes with the surgeon before the case.
• Know the code prefixes: DCL for DECOLL and DRS for DURASHEET, followed by the size, as in DCL5050 or DRS7575.
• If suturing may be needed, keep DURASHEET in the room.
• Expect no pre-processing step: both membranes are supplied ready to use.

Talk to a DESU product specialist

For the IFU, or to plan which DECOLL and DURASHEET sizes to hold for spinal lipoma cases, write to sales@desu.tr, use the contact page, or request a quote.

Frequently asked questions

Does every tethered cord operation need a dural graft?

No. Dividing a fatty filum, for example, usually leaves a simple dural opening that can be closed directly. A graft is more likely to be considered in complex lipomas, where the dura is deficient or a direct closure would be tight.

Do these grafts cover a tethered cord without a lipoma?

The use is surgical dural defects associated with lipoma, together with meningocele, myelomeningocele, spinal tumour surgery and trauma. For a tethered cord with another cause, our product specialists can confirm this for your order.

Can a dural graft prevent retethering?

We make no such claim. Retethering depends on many factors. The membrane’s role is to repair the dural defect as part of the whole closure.

Does the graft stay in place permanently?

No. DECOLL and DURASHEET have a biodegradable collagen structure, designed to support the healing process during dural repair.

Related standards

• ISO 22442 series: Medical devices utilizing animal tissues and their derivatives
• ISO 11137 series: Sterilization of health care products — Radiation
• ISO 10993 series: Biological evaluation of medical devices