Postoperative Bone Nonunion Treatment in Germany

Postoperative bone nonunion (Postoperative knöcherne Unheilbarkeit) is the absence of bone healing after surgical intervention: osteosynthesis, spinal fusion, corrective osteotomy, arthrodesis. It is one of the most severe complications of orthopedic surgery, often requiring repeat operations. Nonunion after spinal fusion is one of the key causes of failed back surgery syndrome (FBSS). German clinics employ revision techniques, autologous bone grafting, BMP, and innovative MIBRAR® therapy to stimulate osteogenesis.

What is Postoperative Bone Nonunion

After bone surgeries (fracture osteosynthesis, spinal fusion, osteotomy, arthrodesis), bone union is expected within certain timeframes. For long bone osteosynthesis — 3–6 months, for spinal fusion — 6–12 months. If union does not occur, postoperative nonunion (pseudarthrosis) is diagnosed.

The difference from regular fracture nonunion: postoperative nonunion develops despite surgical intervention that was itself supposed to provide optimal conditions for healing. This indicates the presence of additional unfavorable factors — biological, mechanical, or combined.

Incidence: nonunion after spinal fusion — 5–35% (depending on level, number of fused segments, and risk factors). After osteosynthesis — 5–10%. After corrective osteotomies — 2–5%.

Causes

1. Nonunion after spinal fusion (spinal pseudoarthrosis):
   • Insufficient decortication and graft bed preparation
   • Inadequate graft choice (allograft is less effective than autograft)
   • Excessive mobility of the fixed segment (screw loosening)
   • Long fusion (> 3 levels) — the longer the construct, the higher the risk
   • Osteoporosis — screws "back out" from weakened bone
2. Nonunion after osteosynthesis:
   • Inadequate reduction — persistent gap between fragments
   • Unstable fixation — thin plate, insufficient number of screws
   • Blood supply disruption during extensive surgical dissection
   • Infection — postoperative osteomyelitis
3. Systemic factors — smoking (reduces healing rate by 40%!), diabetes mellitus, NSAIDs, corticosteroids, vitamin D deficiency, poor nutrition, obesity.

Symptoms

• Persistent or recurrent pain — pain at the surgical site that does not diminish over time. In spinal pseudoarthrosis — back pain worsening with activity and relieved at rest.
• Construct instability — pain with movement, sensation of hardware "looseness." Metallic crepitus.
• Hardware fracture — fatigue fracture of the rod or plate with prolonged nonunion. Characteristic "click" with increased pain.
• Screw migration — loosening and displacement of screws. In spinal fusion — "halo sign" on CT (radiolucency around the screw).
• Neurological symptoms — in spinal pseudoarthrosis: recurrent radicular pain, numbness, weakness due to instability and nerve compression.
• Deformity — deformity progression (kyphosis in spinal fusion, valgus/varus in osteotomy).

Diagnostics

1. CT with 3D reconstruction — gold standard! Visualization of bony bridges (or their absence) between fragments/vertebrae. Halo sign around screws. Hardware fracture.
2. Functional X-ray — dynamic views (flexion/extension for spinal fusion) to assess mobility at the fixation zone. Mobility > 3–5° indicates pseudoarthrosis.
3. MRI (with metal artifact suppression) — MARS protocol for soft tissue visualization in the presence of hardware. Assessment of infection, abscess, scarring.
4. Scintigraphy / SPECT-CT — metabolic activity assessment. "Hot" zone around the nonunion segment.
5. Laboratory tests — ESR, CRP (infection exclusion); calcium, vitamin D, PTH; bone metabolism markers; TSH.
6. Diagnostic block — in spinal pseudoarthrosis: anesthetic injection into the suspected nonunion zone to confirm the pain source.

Conservative Treatment

• Modifiable factor correction — smoking cessation (mandatory!), vitamin D normalization > 30 ng/ml, diabetes control (HbA1c < 7%), NSAID discontinuation, adequate nutrition (protein > 1.5 g/kg).
• Electrical stimulation / ultrasound (LIPUS) — osteogenesis stimulation. Used in early stages of nonunion without construct loosening.
• Shockwave therapy — for accessible locations.
• Bracing — external stabilization (lumbar corset for spinal pseudoarthrosis, limb brace).

Conservative treatment is effective only in early stages of delayed union without construct loosening. For established pseudoarthrosis, revision surgery is indicated.

MIBRAR® Therapy

Postoperative bone nonunion (Postoperative knöcherne Unheilbarkeit) is included in the list of indications for MIBRAR® technology. Professor Babayan's method offers microinvasive biological stimulation of healing without repeat open surgery.

MIBRAR® for postoperative nonunion:

• ARK transplantation into the nonunion zone — ARK (autologous regenerative concentrate) contains CD34+ stem cells, lipogenic mesenchymal stem cells, growth factors, and anti-inflammatory factors. Mesenchymal stem cells differentiate into osteoblasts.
• Sclerotic zone microperforations — following the MIBRAR® principle, targeted micro-injuries open channels for stem cell migration. Mimicking the effect of decortication without open surgery.
• Microinvasiveness advantage — from Prof. Babayan's book: "With a conventional incision, stem cells are spent on healing the incision." With MIBRAR®, all regenerative factors concentrate in the nonunion zone.
• Sono Control Arm™ — concentrate delivery directly to the nonunion zone with 0.1 mm accuracy, even in the presence of hardware.

Especially promising for spinal pseudoarthrosis, when repeat open surgery carries a high risk of complications (scarring, dural damage, infection).

Surgical Treatment

Revision surgery is indicated for established pseudoarthrosis, construct loosening, or hardware fracture:

1. Revision spinal fusion — fibrous tissue removal, decortication, bone graft replacement or supplementation (iliac crest autograft). Replacement of loosened screws with larger or cemented ones.
2. Fusion extension — for nonunion at cranial or caudal level — construct extension by 1–2 segments above/below.
3. Limb re-osteosynthesis — plate/nail replacement, fixation update, autologous bone grafting. For infection — staged treatment (debridement → antibiotics → reconstruction).
4. BMP (bone morphogenetic protein) — BMP-2, BMP-7 as potent osteogenesis stimulators during revision.
5. Ilizarov apparatus — for long bone nonunion with defect. Compression + bone transport.

Treatment Cost

All treatment prices in Germany.

Clinics