A Study on the Clinical Use of a New Expandable OLIF Cage With Posterior Bone Grafting in Lumbar Spine Surgery

Summary

This clinical trial aims to evaluate the safety and effectiveness of a novel expandable OLIF (Oblique Lateral Interbody Fusion) cage with posterior bone grafting in patients with lumbar degenerative diseases. OLIF is a minimally invasive spinal surgery technique that restores intervertebral height and relieves nerve compression by placing a cage into the disc space.

The new device allows surgeons to adjust the height of the cage during surgery and deliver bone grafts through a special channel after expansion. This study compares the outcomes of patients receiving the new cage versus those treated with a conventional OLIF cage.

The trial will assess pain relief, functional improvement, spinal stability, fusion success, and potential complications. Radiological images and patient-reported scores (like VAS and ODI) will be collected over 12 months. The study includes patients aged 40 to 80 with single-level lumbar spine disease who have not improved after at least 6 months of conservative treatment.

This study will help determine whether the new expandable cage offers clinical advantages and better long-term outcomes for patients undergoing OLIF surgery.

Conditions

• Lumbar Spondylolisthesis
• Degenerative Lumbar Scoliosis
• Lumbar Disc Herniation
• Lumbar Spinal Stenosis

Interventions

DEVICE

Expandable OLIF cage with posterior bone grafting

This intervention involves the use of a novel expandable OLIF cage that allows intraoperative height adjustment and posterior bone grafting through a dedicated channel. The device is designed to restore intervertebral height and lumbar lordosis while minimizing endplate injury. Bone grafts (autologous or synthetic) are delivered after expansion to enhance fusion. This design aims to reduce cage subsidence, improve fusion rates, and simplify the surgical workflow compared to conventional OLIF cages with fixed heights.

DEVICE

Conventional OLIF cage

Participants in the control group will undergo oblique lateral interbody fusion (OLIF) using a standard non-expandable interbody fusion cage. The cage has a fixed height and is inserted via the retroperitoneal approach. Bone grafts are packed into the cage prior to insertion through the anterior or lateral window. This represents the current standard practice for OLIF procedures and does not allow intraoperative height adjustment or posterior graft delivery. The procedure follows conventional OLIF surgical protocols without additional design modifications.

Sponsors & Collaborators

• The First Affiliated Hospital of Zhengzhou University

  collaborator OTHER

• Peking University People's Hospital

  collaborator OTHER

• Shanghai Jiao Tong University Affiliated Sixth People's Hospital

  collaborator OTHER

• Jinan Hospital, Xuanwu Hospital, Capital Medical University

  collaborator UNKNOWN

• Union Hospital, Tongji Medical College, Huazhong University of Science and Technology

  collaborator OTHER

• Shanghai changzheng hospital, Naval Medical University

  collaborator UNKNOWN

• The Affiliated Hospital of Qingdao University

  lead OTHER

Study Design

Allocation

RANDOMIZED

Purpose

TREATMENT

Masking

NONE

Model

PARALLEL

Eligibility

Min Age

40 Years

Max Age

80 Years

Sex

ALL

Healthy Volunteers

No

Timeline & Regulatory

Start

2025-06-10

Primary Completion

2026-06-01

Completion

2027-05-31