Does Demineralized Bone Matrix Enhance Tendon-to-Bone Healing after Rotator Cuff Repair in a Rabbit Model?

Area of Science:

• Orthopedic Surgery
• Biomaterials Science
• Regenerative Medicine

Background:

• Rotator cuff tears are common injuries requiring surgical repair.
• Tendon-to-bone healing is critical for successful rotator cuff repair outcomes.
• Demineralized bone matrix (DBM) is a biomaterial investigated for bone and soft tissue healing.

Purpose of the Study:

• To compare histologic outcomes of rotator cuff repair with and without demineralized bone matrix (DBM) augmentation.
• To evaluate the efficacy of DBM in promoting tendon-to-bone (TB) healing in a rabbit model.

Main Methods:

• Twenty-six rabbits underwent rotator cuff transection and repair.
• Repairs were augmented with DBM in the experimental group (n=13) and compared to a control group (n=13).
• Histologic and gross examinations of tendon entheses were performed after 8 weeks.

Main Results:

• No gross non-healing was observed in the DBM group, compared to 2/11 in the control group (p=0.421).
• Histology revealed organized collagen fibers and abundant fibrocartilage at the tendon-to-bone interface in the DBM group.
• The control group showed disorganized collagen and predominantly fibrous tissue at the interface.

Conclusions:

• DBM demonstrated positive gross and histologic results for tendon-to-bone healing in this rabbit model.
• The small sample size limits definitive conclusions.
• Further in vivo evaluation is required to guide clinical recommendations for DBM use in rotator cuff repair.