Periosteum and bone marrow in bone lengthening: a DEXA quantitative evaluation in rabbits

Area of Science:

• Orthopedic surgery
• Regenerative medicine
• Bone biology

Background:

• Bone lengthening procedures aim to regenerate bone tissue.
• The roles of periosteum and bone marrow in bone regeneration are critical but require further quantitative study.

Purpose of the Study:

• To quantitatively assess the distinct and combined roles of the periosteum and bone marrow-endosteum in bone lengthening.
• To compare the efficacy of four surgical strategies involving preservation or destruction of these tissues.

Main Methods:

• A rabbit femur lengthening model using external fixators was employed.
• Four groups were established based on periosteum and bone marrow preservation or destruction.
• Bone mineral content and density were measured using dual-energy x-ray absorptiometry (DXA).

Main Results:

• Periosteum preservation with bone marrow destruction (Procedure 2) resulted in the highest bone mineral content increase (127%) in the callus.
• Periosteum preservation alone yielded a larger callus with higher mineral content than bone marrow preservation alone.
• Destruction of both periosteum and bone marrow led to bone resorption, with no new bone formation.

Conclusions:

• Periosteum preservation is essential for successful bone healing and callus formation during lengthening.
• Significant bone mineral content can be achieved without bone marrow preservation, but optimal healing involves the synergistic interaction of both tissues.
• Surgical strategies should prioritize periosteum preservation for enhanced bone regeneration outcomes.