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THE FATE OF CHONDROCYTES IN ENDOCHONDRAL OSSIFICATION IN THE RABBIT

George Bentley 1; and Robert B. Greer 2

1 Department of Orthopaedic Surgery, University of Pittsburgh; Oxford, England
2 Department of Orthopaedic Surgery, University of Pittsburgh; Pitrsburgh, Pennsylvania, United States of America

1. The epiphyses of the metatarsal heads of 250-gramme rabbits were separated at the zone of cell columns, stripped of perichondrium, labelled with tritiated thymidine and transplanted into the back muscles of the same animals.

2. Endochondral ossification started in the grafts at four days, was well established by seven days and progressed until fourteen days, the end of the study.

3. Progressive passage of the label down the zone of cell columns and into the hypertrophic zone was observed.

4. The tritiated-3H thymidine label had disappeared from the cartilage cells by ten days. No labelling was observed in the bone cells at any stage.

5. It was not possible to demonstrate from the experiment that growth plate chondrocytes are precursors of osteoblasts in the process of endochondral ossification in rabbits.




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Hip, Knee, Trauma, Upper limb, Foot & Ankle, Paediatrics, Oncology, Spine, Arthroplasty, General