Journal of Sports Science and Medicine
Journal of Sports Science and Medicine
ISSN: 1303 - 2968   
Ios-APP Journal of Sports Science and Medicine
Androit-APP Journal of Sports Science and Medicine
from September 2014
©Journal of Sports Science and Medicine (2012) 11, 238 - 244

Research article
The Effects of an Early Return to Training on the Bone-Tendon Junction Post-Acute Micro-Injury Healing
Lin Wang1, Weiwei Gao1, Kaiyu Xiong2, Ning Liu3, Bo Wang3
Author Information
1 Section of Sports Medicine,
2 Teaching Experiment Research Centre,
3 College of Post-Graduated Student, Beijing Sport University, Beijing, China
Publish Date
Received: 03-10-2011
Accepted: 03-02-2012
Published (online): 01-06-2012
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Bone-tendon junction (BTJ) overuse injuries are common athletic and occupational problems. BTJ injuries may sometimes be caused by resuming training too early after injury. To study the effects of post-injury resuming training within 48 hours on the acute injury healing process, as it is often the case for athletes. Twelve mature female rabbits were assigned to one of the following groups: acute injury (AI, n = 6), post-injury early return to training (PIERT, n = 6) and normal control (CON, n = 6). Tissue specimens were harvested at week 4. The radiological and histological characteristics of the AI and PIERT groups were compared among the groups. The trabecular thickness of the PIERT group was significantly different from those of the AI and CON group. A histological evaluation revealed poor collagen fibre alignment, extensive scar tissue and lowered cell density in the AI and PIERT groups compared with the CON group, but no significant differences were observed between the AI group and the PIERT group. The fibrocartilage zone and proteoglycan area in the PIERT group were significantly different from those in AI group. No differences were observed in the Total VOI volume (TV), Object volume (OBV), Percent object volume (BV/TV) and trabecular number (Tb.N) among the AI, PIERT and CON groups. In conclusion, a repeatable animal model of bone-tendon junction acute micro-damage by puncture was established. Resuming training in 48 hours did not significantly deteriorate the BTJ injury healing, but improved bone remodelling and increased fibrocartilage zone thickness.

Key words: Bone-tendon junction, Patella, quantitative loading, early return to training, injury healing

           Key Points
  • An easy and repeatable bone-tendon junction injury model was established in this study, it will provide a platform to the injury research.
  • Post-injury resuming training in 48 hours did not delay the acute bone-tendon junction injury healing process, it provided a basic theory for the post-injury training.
  • To find the proper post-injury training intensity will help athletes to train scientifically, it is the destination of our next research.
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