Sorry I missed your post. I will get back to you this afternoon. I'm in lecture right now :redface:
In general though. If the tendon is tracking off the head of the Metacarpal, also known as subluxing, surgery is required. Here's a list of a few good articles. I can't give you the actual papers, but if you go to your local university or library, you should be able to access most of these through PubMed or Google Scholar
9. Melone Jr., Charles P., Daniel B. Polatsch, and Steven Bender. "Disabling Hand Injuries in Boxing: Boxer's Knuckle and Traumatic Carpal Boss." Clinical Sports Medicine (2009): 609-21. Print.
10. Gambrell, Robert Chul. "Boxing: Medical Care in and Out of the Ring." Current Sports Medicine Reports 6 (2007): 317-21. Print.
11. Hame, Sharon L., and Charles P. Melone Jr. "Boxer's Knuckle in the Professional Athlete." The American Journal of Sports Medicine 28.6 (2000): 879-82. Print.
12. Hames, Sharon L., and Charles P. Melone Jr. "Boxer's Knuckle- Traumatic Disruption of the Extensor Hood." Hand Clinics 16.3 (2000): 375-80. Print.
13. Bents, Robert T., John P. Metz, and Steven M. Topper. "Traumatic Extensor Tendon Dislocation in a Boxer: A Case Study." Medicine and Science in Sports and Exercise 35.10 (2003): 1645-647. Print.