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Updated: Feb 14, 2026

Evaluation of Stem Cell Therapies in a Bilateral Patellar Tendon Injury Model in Rats
Published on: March 30, 2018
Extensive Bilateral Patellar Tendon Ossification in a Spinal Cord Injury Patient
Norio Yamamoto1, Takaaki Miki, Akihiro Nishiyama
1Department of Orthopedic Surgery, Unnan City Hospital, Unnan, Shimane 699-1221, Japan.norio-yamamoto@umin.ac.jp.
Abstract:
This is the first report of extensive bilateral patellar tendon ossification occurring over a prolonged time after a unilateral knee injury. An 84-year-old Japanese man with a spinal cord injury caused by a burst fracture of the T12 vertebra presented with a bony hard prominence on the left knee, which was injured in a traffic accident when he was 77 years old. Radiography revealed extensive ossification of the bilateral patellar tendons. We review the English literature with a focus on the localization of bilateral heterotopic ossification of the knee in patients who had a central nervous system injury.
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