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Aggressive osteoblastoma of the left calcaneus in 29‐year‐old Japanese woman is reported. Her initial symptom was heel pain while walking. This was a primary calcaneal tumor, initially diagnosed as a benign osteoblastoma. After a 5‐year follow‐up (from the initial curettage), there was local recurrence. The histologic findings of aggressive osteoblastoma were confirmed after right lower leg amputation. The recurrent tumor was mildly aggressive to the talocalcanean joint and the retrocalcaneal area, without distant metastasis. The characteristics of the primary and recurrent tumors were examined by the radiologic, histologic, and electron microscopic procedures. Although there are questions about aggressive osteoblastoma, the authors believe that there are osteoblastic tumors of borderline malignancy between benign osteoblastoma and low‐grade osteosarcoma. The current case was an example compatible with an aggressive osteoblastoma with the proposed name of Dorfman classification Group 4.

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Thirty-seven Cases with chronic low back pain were treated by developing the abdominal muscles exercise. They were classfied into two groups. Eighteen cases (A) who could sit up from 25 to 30 times with the hands clasped behind the head and knees flexed , showed improvement of the low back pain (71.2%), the leg pain (52.9%) and the constipation (75%). The other group (B) that could sit up less than 25 times, also showed improvement but it was less than that of the former group .