Amino-bisphosphonates in heterotopic ossification: first experience in five consecutive cases.
METHODS
Retrospective, observational study in five consecutive cases.


OBJECTIVE
The management of heterotopic ossification (HO), a frequent complication after spinal cord injury (SCI) and after orthopaedic surgery, is a therapeutic challenge with high recurrence rates of over 50%. Conflicting data were reported for Etidronate. The use of the more potent new generation of amino-bisphosphonates has been put forward in different inflammatory, dysmorphogenic bone disease. In order to try and halt the underlying dysfunctional bone metabolism we have studied the action of pamidronate in five consecutive high-risk patients with established HO of different etiology undergoing surgical removal.


METHODS
University Hospital of Basel, Switzerland, Division of Endocrinology, Diabetology and Clinical Nutrition and the Department of Orthopedic Surgery.


METHODS
In all five patients, ranging from 47 to 68 years of age, we used continuous pamidronate infusions perioperatively at a dosage of 120 mg in the first 12 h and subsequent reduction to 75-60-30-15 mg/12 h over a period of 10-14 days.


RESULTS
None of these patients showed clinical, radiographical and laboratory signs of HO recurrence or new forming HO in the follow-up 5-54 month after surgery. Potential side effects of high-dose bisphosphonate therapy such as osteoporosis and osteomalacia were not reported in any case.


CONCLUSIONS
We postulate that pamidronate might have pronounced beneficial effects in high-risk patients with established HO undergoing excision surgery. Since the therapeutic window of amino-bisphosphonates has not yet been defined and the minimal necessary doses for preventing new HO are unknown, further studies are encouraged to confirm our findings and to identify the necessary dosage and duration of treatment and to pinpoint, which patients will benefit most from this treatment.
Schuetz
P
P
Department of Internal Medicine, Division of Endocrinology, Diabetology and Clinical Nutrition, University Hospital, Basel, Switzerland.
Mueller
B
B
Christ-Crain
M
M
Dick
W
W
Haas
H
H
D000368:Aged; D000893:Anti-Inflammatory Agents / Q000008:administration & dosage; D050071:Bone Density Conservation Agents / Q000627:therapeutic use*; D004164:Diphosphonates / Q000008:administration & dosage / Q000627:therapeutic use*; D004334:Drug Administration Schedule; D005500:Follow-Up Studies; D006801:Humans; D008297:Male; D008875:Middle Aged; D019370:Observation; D009999:Ossification, Heterotopic / Q000188:drug therapy* / Q000209:etiology; D000077268:Pamidronate; D012189:Retrospective Studies; D013119:Spinal Cord Injuries / Q000150:complications / Q000601:surgery; D013997:Time Factors; D016896:Treatment Outcome
D000893:Anti-Inflammatory Agents; D050071:Bone Density Conservation Agents; D004164:Diphosphonates; D000077268:Pamidronate