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Original Article

Effect of Intermittent Cyclical Etidronate Therapy on Bone Mass and Fracture Rate in Women with Postmenopausal Osteoporosis

Tommy Storm, M.D., Gorm Thamsborg, M.D., Torben Steiniche, M.D., Harry K. Genant, M.D., and Ole Helmer Sorensen, M.D., Ph.D.

N Engl J Med 1990; 322:1265-1271May 3, 1990

Abstract
Abstract

Progressive bone loss in osteoporosis results from bone resorption in excess of bone formation. We conducted a double-blind study in 66 women with postmenopausal osteoporosis of therapy with etidronate, a diphosphonate compound that reduces bone resorption by inhibiting osteoclastic activity.

The patients were randomly assigned in equal numbers to receive oral etidronate (400 mg per day) or placebo for 2 weeks, followed by a 13-week period in which no drugs were given. This sequence was repeated 10 times, for a total of 150 weeks. Daily oral supplementation with calcium and vitamin D was given throughout the study to both groups. Vertebral bone mineral content was measured by dual-photon absorptiometry; spinal radiographs were assessed to identify new vertebral fractures.

Vertebral bone mineral content increased significantly (P<0.01) after 150 weeks of etidronate therapy (5.3 percent; 95 percent confidence interval, 2.0 to 8.6; n = 20) but decreased with placebo (–2.7 percent; 95 percent confidence interval, –7.3 to 1.9; n = 20). The difference between groups was 8.0 percentage points (P<0.01; 95 percent confidence interval, 2.4 to 13.6). The rates of fracture were significantly different for the period from week 60 to week 150 between the etidronate and placebo groups (6 vs. 54 fractures per 100 patient-years; P = 0.023). No adverse clinical, biochemical, or bone histomorphometric effects of treatment were observed.

We conclude that at the end of nearly three years, etidronate therapy for postmenopausal osteoporosis results in significant increases in vertebral bone mineral content and, after approximately one year of treatment, a significant decrease in the rate of new vertebral fractures. (N Engl J Med 1990; 322:1265–71.)

Media in This Article

Figure 1Change in the Bone Mineral Content of the Lumbar Vertebrae (L-2 to L-4) in Postmenopausal Patients with Osteoporosis Who Received Intermittent Cyclical Therapy with Etidronate (Solid Circles) or Placebo (Open Circles).
Figure 2Annual Rates of Change in the Bone Mineral Content of the Lumbar Vertebrae (L-2 to L-4) in Postmenopausal Patients with Osteoporosis Who Completed 150 Weeks of Intermittent Cyclical Therapy.
Article

POSTMENOPAUSAL osteoporosis is characterized by an absolute decrease in the amount of bone, leading to fractures after minimal trauma, most frequently of the vertebrae, the proximal femur, and the distal forearm. Since the progression of bone loss is due to an imbalance between bone resorption and bone formation, with the former exceeding the latter, drugs that can inhibit resorption are attractive candidates for the treatment of osteoporosis.

Etidronate disodium (etidronate) is an oral diphosphonate compound known to reduce bone resorption through the inhibition of osteoclastic activity.1 It has been used for the treatment of Paget's disease of bone for more than a decade and has been shown to have minimal toxicity.2 , 3 In 1976, Heaney and Saville4 demonstrated that continuous treatment of osteoporosis with etidronate at a dose of 20 mg per kilogram of body weight per day for 6 to 12 months resulted in a 50 percent reduction in bone resorption and a slight but significant increase in calcium balance. However, these investigators observed a depression in bone mineralization of a similar magnitude and suggested that treatment at 5 to 10 mg per kilogram per day might produce a better separation between the effects of etidronate on bone resorption and mineralization. In 1984, Anderson and his colleagues5 reported preliminary observations on a form of "coherence therapy" for osteoporosis. The underlying concept of coherence therapy6 is that the sequential stimulation and depression of osteoclastic activity will induce a synchronization of bone resorption and formation. After the activation of osteoclasts with a pharmacologic agent such as phosphorus or parathyroid hormone, a second agent, such as etidronate, is administered for a limited time to depress osteoclastic activity. Treatment is then stopped for a time to allow for normal osteoblastic function. This cycle is repeated, and theoretically, each treatment cycle would effect a gain in bone mass. The treatment regimen used by Anderson and colleagues involved the administration of phosphorus for 3 days, followed by etidronate (5 mg per kilogram per day) for 15 days and then a medication-free period of 10 weeks; the cycle was repeated for 9 to 24 months. This intermittent cyclical treatment resulted in marked improvements in bone mass, as evaluated by bone histomorphometry.

We tested a regimen for the treatment of postmenopausal osteoporosis consisting of the intermittent cyclical administration of oral etidronate without the preactivation of osteoclasts. We report the results of a three-year, randomized, double-blind, placebo-controlled study of the effects of this treatment regimen on bone mass, the progression of vertebral deformity, the loss of height, and the rate of fracture in a group of postmenopausal women with osteoporosis.

Methods

Patients

Sixty-six postmenopausal women with osteoporosis (mean age, 68.3 years; range, 56 to 75) were enrolled in the randomized, double-blind, placebo-controlled study between October 1983 and April 1986. The study was approved by the Copenhagen and Frederiksberg ethics committee for implementation at Sundby Hospital in Copenhagen, and informed, written consent was obtained from all participants.

Inclusion in this study was based on evidence of osteoporosis, as determined by the presence of at least one but not more than four atraumatic vertebral crush fractures and radiographically confirmed demineralization of vertebrae. Patients were excluded if they had secondary causes of osteoporosis, such as hyperparathyroidism, Paget's disease of bone, or renal osteodystrophy; impairment of renal, cardiac, or thyroid function; or a history of therapy with corticosteroids, estrogens, calcitonin, calcium, or vitamin D for three months or longer during the six months preceding study entry, or any such treatment during the two months preceding study entry. Patients were also excluded if they had received fluoride or diphosphonate therapy for any disease.

The patients were assigned to one of two study groups by means of computer-generated random numbers. Patients received 400 mg (5 to 10 mg per kilogram per day) of oral etidronate (Didronel, Norwich Eaton Pharmaceuticals, Norwich, N.Y.) or placebo daily for 2 weeks, followed by a 13-week period in which no drugs were given. Daily calcium consumption from dietary sources was not recorded, and no dietary restrictions or changes were implemented during the study. To ensure adequate calcium intake, all patients received daily supplements of elemental calcium (500 mg in the form of an effervescent tablet composed of calcium lactate gluconate and calcium carbonate; Calcium-Sandoz, Sandoz Pharmaceuticals, Basel, Switzerland) and a multivitamin containing 400 IU of vitamin D throughout the 15-week study cycle. The calcium and vitamin D supplements were taken in the morning, and patients were instructed to take the study drug (i.e., etidronate or placebo) with water in the afternoon at the midpoint of a four-hour fast. All patients were to receive 10 cycles of treatment lasting 15 weeks; the total study period thus lasted 150 weeks.

Measurement of Regional Bone Mineral Content

Bone mineral content was measured at two clinically important sites with different compositions of trabecular and cortical bone, at base line and every 30 weeks thereafter. All measurements and calculations were performed by an observer who was unaware of the treatment assignment.

The bone mineral content of the lumbar spine was measured by dual-photon absorptiometry with gadolinium-153 (BMC-LAB 22a, Novo Diagnostic Systems, Bagsvaerd, Denmark) and was calculated as the sum of the scan integrals over the second, third, and fourth lumbar vertebrae and expressed as the total bone mineral content in grams of hydroxyapatite.7 Since the total bone mineral content (and not the density of bone mineral) was calculated, we did not exclude values for vertebrae with compression fractures. To ensure that similar regions were analyzed at each interval, all calculations for a patient were done with reference to a previous measurement. If a new fracture had occurred in the region of interest, the number of scan integrals was adjusted accordingly. The coefficient of variation in healthy young subjects is 2 to 3 percent, and in patients with osteoporosis 4 to 5 percent.

The regional bone mineral content of the distal nondominant forearm was measured by single-photon absorptiometry with iodine-125 (Novo GT 35, Novo Diagnostic Systems).8 The bone mineral content was calculated as the sum of the scan integrals of six scans and expressed in arbitrary units; 1 arbitrary unit corresponds to approximately 0.07 g of hydroxyapatite. The measurement site was the point at which the distance between the radius and the ulna exceeded 8 mm; the five subsequent scans were performed proximal to this site at intervals of 4 mm. Scan integrals included both the radius and ulna. The coefficient of variation in healthy young subjects is 1 to 2 percent, and in patients with osteoporosis 3 to 4 percent.

Determination of Spinal-Deformity Index and Fracture Rate

Radiographs of the thoracic (T-4 to T-12) and lumbar (L-1 to L-4) spine obtained at base line and weeks 60, 120, and 150 were evaluated by an independent radiologist who was unaware of the patient's assigned group. For each patient, a semiquantitative vertebral-deformity score9 , 10 was assigned to individual vertebrae according to the following criteria: a normal, unfractured vertebra was assigned a grade of zero; a mild fracture with a 20 to 25 percent reduction in anterior, middle, or posterior height (or all three) accompanied by a reduction in area of approximately 10 to 20 percent was assigned a grade of 1; a moderate fracture with a 25 to 40 percent reduction in any height accompanied by a reduction in area of approximately 20 to 40 percent was assigned a grade of 2; and a severe fracture with a reduction of more than 40 percent in any height and accompanying area was assigned a grade of 3. Intermediate grades (increments of 0.5) were also used as appropriate. The vertebrae were generally not measured directly; however, a patient's entire series of films was viewed simultaneously in chronologic sequence to accommodate the potential overlap in grading criteria. In scoring each vertebra, consideration was given to the configuration of the vertebral end plates (i.e., biconcavity and sharp, angular deformities) and the size and shape of the adjacent vertebrae; only definite and substantial changes in these characteristics constituted a basis for assigning a higher score on the serial films.

A spinal-deformity index (the sum of the individual vertebral-deformity scores divided by the number of vertebrae evaluated) was calculated for each patient at each evaluation (base line and weeks 60, 120, and 150); changes in the mean indexes of each group for each study interval were also calculated from the values for individual patients. In addition, the rate of new vertebral fractures per 100 patient-years was calculated for each group. Only new vertebral fractures were identified; a new fracture was deemed to have occurred if a vertebra with an earlier grade of zero was assigned a grade of 1 or higher at a subsequent study visit. Clinically overt nonvertebral fractures and the time of their occurrence during the study were also recorded.

Height

The patient's height was measured at base line and every 30 weeks thereafter in the morning.

Serum and Urine Measurements

Fasting serum chemistry profiles for ionized calcium, phosphorus, and alkaline phosphatase and urine chemistry profiles for the 24-hour excretion of hydroxyproline and creatinine were obtained at base line and every 15 weeks thereafter. Patients were not restricted to a hydroxyproline-free diet before the urine was collected.

The serum ionized calcium concentration was determined with an ion-selective electrode (ICA 1, Radiometer, Copenhagen, Denmark). Serum phosphorus and serum alkaline phosphatase levels were determined by spectrophotometry (Cobas-Mira, Roche, Basel, Switzerland). Urinary creatinine concentration was analyzed by Jaffé chromogen reaction (Astra, Beckman Instruments, Palo Alto, Calif). Urinary hydroxyproline concentration was analyzed as described by Kivirikko et al.11 by means of spectrophotometry (PU 8600, Pye Unicam, Cambridge, United Kingdom).

Bone Histomorphometric Evaluation

Biopsy samples of the transiliac crest were obtained at base line and weeks 60 and 150 for histomorphometric evaluation. The biopsy samples were removed from the standard region 2 cm below and 2 cm behind the anterior superior iliac spine12 after intravital double labeling with tetracycline (administered 14, 13, 4, and 3 days before biopsy).13 The histomorphometric analyses and the applied stereologic transformations have been described previously in detail.14 15 16 The evaluation was done by an observer who was unaware of the treatment assignment. Changes in the volume of trabecular bone, the rate of bone turnover, and selected measurements (the osteoid surface, osteoid thickness, and mineralization lag time) performed for reasons of safety are presented here.

Evaluation of Side Effects

All clinical side effects and deaths that occurred during the study were recorded, and their causes were evaluated.

Statistical Analysis

Two-tailed t-tests (P = 0.05) were used to compare group data at base line. Because a level of significance of 0.025 was used for interim analyses,17 the level was adjusted to 0.034 in the final analyses of the results to preserve an overall P value of 0.05.18 All tests were two-tailed, and the data are shown as means ±SEM. Ninety-five percent confidence intervals were calculated for the values of bone mineral content of the vertebrae and distal forearm.

Comparisons of base-line values with serial measurements determined by dualphoton and single-photon absorptiometry (weeks 90, 120, and 150) were performed within groups by one-sample t-tests, and between groups by two-sample t-tests. For each patient who completed 150 weeks of treatment, linear regression analysis (zero-intercept model) was performed on the percent changes in vertebral bone mineral content from base line as a function of the number of weeks of study. The mean slopes from the regression equations were then used to calculate the mean rate of change in bone mineral content per year for each group. The mean rates of change for the two groups were compared with a two-sample t-test.

Comparisons between groups in the changes in the spinal-deformity index were performed at each study interval by means of the Wilcoxon rank-sum test. The fracture rate per 100 patient-years was calculated for each patient on the basis of the number of new vertebral fractures occurring in the periods from base line to week 150, base line to week 60, and week 60 to week 150. The Wilcoxon rank-sum test was used to compare the fracture rate in the groups. Although these data were analyzed by nonparametric methods, the mean fracture rate per 100 patient-years is provided for comparison with the results of other studies.

Comparisons of changes within groups and between groups in height, serum levels of alkaline phosphatase, and the ratio of urinary hydroxyproline to urinary creatinine were evaluated with one-sample and two-sample t-tests as appropriate. Changes in bone histomorphometric values were evaluated with the Wilcoxon rank-sum test.

Results

The demographic and base-line clinical features of the study patients are presented in Table 1Table 1Demographic and Base-Line Clinical Characteristics of Postmenopausal Patients with Osteoporosis at Study Entry.*. At entry, the groups were comparable in age, time since menopause, height, weight, bone mineral content of the vertebrae and distal forearm, spinal-deformity index, and biochemical markers of bone turnover. Of the 66 patients initially enrolled, 13 in the etidronate group and 13 in the placebo group left the study because of noncompliance with the study regimen (1 and 0, respectively), intercurrent illness (2 and 2), voluntary withdrawal (5 and 6), or death (5 and 5).

Bone Mineral Content

Figure 1Figure 1Change in the Bone Mineral Content of the Lumbar Vertebrae (L-2 to L-4) in Postmenopausal Patients with Osteoporosis Who Received Intermittent Cyclical Therapy with Etidronate (Solid Circles) or Placebo (Open Circles). shows the changes in the mean bone mineral content of vertebrae during the study period. A significant increase (P<0.01) from base line to week 150 was seen in the etidronate group (5.3 percent; 95 percent confidence interval, 2.0 to 8.6); the decrease in bone mineral content from base line to week 150 in the placebo group (−2.7 percent; 95 percent confidence interval, −7.3 to 1.9) was not statistically significant. The difference between the groups was 8.0 percent (P<0.01; 95 percent confidence interval, 2.4 to 13.6).

Regression analysis of the percent change in vertebral bone mineral content from base line as a function of the number of weeks of study for the patients who completed 150 weeks of the study showed a significant difference (P = 0.001) between the mean rates of change in the etidronate (n = 20) and placebo (n = 20) groups (2.2 and −1.4 percent per year, respectively; 95 percent confidence intervals, 1.0 to 3.4 and −3.0 to 0.2, respectively) (Fig. 2Figure 2Annual Rates of Change in the Bone Mineral Content of the Lumbar Vertebrae (L-2 to L-4) in Postmenopausal Patients with Osteoporosis Who Completed 150 Weeks of Intermittent Cyclical Therapy.). According to an arbitrary criterion for response to treatment (i.e., a positive slope of the regression equation), the rate of response in the etidronate group was 85 percent (17 of 20 patients) and 30 percent (6 of 20 patients) in the placebo group.

At week 150, the mean percent change in the bone mineral content of the distal forearm was not significantly different from zero in either the etidronate group (1.5 percent; 95 percent confidence interval, − 3.5 to 6.5; n = 20) or the placebo group (−3.6 percent; 95 percent confidence interval, −7.4 to 0.2; n = 20) (Fig. 3Figure 3Change in the Bone Mineral Content of the Nondominant Distal Forearm in Postmenopausal Patients with Osteoporosis Who Received Intermittent Cyclical Therapy with Etidronate (Solid Circles) or Placebo (Open Circles).). The difference between the groups was 5.1 percent (95 percent confidence interval, −1.1 to 11.3).

Spinal-Deformity Index and Fracture Rate

During the first 60 weeks of treatment, a similar rate of deterioration in vertebral integrity, as represented by increasing mean spinal-deformity indexes, was observed in the two groups; thereafter, however, the mean index remained relatively constant in the etidronate group but rose progressively in the placebo group. The difference between the groups in terms of the change in the spinal-deformity index from base line was significant at week 150 (P = 0.028) (Fig. 4Figure 4Change in the Spinal-Deformity Index in Postmenopausal Patients with Osteoporosis Who Received Intermittent Cyclical Therapy with Etidronate (Solid Circles) or Placebo (Open Circles).).

No significant difference between the etidronate and placebo groups was observed in the rate of new vertebral fractures for the period from base line to week 150 (18 and 43 per 100 patient-years, respectively) or from base line to week 60 (38 and 35 per 100 patient-years, respectively); however, the rates for the period from week 60 to week 150 were significantly different (6 and 54 per 100 patient-years, respectively; P = 0.023).

Spontaneous and traumatic nonvertebral fractures occurred in both groups during the study. Six patients receiving placebo had a total of 10 nonvertebral fractures (forearm, 3; hip, 2; humerus, 2; pelvis, 1; maxillary, 1; and sternum, 1), and five patients receiving etidronate had a total of 6 nonvertebral fractures (forearm, 2; femur, 1; hip, 1; rib, 1; and finger, 1). Among the patients who received placebo, seven nonvertebral fractures were reported during or before week 60 of the study, two during week 90, and one during week 135. All nonvertebral fractures in the patients who received etidronate occurred before week 60.

Height

The mean changes in height in both groups were significantly different from zero (P<0.01); however, there was less loss of height in the etidronate group than in the placebo group (−1.1 ±0.3 vs. −1.9±0.4 cm) (Fig. 5Figure 5Change in Height in Postmenopausal Patients with Osteoporosis Who Received Intermittent Cyclical Therapy with Etidronate (Solid Circles) or Placebo (Open Circles).). The difference between the two groups was not statistically significant (P = 0.15).

Biochemical Analyses

The mean serum levels of calcium were unchanged in both groups over the 150-week study period. Serum phosphorus levels in the placebo group were stable during the study period, whereas levels in the etidronate group showed minimal increases at the end of the two-week administration period during each treatment cycle (data not shown); such increases are consistent with the known pharmacologic action of this diphosphonate in increasing the tubular reabsorption of phosphate by the kidney.2 Significant decreases (P<0.01) in the serum levels of alkaline phosphatase were observed in the etidronate group at weeks 30, 60, 120, and 150, whereas no significant changes occurred in the placebo group during the study. The difference between the groups in the mean levels of this biochemical marker of bone turnover was significant (P<0.02) at week 150. No changes in the ratio of urinary hydroxyproline to urinary creatinine were noted in either group at any time; these results were most likely due to the 24-hour urine collections and to the absence of dietary restrictions before urine collection.

Bone Histomorphometric Evaluation

Biopsy samples of bone were obtained from all patients in the study. However, usable biopsy samples were obtained at both week 0 and week 60 only in 20 patients treated with etidronate and 21 given placebo; usable samples were obtained at both week 0 and week 150 in 14 patients treated with etidronate and 15 given placebo. No change from base line in the mean volume of trabecular bone was found at either time in the two groups. Etidronate treatment did not result in an accumulation of unmineralized bone, as evidenced by the lack of change in osteoid surface and thickness. The mineralization lag time (i.e., the average lag time between the formation and subsequent mineralization of osteoid) also remained unchanged. Thus, no signs of osteomalacia could be detected after either 60 or 150 weeks of etidronate treatment.

After 60 weeks of etidronate treatment, a significant decrease (−58 percent; P<0.02) in the rate of bone turnover was observed. After 150 weeks of treatment, the rate of bone turnover appeared to return toward base line (−11 percent as compared with base line values; P>0.05). In the placebo group, no change in the rate of bone turnover was seen at week 60, but a significant increase was observed after 150 weeks (79 percent; P<0.02).

Side Effects

Oral etidronate was well tolerated; no significant side effects related to the study drug were observed. Serial serum and urine assays revealed no significant, unexplained, or unanticipated abnormalities. Ten deaths (5 in each treatment group) occurred during the study but were not related to the study drugs or to the patients' osteoporosis.

Discussion

The results of our study demonstrate that intermittent cyclical therapy with oral etidronate is effective in reversing the progressive loss of vertebral bone that occurs in postmenopausal osteoporosis. By measuring bone mass at two clinically relevant sites, the vertebrae and distal forearm, we were able to evaluate the effects in areas with predominantly trabecular and cortical bone, respectively. In the patients who received etidronate, the significant increases in vertebral bone mineral content were accompanied by small but not statistically significant increases in the bone mineral content of the forearm, suggesting that the increases in trabecular bone mass were not attained at the expense of cortical bone mass.

The course of the response in the etidronate group over time, as assessed by changes in vertebral bone mineral content, is in accordance with that reported by other trials in which antiresorptive agents have been administered: an early increase in bone mass was followed by a plateau.19 20 21 22 23 Two different mechanisms may be involved. Parfitt24 postulated that the increase in bone mineral content may be due to a decrease in bone remodeling as the resorption cavities are filled in. Once the empty resorption cavities are filled, no further increment in bone mass occurs, and the plateau effect is observed. Furthermore, a decrease in the rate of bone turnover naturally leads to an increase in the mean age of the bone, and since older bone is more heavily mineralized, the bone mineral content may increase. Since continuous oral treatment with high doses of etidronate may lead to the impairment of bone mineralization and the cessation of bone remodeling,4 , 25 a more ideal therapeutic regimen might consist of the intermittent cyclical administration of the diphosphonate in a dose that inhibits bone resorption yet does not prevent mineralization. Although we do not know whether the dose and treatment regimen used in our study are optimal, our results are encouraging. We could detect no signs of osteomalacia after either 60 or 150 weeks of treatment with etidronate.

Several other studies have been completed5 , 23 , 26 , 27 or are under way22 in which etidronate is administered cyclically and intermittently as part of a regimen of coherence therapy. Reports of increases in bone mass in studies in which coherence therapy with phosphorus and etidronate has been used22 , 23 are consistent with the results of our study, suggesting that the use of phosphorus in the treatment regimen may not be essential for the effect. Unlike other potential inhibitors of bone resorption, such as calcitonin, etidronate may have a prolonged action on bone despite intermittent administration. Because diphosphonates are adsorbed onto bone and are resistant to hydrolysis, the activation of osteoclasts with phosphorus may theoretically be counteracted when etidronate first is adsorbed onto bone. Thus, the results of coherence-therapy studies that used diphosphonates as the antiresorbing agents could be due to the effects of the diphosphonates alone.

Pacifici and coworkers reported that intermittent treatment with phosphorus and etidronate did not prevent the loss of vertebral bone.26 Because they administered etidronate and calcium twice daily (and even though patients were instructed not to take the etidronate with meals or with the calcium tablets), it is possible that the absence of efficacy was due to diminished absorption of etidronate. Only 1 to 9 percent of a single dose of etidronate is absorbed, and absorption is further diminished by the presence of calcium and dairy products.3 , 28 Therefore, it seems of major importance that etidronate be taken with water at the midpoint of a four-hour fast.

Intermittent cyclical therapy with etidronate induced an increase in the bone mineral content of vertebrae, followed by a reduction in the rate of deterioration of vertebral integrity (as measured by the spinal-deformity index) and the rate of vertebral fracture. Compression fractures of the vertebral bodies are the result of a weakening of the trabecular structure due to the thinning or perforation of already compromised trabecular plates and rods.29 In patients who already have some fractured vertebrae, it must be assumed that the remaining intact vertebrae are also perilously close to fracture. We were unable to demonstrate an increase in the volume of trabecular bone, as assessed by bone histomorphometry, and it can therefore be inferred that intermittent cyclical treatment with etidronate maintains the mechanical competence of critical structural elements in bone or otherwise prevents their further compromise. In our study, histomorphometric analyses of bone showed a significant decrease in the rate of bone turnover after 60 weeks of etidronate therapy. The apparent return toward base line after 150 weeks probably represents a regional acceleration of turnover, since both the first biopsy samples (week 0) and the third biopsy samples (week 150) were obtained from the right iliac crest and an increase in the rate of turnover was noted in the placebo group after 150 weeks. We suggest that the overall reduction in the rate of bone turnover in the etidronate group was followed by a reduction in the rate of new perforations of bone structural elements and thus helped prevent further vertebral deformities and fractures. Furthermore, because of the long remodeling cycle in osteoporosis, the effects of antiresorptive agents such as etidronate are not likely to be fully appreciated during the first year of treatment. This is consistent with the results of our study. The degree of protection afforded appears to depend on the duration of therapy, since it is much higher during the second and third years of treatment and results in the prevention of new vertebral fractures.

In summary, intermittent cyclical therapy with oral etidronate results in small but significant increases in the bone mineral content of vertebrae and, after approximately one year of treatment, a stabilization in the progression of spinal deformity and a significant decrease in the rate of new vertebral fractures.

Supported by a research grant from Norwich Eaton Pharmaceuticals, a Procter & Gamble company.

We are indebted to Ms. Eva Hermann, Ms. Birgit Ludvigsen, and Ms. Ulla Pedersen for their skillful technical assistance and to the Departments of Radiology and Clinical Chemistry at Sundby Hospital.

Source Information

From the Department of Medicine, Sundby Hospital, Copenhagen, Denmark (T. Storm, G.T., O.H.S.); the University Institute of Pathology, Aarhus Amtssygehus, Aarhus, Denmark (T. Steiniche); and the Departments of Radiology, Medicine, and Orthopedic Surgery, University of California, San Francisco (H.K.G.). Address reprint requests to Dr. Storm at the Department of Medicine, Sundby Hospital, 2300 Copenhagen S, Denmark.

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