Effects of Abaloparatide or Placebo on Bone Mineral Density in Acetabular Regions Corresponding to DeLee and Charnley Zones in Postmenopausal Women with Osteoporosis

IF 1.7 4区 医学 Q4 ENDOCRINOLOGY & METABOLISM
Neil P. Sheth MD (Contributing Author) , Mathias P. Bostrom MD (Contributing Author) , Renaud Winzenrieth PhD (Contributing Author Speaker Biography) , Ludovic Humbert PhD (Contributing Author) , Leny Pearman PhD (Contributing Author) , John Caminis MD (Contributing Author) , Yamei Wang PhD (Contributing Author) , John I. Boxberger PhD (Primary Author) , Kelly Krohn MD (Contributing Author)
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引用次数: 0

Abstract

Purpose/Aims

To evaluate the effects of 6 and 18 mo of abaloparatide (ABL) compared with placebo (PBO) on bone mineral density (BMD) in the acetabular regions of postmenopausal women with osteoporosis (OP).

Rationale/Background

Acetabular bone loss, as may occur in OP, increases risk of acetabular fragility fractures and is associated with significant morbidity. In total hip arthroplasty (THA), low acetabular BMD adversely affects primary stability, osseointegration, and migration of acetabular cups. ABL is an osteoanabolic agent for the treatment of men and postmenopausal women with OP at high risk for fracture that increases BMD of the total hip, femoral neck, trochanter, and lumbar spine. Effects of ABL on acetabular BMD are unknown.

Methods

Hip DXA scans were obtained at baseline, 6, and 18 mo from a random subgroup of postmenopausal women (aged 49–86 y) from the phase 3 ACTIVE trial randomized to either ABL 80 µg/d or PBO (n=250/group).

Anatomical landmarks were identified in each DXA scan to virtually place a hemispherical shell model of an acetabular cup and define regions of interest corresponding to DeLee & Charnley zones 1 (R1), 2 (R2), and 3 (R3). BMD changes compared to baseline were calculated for each zone. Statistical P values were based on a mixed-effect repeated measure model adjusted for BMI, age, and baseline BMD, with covariates including DXA scanner type, treatment group, visit, and treatment/visit interaction. DXA scans were aligned via intensity-based registration onto a reference scan to depict local mean changes in BMD.

Results

BMD in all zones were similar at baseline in the ABL and PBO groups. BMD significantly increased in the ABL group at 6 and 18 mo compared with PBO (all P< 0.0001 vs PBO; Figure), with mean BMD increasing from baseline by 8.38% in R1, 7.25% in R2, and 9.73% in R3 at 18 months. BMD in the PBO group was relatively stable over time.

Implications

Treatment with ABL resulted in rapid and progressive increases in BMD of all 3 acetabular zones. Increasing acetabular BMD has the potential to improve acetabular strength, which may reduce risk of acetabular fragility fractures. With bone health optimization prior to THA, increased acetabular BMD via ABL may provide better primary stability and longevity of acetabular cups in postmenopausal women with OP.

阿巴巴拉肽或安慰剂对绝经后骨质疏松症妇女髋臼区DeLee和Charnley区骨密度的影响
目的/目的与安慰剂(PBO)相比,评估6个月和18个月的阿巴洛肽(ABL)对绝经后骨质疏松症(OP)妇女髋臼区骨密度(BMD)的影响。理由/背景OP中可能发生的髋臼骨丢失会增加髋臼脆性骨折的风险,并与显著的发病率相关。在全髋关节置换术(THA)中,髋臼骨密度低会对髋臼杯的初始稳定性、骨整合和迁移产生不利影响。ABL是一种骨合成代谢剂,用于治疗男性和绝经后女性OP骨折高风险患者,可增加髋关节、股骨颈、大转子和腰椎的BMD。ABL对髋臼骨密度的影响尚不清楚。方法在基线、6个月和18个月时,从3期ACTIVE试验中随机分组的绝经后妇女(年龄49-86岁)中获得髋关节DXA扫描,随机分组为ABL 80µg/d或PBO(n=250/组);Charnley区1(R1)、2(R2)和3(R3)。计算每个区域与基线相比的BMD变化。统计P值基于经BMI、年龄和基线BMD调整的混合效应重复测量模型,协变量包括DXA扫描仪类型、治疗组、就诊和治疗/就诊交互作用。DXA扫描通过基于强度的配准与参考扫描对齐,以描述BMD的局部平均变化。结果ABL和PBO组所有区域的BMD在基线时相似。与PBO相比,ABL组在6个月和18个月时的BMD显著增加(所有P<0.0001 vs PBO;图),18个月后,R1组的平均BMD比基线增加8.38%,R2组增加7.25%,R3组增加9.73%。PBO组的BMD随着时间的推移相对稳定。并发症ABL治疗导致所有3个髋臼区的BMD快速且渐进地增加。增加髋臼骨密度有可能提高髋臼强度,从而降低髋臼脆性骨折的风险。在THA之前进行骨健康优化,通过ABL增加髋臼BMD可以为绝经后OP妇女提供更好的髋臼杯初始稳定性和寿命。
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来源期刊
Journal of Clinical Densitometry
Journal of Clinical Densitometry 医学-内分泌学与代谢
CiteScore
4.90
自引率
8.00%
发文量
92
审稿时长
90 days
期刊介绍: The Journal is committed to serving ISCD''s mission - the education of heterogenous physician specialties and technologists who are involved in the clinical assessment of skeletal health. The focus of JCD is bone mass measurement, including epidemiology of bone mass, how drugs and diseases alter bone mass, new techniques and quality assurance in bone mass imaging technologies, and bone mass health/economics. Combining high quality research and review articles with sound, practice-oriented advice, JCD meets the diverse diagnostic and management needs of radiologists, endocrinologists, nephrologists, rheumatologists, gynecologists, family physicians, internists, and technologists whose patients require diagnostic clinical densitometry for therapeutic management.
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