Developing an international competency and capability framework for advanced practice physiotherapy: a scoping review with narrative synthesis

INTRODUCTION

The need to address increasing numbers of people seeking care, insufficient numbers of physicians, and providing high-value and sustainable care has contributed to changing physiotherapy practice across the world, often referred to as advanced practice physiotherapy. Currently, there is no internationally standardized competency and capability framework to support advanced practice physiotherapy.

OBJECTIVES

This scoping review has two aims; 1) To identify and map out the competencies of advanced practice physiotherapy available in the literature. 2) To develop a competency and capability framework by mapping the competencies identified from the review.

DESIGN

The Arksey and O'Malley framework and the PRISMA Scoping review methodology were used. Databases searched included CINAHL Plus, MEDLINE Ovid, PubMed, and Scopus. The competency and capability framework was developed through a narrative synthesis approach.

RESULTS

Nineteen documents were included in the final review, with 13 grey literature (government reports, policy documents, thesis) and six research papers. Included publications came from the United Kingdom, Ireland, Australia, New Zealand, and Canada. The included documents covered predominantly musculoskeletal practice (n = 17). The others focused on cardiorespiratory care, incontinence and pelvic health. Through narrative synthesis, 27 competencies and capabilities were identified and grouped under seven domains.

CONCLUSION

The synthesis of this scoping review provides the first competency and capability framework for advanced practice physiotherapy that integrates competencies and capabilities from five different countries. With the expansion of advanced practice physiotherapy, the framework developed from this review is the first step towards international recognition, standardization and consistency of education and training of practitioners. CONTRIBUTION OF THE PAPER.

Developing a core competency and capability framework for advanced practice physiotherapy: A qualitative study

INTRODUCTION

There is an urgent need to develop an international competency and capability framework to support standardization of education and roles in advanced practice physiotherapy (APP). This need arose due to the rapid growth of the APP model of care, implemented out of necessity in the absence of agreement as to the competencies and capabilities or formal education required for the roles. This study explores the views and perceptions of practitioners and key stakeholders on a draft competency and capability framework for advanced practice physiotherapists.

OBJECTIVES

The purpose of this study was to: 1) gather feedback from key stakeholders (advanced practice physiotherapists, researchers, and leaders) on a draft competency and capability framework and 2) use that feedback to revise and improve the draft framework.

DESIGN

Qualitative study using a series of four multi-national online focus groups. Thematic analysis was conducted according to Braun and Clarke.

RESULTS

Sixteen participants from the United Kingdom, Ireland, Canada, Australia, and New Zealand participated in the study. Five themes were generated after data analysis: clinical expert, experienced communicator, strong leader, collaborator, and knowledge creator). A modified competency and capability framework was developed based on feedback from the focus groups and input from subject matter experts (SMEs).

CONCLUSION

This study provides a modified core competency and capability framework comprising 24 competencies grouped under six domains. This study is a step toward international standardization of advanced practice physiotherapy based on a commonly agreed framework for the education and training of advanced practice physiotherapists.

An Advanced Clinician Practitioner in Arthritis Care (ACPAC) Maintains a Positive Patient Experience While Increasing Capacity in Rheumatology Community Care

Purpose

This study describes patient care experiences of solo-rheumatologist and co-managed care models utilizing an Advanced Clinician Practitioner in Arthritis Care-trained Extended Role Practitioner (ACPAC-ERP) in three community rheumatology practices.

Materials and Methods

Patients with inflammatory arthritis (IA) were assigned to care provided by one of three (2 senior, 1 early-career) community-based rheumatologists (usual care), or an ACPAC-ERP (co-managed care) for the 6-months following diagnosis. Patient experiences were surveyed using validated measures of patient satisfaction (Patient Doctor Interaction Scale-PDIS), global ratings of confidence and satisfaction, referral patterns, disease activity (RADAI) and self-perceived disability (HAQ-Disability) as well as demographic information. Practice capacity was evaluated 18-months prior to, and across, the study period.

Results

Of 55 participants (mean age 56.6 years, 61.8% female), 33 received co-managed care. Most participants were diagnosed with rheumatoid arthritis (65.5%) with a median symptom duration of 1.1 years. At 6-months, patients from both models of care were equally satisfied in terms of the information provided (usual care 4.6 vs co-managed care 4.7/5=greater satisfaction), rapport with health-care provider (4.6 vs 4.6/5) and having needs met (4.7 vs 4.5/5). Overall satisfaction was high (87.2 vs 85.3/100=completely satisfied) as was confidence in the system by which care was received (85.0 vs 82.1/100=completely confident). Usual care patients reported higher perceived disability than co-managed patients (HAQ-Disability 0.5 vs 0.2/3=unable to do). Significant differences in overall RADAI score (p=0.014) were found between the two models. The senior rheumatologist, with a previously saturated practice, attained a 37% capacity increase for new patients utilizing the co-managed care model.

Conclusion

The ACPAC-ERP model was equivalent to the solo-rheumatologist model with regard to patient experience and satisfaction. A co-management model utilizing a highly trained ACPAC-ERP can increase capacity in community rheumatology clinics for patients newly diagnosed with IA while maintaining confidence and satisfaction with their care.

Measuring Advanced/Extended Practice Roles in Arthritis and Musculoskeletal Care in Canada

Objective

Our objective was to characterize Canadian workforce attributes of extended role practitioners (ERPs) in arthritis care.

Methods

We used an exploratory, mixed‐methods study that was based on the Canadian Rheumatology Association's Stand Up and Be Counted Rheumatologist Workforce Survey (2015). An anonymous online survey was deployed to groups of non‐physician health care professionals across Canada who potentially had post‐licensure training in arthritis care. Demographic and practice information were elicited. Qualitative responses were analyzed using grounded theory techniques.

Results

Of 141 respondents, 91 identified as practicing in extended role capacities. The mean age of ERP respondents was 48.7; 87% were female, and 41% of ERPs planned to retire within 5 to 10 years. Respondents were largely physical or occupational therapists by profession and practiced in urban/academic (46%), community (39%), and rural settings (13%). Differences in practice patterns were noted between ERPs (64.5%) and non‐ERPs (34.5%), with more ERPs working in extended role capacities while retaining activities reflective of their professional backgrounds. Most respondents (95%) agreed that formal training is necessary to work as an ERP, but only half perceived they had sufficient training opportunities. Barriers to pursuing training were varied, including personal barriers, geographic barriers, patient‐care needs, and financial/remuneration concerns.

Conclusion

To our knowledge, no previous studies have assessed the workforce capacity or the perceived need for the training of ERPs working in arthritis and musculoskeletal care. Measurement is important because in these health disciplines, practitioners’ scopes of practice evolve, and ERPs integrate into the Canadian health care system. ERPs have emerged to augment provision of arthritis care, but funding for continuing professional development opportunities and for role implementation remains tenuous.

An advanced clinician practitioner in arthritis care can improve access to rheumatology care in community-based practice

OBJECTIVE

To facilitate access and improve wait times to a rheumatologist's consultation, this study aimed to 1) determine the ability of an advanced clinician practitioner in arthritis care (ACPAC)-trained extended role practitioner (ERP) to triage patients with suspected inflammatory arthritis (IA) for priority assessment by a rheumatologist and 2) determine the impact of an ERP on access-to-care as measured by time-to-rheumatologist-assessment and time-to-treatment-decision.

MATERIALS AND METHODS

A community-based ACPAC-trained ERP triaged new referrals for suspected IA. Patients with suspected IA were booked to see the rheumatologist on a priority basis. Diagnostic accuracy of the ERP to correctly identify priority patients; the level of agreement between ERP and rheumatologist (Kappa coefficient and percent agreement); and the time-to-treatment-decision for confirmed cases of IA were investigated. Retrospective chart review then compared time-to-rheumatologist-assessment and time-to-treatment-decision in the solo-rheumatologist versus the ERP-triage model.

RESULTS

One hundred twenty-one patients were triaged. The ERP designated 54 patients for priority assessment. The rheumatologist confirmed IA in 49/54 (90.7% positive predictive value [PPV]). Of the 121 patients, 67 patients were designated as nonpriority by the ERP, and none were determined to have IA by the rheumatologist (100% negative predictive value [NPV]). Excellent agreement was found between the ERP and the rheumatologist (Kappa coefficient 0.92, 95% CI: 0.84-0.99). In the ERP-triage model, time-from-referral-to-treatment-decision for patients with IA was 73.7 days (SD 40.4, range 12-183) compared with 124.6 days (SD 61.7, range 26-359) in the solo-rheumatologist model (40% reduction in time-to-treatment-decision).

CONCLUSION

A well-trained and experienced ERP can shorten the time-to-Rheumatologist-assessment and time-to-treatment-decision for patients with suspected IA.

Stand Up and Be Counted: Measuring and Mapping the Rheumatology Workforce in Canada

OBJECTIVE

To characterize the practicing rheumatologist workforce, the Canadian Rheumatology Association (CRA) launched the Stand Up and Be Counted workforce survey in 2015.

METHODS

The survey was distributed electronically to 695 individuals, of whom 519 were expected to be practicing rheumatologists. Demographic and practice information were elicited. We estimated the number of full-time equivalent rheumatologists per 75,000 population from the median proportion of time devoted to clinical practice multiplied by provincial rheumatologist numbers from the Canadian Medical Association.

RESULTS

The response rate was 68% (355/519) of expected practicing rheumatologists (304 were in adult practice, and 51 pediatric). The median age was 50 years, and one-third planned to retire within the next 5-10 years. The majority (81%) were university-affiliated. Rheumatologists spent a median of 70% of their time in clinical practice, holding 6 half-day clinics weekly, with 10 new consultations and 45 followups seen per week. Work characteristics varied by type of rheumatologist (adult or pediatric) and by practice setting (community- or university-based). We estimated between 0 and 0.8 full-time rheumatologists per 75,000 population in each province. This represents a deficit of 1 to 77 full-time rheumatologists per province/territory to meet the CRA recommendation of 1 rheumatologist per 75,000 population, depending on the province/territory.

CONCLUSION

Our results highlight a current shortage of rheumatologists in Canada that may worsen in the next 10 years because one-third of the workforce plans to retire. Efforts to encourage trainees to enter rheumatology and strategies to support retention are critical to address the shortage.

Don't let up: implementing and sustaining change in a new post-licensure education model for developing extended role practitioners involved in arthritis care

Key message

Across a 9-year period, the Advanced Clinician Practitioner in Arthritis Care program has achieved a set of short-term “wins” giving direction and momentum to the development of new roles for health care practitioners providing arthritis care.

Implication

This is a viable model for post-licensure training offered to multiple allied health professionals to support the development of competent extended role practitioners (extended scope practice). Challenges at this critical juncture include: retain focus, drive, and commitment; develop academic and financial partnerships transferring short-term success to long-term sustainability; advanced, context-driven, system-level evaluation including fiscal outcome; health care policy adaptation to new human health resource development.

Supporting evidence

Success includes: completed 2-year health services research evaluating 37 graduates; leadership, innovation, educational excellence, and human health resource benefit awards; influential publications/presentations addressing post-licensure education/outcome, interprofessional collaboration, and improved patient care.

The patient perspective: arthritis care provided by Advanced Clinician Practitioner in Arthritis Care program-trained clinicians

Objective

To assess patient satisfaction with the arthritis care services provided by graduates of the Advanced Clinician Practitioner in Arthritis Care (ACPAC) program.

Materials and methods

This was a cross-sectional evaluation using a self-report questionnaire for data collection. Participants completed the Patient–Doctor Interaction Scale, modified to capture patient–practitioner interactions. Participants completed selected items from the Group Health Association of America’s Consumer Satisfaction Survey, and items capturing quality of care, appropriateness of wait times, and a comparison of extended-role practitioner (ERP) services with previously received arthritis care.

Results

A total of 325 patients seen by 27 ERPs from 15 institutions completed the questionnaire. Respondents were primarily adults (85%), female (72%), and living in urban areas (79%). The mean age of participants was 54 years (range 3–92 years), and 51% were not working. Patients with inflammatory (51%) and noninflammatory conditions (31%) were represented. Mean (standard deviation) Patient–Practitioner Interaction Scale subscale scores ranged from 4.50 (0.60) to 4.63 (0.48) (1 to 5 [greater satisfaction]). Overall satisfaction with the quality of care was high (4.39 [0.77]), as was satisfaction with wait times (referral to appointment, 4.27 [0.86]; in clinic, 4.24 [0.91]). Ninety-eight percent of respondents felt the arthritis care they received was comparable to or better than that previously received from other health care professionals.

Conclusion

Patients were very satisfied with and amenable to arthritis care provided by graduates of the ACPAC program. Our findings provide early support for the deployment and integration of ACPAC ERPs into the Ontario health care system and should inform future evaluation at the patient level.

System integration and clinical utilization of the Advanced Clinician Practitioner in Arthritis Care (ACPAC) Program-Trained Extended Role Practitioners in Ontario: a two-year, system-level evaluation

BACKGROUND

The Advanced Clinician Practitioner in Arthritis Care (ACPAC) program was developed in 2005 to prepare experienced physical and occupational therapists to function as extended role practitioners (ERPs) within models of arthritis care across Ontario, Canada.

PURPOSE

To examine the system-level integration and clinical utilization of the ACPAC program-trained ERP.

METHOD

A longitudinal survey was administered to all ACPAC graduates over a two-year period (n=30).

RESULTS

The majority of ERPs were physical therapists working in urban settings. Family physicians or physician specialists referred the majority of patients. The longest median wait time to access ERPs' services was 22 days. Half of the ERPs triaged patients, and most of those who did triage (75%) worked under medical directives. Approximately half (51.6%) of the patients seen had a diagnosis of osteoarthritis, followed by rheumatoid arthritis (14.7%).

CONCLUSION

Understanding the system-level impact of this unique human resource can help to shape healthcare planning and delivery of care.

Arthritis extended-role practitioners: impact on community practice (an exploratory study)

PURPOSE

We compared practice of extended role practitioners and experienced therapists without extended practice training to determine differences in assessment and management of clients with inflammatory arthritis, in preparation for a randomized controlled trial.

METHODS

Retrospective review of randomly selected charts of extended-role trained occupational therapists or physiotherapists and from experienced therapists matched on therapist discipline, geographical location, and time of referral. Three trained reviewers used standardized forms to extract data independently.

RESULTS

We reviewed 58 charts of adult clients with inflammatory arthritis. Compared with experienced therapists, extended-role practitioners were more likely to receive referrals specifically for assessments (52% vs. 14%); to treat clients with undifferentiated arthritis (48% vs. 10%); to document comorbidities (90% vs. 66%); to advocate on behalf of the client with the client's family, physician, or specialist (52% vs. 21%); to recommend or provide exercise or physical activity (86% vs. 62%); to educate clients about pain management (41% vs. 28%), energy conservation (24% vs. 14%), and posture (21% vs. 7%); to recommend splints (41% vs. 31%); and to refer for or recommend radiologic or laboratory assessments (14% vs. 3%). Experienced therapists were more likely to provide education about joint protection (41% vs. 31%), community resources (31% vs. 7%), and assistive devices (45% vs. 21%).

CONCLUSIONS

We identified possible differences in practice between extended-role practitioners and experienced therapists without training for extended practice. Capturing these details in future studies evaluating the efficacy of extended role practitioner interventions will be important.

Development and Early Evaluation of an Inter-professional Post-licensure Education Programme for Extended Practice Roles in Arthritis Care

PURPOSE

The Advanced Clinician Practitioner in Arthritis Care (ACPAC) Program was developed to train experienced physical and occupational therapists within extended practice roles with the aim of facilitating optimal, timely, and appropriate delivery of health care to patients with arthritis. This paper presents (1) the development of the ACPAC Program and (2) performance across the programme, as well as early quantitative and qualitative changes in clinical practice roles for the 2006 through 2008 cohorts of ACPAC Program graduates (n=19).

METHODS

Measurement of change in skills and knowledge involved standardized baseline and end-of-programme examinations as well as self-evaluation of a number of areas of clinical competence. Practice-focused surveys issued at baseline, mid-programme, and end of programme, as well as at 6 and 12 months after graduation, evaluated the practitioners' integration of advanced knowledge and skills acquired during the ACPAC Program into their extended practice roles.

RESULTS

Participants significantly increased their scores on examinations of clinical knowledge (p<0.001) and skills (p<0.001) from baseline through programme completion. There was an increase in frequency of performance of clinical tasks and assumption of responsibilities related to their extended practice roles from the beginning to the end of the programme. The five areas that changed in relation to these new roles were increased clinical responsibilities, efficiencies in practice settings, roles as educational leaders and mentors in the field of arthritis care, inter-professional collaboration, and improved access to care for patients with arthritis, particularly in remote areas.

CONCLUSION

Graduates of the ACPAC Program have demonstrated knowledge and skills for practising in extended roles that enhance the available human health resource pool for patients with arthritis.

Leading change in the transformation of arthritis care: development of an inter-professional academic-clinical education training model

The Advanced Clinician Practitioner in Arthritis Care (ACPAC) program is a novel, competency-based, rigorously evaluated advanced clinical and academic educational program created in 2005 and hosted by St. Michael's Hospital and The Hospital for Sick Children, Toronto, Ontario. The program is offered to experienced physical and occupational therapists selected to engage in expanded scope of practice roles with the aim to provide optimal, timely and appropriate delivery of healthcare to patients with arthritis in academic, non-academic and remote community healthcare settings. The ACPAC program is offered at a critical time in the context of rapidly changing healthcare delivery, producing highly skilled advanced practitioners across Ontario central to the development of innovative models of chronic disease management in arthritis care. The processes driving change and the risks assumed thereof, as well as a description of the successes, challenges and shortcomings of the ACPAC program, are intended to be instructive to other healthcare facilities considering similar initiatives.

13-Metre Walk Test Applied to the Elderly with Musculoskeletal Impairment: Validity Study

Purpose: The purpose of this study was to examine concurrent validity and known group validity for the 13-metre walk test.

Methods: Preoperative data were collected from a sample of elderly individuals awaiting total hip replacement. The measures used were the Timed Up & Go Test, 13-metre walk test, 6-minute walk test, Stair Performance Measure, and the three subscales from the Western Ontario and McMaster Universities Osteoarthritis Index (WOMAC).

Results: Scores on the 13-metre walk test were significantly correlated with each of the other functional outcome measures, although the magnitude of the correlations with the WOMAC subscales was modest. Subjects performed the 13-metre walk test at a greater velocity than the 6-minute walk test (p < .01). Individuals with gait aids performed more poorly than those without (p < .01).

Conclusions: The findings of this study support concurrent validity and known group validity for the 13-metre walk test. Information regarding additional psychometric characteristics, that is, the interrater and intrarater reliability and responsiveness of the 13-metre walk test, would be valuable to further support its use.

The human first carpometacarpal joint: osteoarthritic degeneration and 3-dimensional modeling

The purpose of this study was to gain insight into potential mechanical factors contributing to osteoarthritis of the human first carpometacarpal joint (CMC). This was accomplished by creating three-dimensional (3-D) computer models of the articular surfaces of CMC joints of older humans and by determining their locus of cartilage degeneration. The research questions of this study were: 1) What is the articular wear pattern of cartilage degeneration in CMC osteoarthritis?, (2) Are there significant topographic differences in joint area and contour between the joints of males and females?, and 3) Are there measurable bony joint recesses consistently found within the joint? The articular surfaces of 25 embalmed cadaveric joints (from 13 cadavers) were graded for degree of osteoarthritis, and the location of degeneration was mapped using a dissection microscope. The surfaces of 14 mildly degenerated joints were digitized and reconstructed as 3-D computer models using the Microscribe 3D-X Digitizer and the Rhinoceros 2.0 NURBS Modeling Software. This technology provided accurate and reproducible information on joint area and topography. The dorsoradial trapezial region was found to be significantly more degenerated than other quadrants in both males and females. Mean trapezial articular surface area was 197 mm 2 in males and 160 mm(2) in females; the respective mean areas for the metacarpal were 239 mm(2) in males and 184 mm(2) in females. Joints of females were found to be significantly more concave in radioulnar profile than those of males. Three bony joint recesses were consistently found, two in the radial and ulnar aspects of the trapezium and the third in the palmar surface of the metacarpal.

Structure and function of the lumbar intervertebral disk in health, aging, and pathologic conditions

This report is a comprehensive review of the basic and clinical science relating to the morphology and function of the intervertebral disc of the lumbar spine. The purpose is to review the anatomy, physiology, and biomechanics of the intervertebral disc of the lumbar spine in health, with aging, and in pathologic conditions. The complex morphology and ultrastructure of the intervertebral disc of the lumbar spine in the human provide the critical elements that permit normal mobility and transmission of force through the vertebral column. Alterations in this structure are manifest in a variety of clinical conditions routinely encountered in orthopaedic physical therapy practice. These structural and biomechanical changes are related to degenerative changes that occur in association with aging and trauma. Knowledge of the gross morphology and ultrastructure of the intervertebral disc and pathobiologic processes underlying associated conditions is essential to orthopaedic practice.

The Canadian Model of Occupational Performance applied to females with osteoporosis

Osteoporosis is a prevalent disease among older women. It results not only in physical limitations, but may raise spiritual and affective issues that can interfere with a person's ability to perform routine occupations. In addition, the social, cultural, physical, and institutional elements of the environment play a vital role in influencing the choices individuals make and how they manage symptomatic osteoporosis. The purpose of this paper is to examine the occupational impact of osteoporosis on post-menopausal women by applying the Canadian Model of Occupational performance (Canadian Association of Occupational Therapists, 1997) as an organizational framework to existing knowledge of this disease.

Supraphysiologic levels of testosterone affect cancellous and cortical bone in the young female cynomolgus monkey

The goal of this study was to evaluate the effects of chronically-elevated male levels of the potent androgen testosterone on the quality and quantity of both cancellous and cortical bone in a young (mean age 8.0 years), nonhuman female primate model (M. fascicularis). Thirteen intact female monkeys received continuous testosterone supplementation via subcutaneous implants over a 24-month period. A group of 16 untreated, intact, age-matched female monkeys served as controls. At sacrifice, the lumbar vertebrae and femora were recovered in order to analyze the bone mineral quality and quantity of cancellous and cortical bone, respectively, and compared to the control group. Mineralization profiles of the vertebrae and femora were obtained using the density fractionation technique. Chemical analysis of the three largest fractions retrieved by density fractionation was performed to evaluate differences in %Ca, %P, Ca/P ratio, and mineral content (%Ca + %PO4) between the control and experimental groups. In addition, unfractionated bone powder was examined by X-ray diffraction to identify any changes in crystal size. Coronal sections of vertebrae were analyzed for structural parameters using histomorphometry and image analysis. Cross sections taken at the midshaft diaphyseal femora were analyzed for structural macroscopic and intracortical parameters. A nonsignificant shift in the mineralization profile of the vertebrae was observed whereas there was a significant shift in the mineralization profile towards more dense bone in the treated femora as compared with controls (P < 0.05). There was no difference in terms of size/strain of the cortical or cancellous bone crystal as detected by X-ray diffraction. There was a trend towards an increase in cancellous bone area (B.Ar.) in the testosterone-treated vertebrae (P = 0.08) as compared with controls. The architecture of the cancellous bone remained nonsignificantly different between the treatment and control groups as evaluated by image analysis. There was a decrease in osteoid perimeter (P = 0.05) in the experimental group as compared with controls. There was a significant decrease in eroded perimeter measurements in the experimental group as compared with controls (P < 0.03). Although there was a trend towards an increase in cancellous bone area, mineralization was not significantly different in the vertebrae of testosterone-treated female monkeys, indicating that the newly-formed bone tissue became relatively normally mineralized over the two-year period. An increase in bone area, with indices of an overall decreased remodelling pattern as compared with controls, suggests that cancellous bone in the young, nonhuman female primate had been receptive to supraphysiologic levels of testosterone supplementation over the two-year period. There was a trend for an increase in cortical bone area and width with an increased periosteal perimeter in the testosterone-treated group as compare with controls. There was an increase in intracortical remodelling activity with a significant increase in percent porosity (P < 0.05), osteonal bone (P < 0.05), and mean wall width (P < 0.05) in the testosterone-treated group. In conclusion, the cancellous bone from female monkeys appeared to respond to the antiresorptive stimulus of male levels of testosterone with significantly diminished turnover parameters in this compartment. In contrast, the cortical bone compartment responded by displaying significant intracortical remodelling over a two-year period.

The long-term effect of ovariectomy on the quality and quantity of cancellous bone in young macaques

The effect of ovariectomy on the quality and quantity of cancellous bone using the young cynomolgus monkey was evaluated after a 2-year period. The bodies of the second lumbar vertebrae were analyzed for changes in bone mineral quality using density fractionation, chemical analysis, and X-ray diffraction techniques. Changes in bone tissue quality and quantity were evaluated using bone histomorphometry and image analysis. The experimental group (n = 14) was made surgically menopausal (bilaterally ovariectomized), compared with intact controls (n = 16), and then sacrificed after a 2-year period. There was a non-significant shift in the mineralization profile towards less dense bone in the ovariectomized (OVX) vertebrae compared with controls. Physical characteristics of the bone mineral in terms of crystal size or strain were unaffected by OVX. There was a parallel increase in mineral content with fractions of increasing density, however there was no difference in mineral content or the Ca/P ratio in each fraction between treatment groups. Histomorphometric analysis for structural parameters demonstrated no difference in bone volume between control and OVX groups. There was no significant change in trabecular width in the OVX vertebrae compared with controls. There was a significant increase in both osteoid volume and osteoid surface in the OVX vertebrae (P < 0.001). Trabecular architecture as measured by image analysis was unchanged. There was a significant increase in eroded surface in the OVX vertebrae (P < 0.03) compared with the controls.(ABSTRACT TRUNCATED AT 250 WORDS)