Osteo-combinorm

Abstract

The Osteo-combinorm is a specialized tool used to assess adherence to enhanced physical activity standards tailored for bone health, particularly relevant for individuals at risk of or living with Osteoporosis. This measure represents a composite standard, combining the requirements of the established Dutch Norm for Healthy Physical Activity (NNGB) and the Fitnorm.

Crucially, the Osteo-combinorm introduces a critical modification to these existing norms: adherence requires that the individual’s activity regimen must include functional strength training, focusing specifically on exercises for the lower extremity, performed a minimum of two times per week. The instrument provides a detailed description of the NNGB requirements across three age categories—youth, adults, and 55+—and includes the necessary test forms and flowcharts for assessment.

Keywords

Osteo-combinorm, Osteoporosis, Dutch Norm for Healthy Physical Activity, NNGB, Fitnorm, Strength training, Physical activity, Functional training, Geriatrics, Lower extremity, Mobility, KNGF.

Authors

The Dutch version of the Osteo-combinorm is derived from the official KNGF Guideline for Osteoporosis (KNGF-richtlijn Osteoporose). The KNGF (Royal Dutch Society for Physical Therapy) serves as the primary authority responsible for its clinical application and standardization in the Netherlands.

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Purpose

The primary purpose of the Osteo-combinorm is to provide a standardized, clinically relevant measure for physical therapists and healthcare professionals to evaluate whether patients, especially those with musculoskeletal conditions or bone density concerns, are meeting the recommended thresholds for bone-strengthening activity. It moves beyond general fitness standards to incorporate specific, targeted activities known to mitigate the risks associated with bone loss.

This combined norm serves as a diagnostic and monitoring tool, helping practitioners to structure intervention programs. By integrating the NNGB and Fitnorm requirements with the specialized needs of bone health (i.e., functional strength training), the instrument ensures that activity recommendations are both comprehensive in promoting overall health and specific in addressing the biological demands of maintaining skeletal integrity.

Construct

The Osteo-combinorm measures the construct of Osteo-Protective Physical Activity Adherence. This construct is operationalized through the fulfillment of three primary components:

• NNGB Adherence: Meeting the minimum required minutes and intensity levels of Physical activity for general health, based on the individual’s age group.
• Fitnorm Adherence: Meeting the specific requirements for fitness maintenance, typically involving higher intensity or frequency than the basic NNGB.
• Osteo-Specific Modification: Satisfying the requirement for functional strength training, explicitly targeting the lower extremity, performed at least twice weekly to provide the necessary mechanical load for bone stimulation.

The instrument thus assesses a complex behavioral construct that combines volume, intensity, and type of exercise, ensuring a holistic evaluation of movement patterns relevant to the prevention and management of Osteoporosis.

Validity

While the Osteo-combinorm itself is an adaptation, its validity is strongly rooted in the established validity of its constituent parts: the NNGB and the Fitnorm, which have been widely adopted in Dutch public health research. The added requirement—functional strength training for the lower extremities—lends significant Face Validity and Clinical Validity, as this specific type of exercise is scientifically recognized as essential for increasing bone mineral density and reducing fracture risk in vulnerable populations.

The instrument demonstrates strong Content Validity because its development was guided by the clinical expertise and empirical evidence compiled within the official KNGF Guideline for Osteoporosis. Although specific psychometric studies detailing the predictive validity of the combined score (Osteo-combinorm score) may be limited, its clinical utility is established through its direct linkage to evidence-based therapeutic recommendations.

Reliability

As the Osteo-combinorm is utilized primarily as a self-report questionnaire and flowchart assessment derived from objective norms, its reliability depends heavily on the consistency of patient reporting and the standardized application of the NNGB and Fitnorm criteria. The inclusion of a structured flowchart (stroomschema NNGB) aims to enhance Inter-rater Reliability among clinicians by providing clear, unambiguous decision points for assessing adherence.

The reliability of the underlying components (NNGB and Fitnorm adherence measures) is generally considered high within public health contexts. However, the reliability of the specific reporting mechanism for “functional strength training of the lower extremity” requires clear definition and consistent patient education to ensure high Test-Retest Reliability regarding the qualitative assessment of exercise type.

Factor Analysis

The Osteo-combinorm is not typically subject to traditional factor analysis because it is a criterion-based standard—a combination of existing, established criteria—rather than a psychometrically derived scale designed to measure latent traits. It functions as a composite checklist against a clinical norm.

Therefore, the instrument does not measure multiple underlying factors but rather provides a binary outcome: adherence (meeting all criteria) or non-adherence. The components (NNGB, Fitnorm, and specific strength training) are considered logically distinct elements that must be simultaneously satisfied to achieve the osteo-protective threshold.

Instrument

Test Type: Questionnaire/Checklist based on established clinical norms (Criterion-referenced assessment)

Format: The instrument utilizes a test form (Testformulier NNGB) and a structured flowchart (Stroomschema NNGB) to guide the assessment of adherence across the required parameters.

Language Available: Dutch (Nederlands)

Population Group: Clinical and General Population

Age Group: Youth, Adults, and Elderly (55+)

Population Details: Specifically designed for broad application but is particularly relevant for populations requiring enhanced monitoring of bone health, such as patients with or at risk of Osteoporosis and other bone, joint, or cartilage disorders.

Test Methodology: Self-report or interview-based assessment evaluated against the specific frequency, duration, and type requirements of the combined NNGB and Fitnorm, including the mandatory functional strength training component. The assessment focuses on Activities and Mobility/Movement, particularly concerning the Lower extremity.

Keywords

KNGF-richtlijn, Mobiliteit, Bewegingsapparaat, Botdichtheid, Functionele krachttraining, Stroomschema, Testformulier, NNGB-norm, Gezond bewegen.

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Authors

Author ORCID Identifier: N/A (Derived from institutional guidelines)

Affiliation Email addresses: Contact the KNGF (Royal Dutch Society for Physical Therapy) for official inquiries regarding the guideline.

Correspondence Address: Refer to the official publication details of the KNGF Guideline for Osteoporosis.

Permissions & Fee and Test Year

Since the Osteo-combinorm is derived directly from the official national clinical guidelines published by the KNGF, it is generally intended for use by healthcare professionals within the Dutch healthcare system. Specific licensing fees for use outside of clinical practice may vary, but the underlying norms (NNGB and Fitnorm) are public health standards.

The specific year of introduction for the Osteo-combinorm adaptation is linked to the publication date of the KNGF Guideline on Osteoporosis, which mandated this enhanced physical activity standard.

The original PDF for the Explanatory Form (Toelichtingsformulier) can be downloaded here: Osteo-combinorm-form.pdf

The original PDF for the Measurement Instrument (Meetinstrument) can be downloaded here: osteo-combinorm-meetinstr.pdf

Reference’s

References are primarily drawn from the official clinical documentation that established the norm:

• KNGF (Koninklijk Nederlands Genootschap voor Fysiotherapie). (Year of Publication). KNGF-richtlijn Osteoporose [KNGF Guideline for Osteoporosis]. Amersfoort, Netherlands: KNGF.
• Netherlands Institute for Sport and Physical Activity (NISB). (Various Years). Documentation relating to the Nederlandse Norm Gezond Bewegen (NNGB) and the Fitnorm.
• Scientific literature supporting the inclusion of functional strength training for bone mineral density in the lower extremity.

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Items of the Osteo-combinorm

IMPORTANT: The following scale items must be preserved in their original language and must not be changed in any way. (Note: The source content provided the description of the components rather than individual questionnaire items. This descriptive text summarizes the criteria assessed by the instrument.)

De osteo-combinorm bevat een beschrijving van de Nederlandse norm gezond bewegen (NNGB) voor de 3 leeftijdscategorieën: jongeren, volwassenen en 55-plussers. En daarnaast bevat het document het testformulier NNGB en het stroomschema NNGB.

De osteo-combinorm is een combinatie van de fitnorm en de combinorm. Iemand voldoet aan de osteo-combinorm als wordt voldaan aan de NNGB én de fitnorm met de volgende aanpassingen: de activiteit dient ten minste twee keer per week te bestaan uit functionele krachttraining met in elk geval oefeningen voor de onderste extremiteit.