A clinical test examination procedure to identify knee compartment overloading: A reliability and validity study...

Area of Science:

• Orthopedics
• Biomechanics
• Radiology

Background:

• Mechanical forces and joint misalignment are key risk factors for knee osteoarthritis (KOA).
• Early detection of KOA and differentiating compartment overloading (CO) are crucial for preventative interventions.
• This study assessed a battery of clinical tests for predicting knee CO.

Purpose of the Study:

• To evaluate the reliability and validity of ten clinical tests designed to predict knee compartment overloading (CO).
• To determine the criterion validity of a clinical examination against SPECT-CT for assessing CO.

Main Methods:

• Thirty participants with KOA symptoms underwent examination by independent observers using ten clinical tests.
• Inter-rater reliability was assessed for individual tests and the overall test battery's CO prediction.
• SPECT-CT served as the reference standard to assess criterion validity against clinical examination findings.

Main Results:

• Individual clinical test reliability (Kappa coefficients) ranged from 0.19 to 0.80.
• The overall test battery's reliability for predicting CO was moderate (k=0.52), but criterion validity against SPECT-CT was low (k=0.26).
• Valgus alignment was strongly associated with lateral CO, but other tests showed no significant relationships.

Conclusions:

• Accurate measurement of frontal plane knee alignment is vital for CO assessment.
• While some tests demonstrated good reliability, the overall clinical test battery showed low validity for predicting CO in its current form.
• The evaluated test battery is not yet suitable for routine clinical practice to determine knee compartment overloading.