Novel Method for Diagnosing Lateral Patellar Compression Syndrome Using X-ray: a Retrospective Case-Control Study

Peking University

Status: Completed

Conditions: Lateral Patellar Compression Syndrome

Treatments: Other: no intervention

Study type: Observational

Funder types: Other

Identifiers

NCT04454593

M2019464

Details and patient eligibility

About

This study evaluates whether the patellar axial radiograph of lateral patellar curvature angle （LPCA）with knee flexion at 30 ° can be used as a new diagnostic surrogate of lateral patellar compression syndrome（LPCS）. We believe that the new index LPCA has high sensitivity and specificity in initial diagnosis of LPCS using axial patellar radiograph with knee flexion at 30 ° , and has high application value.

Full description

Background: A well-established reference is lacking for diagnosing lateral patellar compression syndrome (LPCS), and this diagnosis currently depends on clinicians' subjective judgment and several examination results. X-rays are primarily used to diagnose LPCS, but they have low detection rates of patellar tilt using the congruence angle (CA) and patellar tilting angle (PTA).

Purpose: To investigate whether patellar axial radiography of the lateral patellar curvature angle (LPCA) of knee in 30° flexion can diagnose LPCS.

Methods: We enrolled 87 patients between 2016 and 2019 and divided them as per diagnosis into three groups of 29 each: LPCS, patellar dislocation (PD, control), and meniscus tear (MT, negative control) groups. A senior radiologist and the chief physician of sports medicine examined their patellar axial radiographs of the knee in 30° flexion using a computer imaging system, measuring LPCA, PTA, and CA. Univariate analysis of variance and Kruskal-Wallis H test were used to compare measurement data with normal distribution and non-normal distribution, respectively. Bonferroni correction was used to analyze different indicators for different groups. The area under the curve (AUC) was calculated to verify the value of LPCA in initial diagnosis of LPCS.

Enrollment: 87 patients

Sex: All

Volunteers: No Healthy Volunteers

Inclusion criteria

• Patients were diagnosed as LPCS ，MT and PD respectively

Exclusion criteria

• patients with ligament injury, malunion of patella fracture, free bodies in the joint, surgical contraindications, and with both knees affected.

Trial design

87 participants in 3 patient groups

Lateral patellar compression syndrome

Description:

Patients diagnosed with lateral patellar compression syndrome between February 2016 and April 2019

Treatment:

Other: no intervention

patellar dislocation

Description:

Patients diagnosed with patellar dislocation between February 2016 and April 2019

Treatment:

Other: no intervention

meniscus tear

Description:

Patients diagnosed with meniscus tear between February 2016 and April 2019

Treatment:

Other: no intervention