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Reliability of 3 Different Arthroscopic Classifications for Chondral Damage of the Acetabulum
Tomas Amenabar1, Julio Piriz2, Claudio Mella2
1Instituto Traumatologico Santiago, Santiago, Chile.
Insights
The Haddad classification showed the best interobserver reliability for assessing chondral damage during hip arthroscopy. Intraobserver reliability was similar across the Outerbridge, Beck, and Haddad systems.
Area of Science:
- Orthopaedic Surgery
- Sports Medicine
- Biomedical Engineering
Background:
- Articular cartilage damage is a common finding during hip arthroscopy for femoroacetabular impingement (FAI).
- Accurate classification of chondral damage is crucial for treatment planning and prognosis.
- Existing classification systems may have variable reliability among surgeons.
Purpose of the Study:
- To evaluate and compare the interobserver and intraobserver reliability of three distinct chondral damage classification systems.
- Specifically assess the Outerbridge, Beck, and Haddad classifications in the context of hip arthroscopy.
Main Methods:
- Prospective multicenter study involving hip arthroscopy for FAI with documented chondral damage.
- Standardized intra-articular video recordings analyzed by four fellowship-trained hip arthroscopy surgeons.
- Surgeons independently classified lesions twice, four months apart, using Outerbridge, Beck, and Haddad systems.
- Interobserver and intraobserver reliability assessed using percentage agreement and weighted Cohen kappa (κ) values.
Main Results:
- The Haddad classification demonstrated the highest interobserver reliability (average κ = 0.47).
- Interobserver agreement was lowest for the Outerbridge classification (average κ = 0.28) and intermediate for the Beck classification (average κ = 0.33).
- Intraobserver reliability was comparable across all three systems, with mean Cohen κ values ranging from 0.62 to 0.68.
Conclusions:
- The Haddad classification system appears to be the most reliable for assessing chondral damage between different surgeons during hip arthroscopy.
- No significant differences were observed in the consistency of classification by individual surgeons (intraobserver reliability) among the studied systems.
Purpose:
To report the interobserver and intraobserver reliability of 3 chondral damage classifications used to assess articular cartilage damage during hip arthroscopy.
Methods:
A prospective multicenter study was performed during April and May 2013. Inclusion criteria were all patients who underwent hip arthroscopy for femoroacetabular impingement (FAI) and had evidence of chondral damage at the time of surgery. Intra-articular recordings were obtained during the operation in a standardized way. These recordings were obtained from 2 different hospitals in 2 countries by 3 different surgeons. Four fellowship-trained orthopaedic surgeons, with at least 2 years postfellowship experience in hip arthroscopy, independently analyzed the recordings 2 times in randomized order and 4 months apart. They classified the lesions according to the Outerbridge, Beck, and Haddad classifications of chondral damage. The values obtained were used for interobserver and intraobserver analysis. Percentage of agreement and weighted Cohen κ values were calculated.
Results:
Absolute agreement between observers was present in 12.5% of the cases for the Outerbridge classification, in 20% of the cases for the Beck classification, and in 40% of the cases for the Haddad classification. For interobserver reliability, the average weighted Cohen κ values were 0.28 (95% confidence interval [CI], 0.16 to 0.39), 0.33 (95% CI, 0.24 to 0.41), and 0.47 (95% CI, 0.42 to 0.51) for the Outerbridge, Beck, and Haddad classification systems, respectively. For intraobserver reliability, the mean Cohen κ values were 0.62, 0.63, and 0.68 for the Outerbridge, Beck, and Haddad classification systems, respectively.
Conclusions:
In our series, the Haddad classification had the best interobserver reliability. There was no difference in the intraobserver reliability among the 3 classifications studied.
Level Of Evidence:
Level III, diagnostic study of nonconsecutive patients (without consistently applied reference gold standard).
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