INTRODUCTION: The T  nnis classification is widely accepted for grading @entity625 , but its usefulness as a reference in hip-preserving surgery is yet to be demonstrated. We aimed to evaluate reproducibility of the T  nnis classification in early stages of @entity570 , and thus determine whether it is a reliable reference for hip-preserving surgery. MATERIALS AND METHODS: Three orthopaedic surgeons with different levels of experience examined 117 hip X-rays that were randomly mixed of two groups: a group of 31 candidates for hip-preserving surgery and a control group of 30 @entity1 that were asymptomatic with respect to the hip joint. The surgeons were asked to rate an eventual @entity571 according to the T  nnis classification. After 2  months, the surgeons were asked to re-evaluate the X-rays in a random order. Intra- and interobserver reliabilities were calculated by comparing the observers' two estimations using Kappa statistics. RESULTS: Kappa values for interobserver reliability were slight or fair (range 0.173-0.397). Kappa values for intraobserver reproducibility were fair (range 0.364-0.397). Variance in grading no and slight @entity571 was the most frequent cause for intra- and interobserver disagreements (76.3 and 73.01  % of the non-concordant observations, respectively). The confidence interval analysis showed that the observers' experience did not affect reproducibility. CONCLUSIONS: The T  nnis classification is a poor method to assess early stages of @entity570 . These findings suggest that its routine use in therapeutic decision-making for conservative hip surgery should be reconsidered.

Reliability of T  nnis classification in early XXXX : a useless reference for hip-preserving surgery.

@entity1 :: ('9606', 'Species') :: ['patients'] @entity625 :: ('MESH:D001168', 'Disease') :: ['hip arthritis'] @entity571 :: ('MESH:D010003', 'Disease') :: ['osteoarthritis'] @entity570 :: ('MESH:D015207', 'Disease') :: ['hip osteoarthritis']
@entity625 :: (MESH:D001168,Disease) :: ['hip arthritis']
