Hip Pelvis.  2012 Sep;24(3):231-236. 10.5371/hp.2012.24.3.231.

Paralabral Cysts and Their Correlation with Acetabular Disorder

• Kang C
• Hwang DS
• Jeon YS
• Kang DH
• Song JW

• KMID: 2054137
• DOI: http://doi.org/10.5371/hp.2012.24.3.231

Abstract

PURPOSE
To evaluate the correlation between MRI findings and hip joint lesions evaluated by arthroscopy in patients affected by paralabral cyst.
MATERIALS AND METHODS
Of patients treated by hip arthroscopy from Jan 1996 to Mar 2010, 17 cases symptomatic of paralabral cyst as observed by preoperative MRI were analyzed. The presence of an acetabular labrum tear, and the location and size of the cyst were evaluated using both preoperative MRI and intraoperative arthroscopy. Visual analogue scale (VAS), modified Harris hip scale, and Hip outcome score results were compared as determined by the two assessment methods.
RESULTS
According to the MRI findings, the locations of the cysts included 5 cases in the anterosuperior, 2 anterior, 4 anteroinferior, 2 posterosuperior and 4 posteroinferior. The mean size of all cysts was 25.1x12.5x13.8 mm3. Postoperatively, the mean VAS score for all patients improved from 7.7 to 1.5, their modified Harris hip score improved from 58.8 to 90.7, and their Hip outcome score improved from 54 to 93.5.
CONCLUSION
Painful paralabral cyst was mainly associated with an acetabular labral tear and we concluded that observation of paralabral cyst upon preoperative MRI provided indirect evidence of proximal acetabular labral pathology.

Keyword

Hip; Paralabral cyst; Acetabular labral tear

MeSH Terms

Arthroscopy
Hip
Hip Joint
Humans

Figure

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  Fig. 1 (A) Preoperative plain radiographs & MRI shows coxa profunda, mild ischial spine sign, and cyst at 3-5 o'clock (arrow). (B) Arthroscopic finding shows labral tear associated paralabral cyst. (C) Postoperative F/U MRI at 2 months shows disappearance of cyst.

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  Fig. 2 45 years-old female with Rt buttock pain and radiating to leg. (A) Plain radiograph shows the prominent acetabular rim. (B) In MRI, cyst exist from posterior to posteroinferior of the hip joint and multinodular cysts situated along the sciatic nerve (arrows). (C) Arthroscopic finding shows cyst (C) around sciatic nerve and opening to joint (arrow). (D) Extraarticular cyst have been nearly disappeared at POD 22months on MRI. But, cysts around acetabulum was still existed.

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