PURPOSE: The purpose of this study is to identify functions of ligamentum teres during multi-planar movement of the hip joint and to evaluate the correlation between arthroscopic findings and preoperative magnetic resonance imaging (MRI) of ligamentum teres rupture. MATERIALS AND METHODS: With four fresh-frozen cadavers that were dissected for removal of all soft tissue from around the hip, leaving only the ligamentum teres intact, tension of ligamentum teres at each position of the hip during multiplanar movement of the hip joint was identified. Among patients who underwent arthroscopic treatment for hip joint lesion from June 2006 to December 2012, arthroscopic findings of 26 patients who showed ligamentum teres rupture on arthroscopy were compared retrospectively with finding of preoperative MRI and visual analogue scale pain score and modified Harris hip score preoperatively and at final follow-up were evaluated. RESULTS: The ligamentum teres was maximal taut at flexion with external rotation. Ligamentum teres rupture was suspected according to preoperative MRI in 20 cases (76.9%). All cases underwent arthroscopic debridement and thermal shrinkage for the ruptured ligamentum teres. At final follow-up, visual analogue scale pain score and modified Harris hip score had improved from 6.1 (4-9) and 63.7 (36.3-86.9) to 2.0 (0-5) and 88.4 (72.6-100), respectively (all p<0.001). CONCLUSION: The ligamentum teres is maximal taut at flexion with external rotation and contributes to internal stability. Ruptured ligamentum teres should be treated by arthroscopic debridement and thermal shrinkage.
Arthroscopy ; Cadaver ; Debridement ; Follow-Up Studies ; Hip Joint ; Hip* ; Humans ; Magnetic Resonance Imaging ; Retrospective Studies ; Round Ligament of Uterus ; Rupture

PURPOSE: To analyze the arthroscopic findings and treatment results of patients with a limitation of hip motion caused by early degenerative osteoarthritis. MATERIALS AND METHODS: Retrospective analysis was performed on 13 patients who underwent arthroscopic treatment from May 2009 to March 2010, among patients with a limitation of hip motion and femoroacetabular impingement symptoms by early degenerative osteoarthritis. Head-neck offset, anteversion, and a change in the alpha angle was compared. At the final follow up, the VAS (Visual analogue scale), modified Harris hip score, and range of motion were compared. RESULTS: The arthroscopic findings showed diffused synovitis in all 13 cases. Among them, 9 cases were accompanied with a labral tear, and 2 cases showed a labral deformity. The VAS decreased from 7.5 preoperatively to 1.8 postoperatively and the modified Harris hip score improved from 49.3(35-60) before surgery to 90.1(85-95) after surgery. Each flexion and internal rotation improved significantly (P<0.05) from 95.2degrees (60-120degrees) to 127.7degrees (110-140degrees) and 4.6degrees (-5-25degrees) to 25.4degrees (15-30degrees), respectively. CONCLUSION: This study shows that the arthroscopic treatment of femoroacetabular impingement with a limitation of the range of motion by early degenerative arthritis can be expected with an improvement in flexion and internal rotation of the hip.
Arthroscopy ; Congenital Abnormalities ; Femoracetabular Impingement ; Follow-Up Studies ; Hip ; Humans ; Osteoarthritis ; Range of Motion, Articular ; Retrospective Studies ; Synovitis

PURPOSE: To analyze the characteristics and causes of periprosthetic huge mass which occur after treatment by total hip arthroplasty. MATERIALS AND METHODS: Of the patients who had undergone total hip arthroplasty from January 2000 to October 2007, we retrospectively evaluated the 10 patients who suffered huge soft tissue mass. Five of these patients had received metal-on-metal bearing (group 1) prostheses, and the other 5 had received metal-on-polyethylene bearings (group 2). We evaluated the size and location of the mass, the extent of osteolysis, and the hematologic and pathologic examination results. RESULTS: Roentgenographically, the location of the masses varied from the acetabular area to the distal femoral stem. The mean mass diameter of all 10 patients was 14.6 cm(7-21 cm)x6.2 cm(3-9 cm)x7.2 cm(4-12 cm). Osteolytic lesions were found in 3 group 1 patients and 3 patients in group 2. High counts of lymphocytes and eosinophils were present in group 1. High counts of macrophages were present in group 2. CONCLUSION: The occurrence of osteolysis and huge soft mass after total hip arthroplasty is thought to be related to foreign body reaction by polyethylene wear particles and metal hypersensitivity. Outside-in patterned cortical thinning was considered to be indicative of a long standing periprosthetic soft tissue mass effect.
Arthroplasty ; Arthroplasty, Replacement, Hip ; Eosinophils ; Foreign-Body Reaction ; Hip ; Humans ; Hypersensitivity ; Lymphocytes ; Macrophages ; Osteolysis ; Polyethylene ; Prostheses and Implants ; Retrospective Studies ; Ursidae