title: Arthroscopic release of iliopsoas tendon in patients with femoro-acetabular impingement: clinical results at mid-term follow-up.
abstract: BACKGROUND
  The iliopsoas tendon is a recognized cause of extra-articular hip pain, and tenotomy has been described as an effective treatment in patients who do not respond to conservative treatments. Endoscopic release showed higher success rate, lower recurrence, fewer complications compared to open surgery. The aim of the study is to report the results at a mean of 4 years follow-up of a series of patients affected by femoroacetabular impingement (FAI) and an associated iliopsoas tendinopathy, treated with hip arthroscopy and transcapsular tendon release.
  
  
  METHODS
  Fifteen patients were retrospectively reviewed. Assessment of radiographic signs of FAI was performed, the alpha angle, the femoral head-neck offset and the lateral center edge angle (LCEA) were collected. Osteoarthritis was assessed from the AP pelvic and graded according to the Tönnis classification. Modified Harris Hip Score (mHHS), VAIL score and VAS score were administered to all patients before surgery, at follow-up at 1 year (T1) and final follow-up (T2).
  
  
  RESULTS
  We found a statistical significant improvement in functional scores (mHHS and VAIL score) from the baseline to T2. According to VAS score, a statistical significant improvement was also found from T0 to T2, from a median of 5.5 (range 3-7) to 0 (range 0-5) (P<0.001). Two patients referred a recurrence of pain one year after surgery who were treated conservatively. No other complications have been reported.
  
  
  CONCLUSIONS
  Iliopsoas tendinopathy can be associated to FAI in some patients, and failure in diagnosing and treating may be the reason of poor results and a revision surgery. Arthroscopic iliopsoas tendon release seems to produce good clinical outcome, reducing pain and the rate of a revision surgeries. Level of evidence: IV case series.
authors.affiliation: Department of Adult Reconstruction Surgery, Hip/Knee and Hip Arthroscopy, Clínica Las Condes, Las Condes, Santiago de Chile, Chile.
authors.forename: Rodrigo
authors.initials: R
authors.lastname: Mardones
authors.affiliation: Department of Adult Reconstruction Surgery, Hip/Knee and Hip Arthroscopy, Clínica Las Condes, Las Condes, Santiago de Chile, Chile.
authors.forename: Alessio Giai
authors.initials: AG
authors.lastname: Via
authors.affiliation: Department of Adult Reconstruction Surgery, Hip/Knee and Hip Arthroscopy, Clínica Las Condes, Las Condes, Santiago de Chile, Chile.
authors.forename: Alexander
authors.initials: A
authors.lastname: Tomic
authors.affiliation: Department of Adult Reconstruction Surgery, Hip/Knee and Hip Arthroscopy, Clínica Las Condes, Las Condes, Santiago de Chile, Chile.
authors.forename: Claudio
authors.initials: C
authors.lastname: Rodriguez
authors.affiliation: Department of Adult Reconstruction Surgery, Hip/Knee and Hip Arthroscopy, Clínica Las Condes, Las Condes, Santiago de Chile, Chile.
authors.forename: Matias
authors.initials: M
authors.lastname: Salineros
authors.affiliation: Department of Adult Reconstruction Surgery, Hip/Knee and Hip Arthroscopy, Clínica Las Condes, Las Condes, Santiago de Chile, Chile.
authors.forename: Marcelo
authors.initials: M
authors.lastname: Somarriva
keywords: arthroscopic tendon release; femoroacetabular impingement; hip arthroscopy; iliopsoas tendon; tendinopathy