Efficacy of Risedronate in Patients With Painful Periprosthetic Resorption of the Hip Prothesis (PTH)

Inclusion Criteria:

• Male or female subjects, 18 years of age or older.
• Written informed consent
• Subjects with cemented or not cemented total hip prothesis (for primitive or secondary coxarthrosis)
• Painful aseptic loosening
• Subject has pain 4 or greater on a 10 point Visual Pain Rating scale
• For subject woman of reproductive age, they must use reliable method(s) of contraception and/or abstinence, for the duration of therapeutic product exposure.

Exclusion Criteria:

• Subjects with septic loosening of hip prosthesis

  . Subjects with bilateral disease

• Subjects with implant mobility associated with pre-operative and intraoperative loosening
• Subjects under anti-osteoporotic treatment
• Subjects having stopped a biphosphonate traetment for less than one year

• Subjects with known allergy or sensitivity to any of the components in the study medication.

  • Subjects with Hypocalcemia
  • Females who are pregnant, breast-feeding, or planning a pregnancy during the study or who think that they may be pregnant at the start of the study, or females of childbearing potential who are unable or unwilling to use a reliable form of contraception during the study.
  • Subjects with severe kidney failure ( creatinine < 30 ml/min)).
  • Subjects participation in another research study
  • Subjects with previous osteonecrosis of the jaw