this study show the EFFECT OF CRYOTHERAPY ON KINEMATIC GAIT PARAMETERS IN PATIENTS WITH CHRONIC PATELLOFEMORAL PAIN SYNDROME and review its reliability.

Participants were randomly allocated into two equal groups (A and B ) were done by a blinded independent researcher who opened enclosed envelopes containing computer generated randomization serially number index cards using statistical package for social science (SPSS),program (version 20 for windows ,spss, Chicago Illinois,USA) There were no dropouts among the participants throught the study after randomization.

Sixty patients from both genders were participated in this study. they were selected from the outpatient clinic of Faculty of Physical Therapy ,Cairo University with a PFPS.

The Patients of both genders with their ages were ranging from 18 to 40 years old and their BMI was from 20 to 25 kg/m2.

Thirty patients with PFPS, Their ages ranging from 18 to 40 years old ,Their BMI was from 20 to 25 kg/m2 received treatment in form of Traditional treatment (Strengthening exercise, Stretching, ultrasound and electrotherapy). The treatment performed three time a week for 4 weeks.

Thirty patients with PFPS, Their ages ranging from 18 to 40 years old ,Their BMI was from 20 to 25 kg/m2 received treatment in form of Traditional treatment (Strengthening exercise, Stretching, ultrasound and electrotherapy) with cryotherapy, The treatment performed three time a week for 4 weeks.

Inclusion Criteria:

• The patients were diagnosed as patellofemoral pain by an orthopedist.
• The participants were eligible to be included if they had bilateral PFPS or unilateral PFPS.
• Duration of knee pain is 4-5 weeks during 6 months prior to study. (Collins et al., 2010).
• Their ages were ranging from 18 to 40 years (Clin Rheumatol et al., 2012).
• Their BMI was ranging from(20 to 25 kg/m2) (Fischer et al., 2009)

Exclusion Criteria:

• • Rheumatoid Arthritis or other systemic rheumatic diseases.

  • Dementia, psychosis.
  • Active substance abuse disorder; acute or chronic disease, injury, deformity.
  • Operation of the lower limb and knee.
  • Severe hearing or visual impairment.
  • Hospitalization for a cardiovascular condition, cerebral infarction or arrhythmia in the previous 3 months.
  • Recent history of 3 or more falls.
  • Current participation in another OA intervention study.
  • Uncontrolled diabetes mellitus.
  • Intra-articular knee injections in the previous 6 months.
  • Contraindications to cryotherapy application those that feel a high level of discomfort or pain during the application.