Patellofemoral pain syndrome (PFPS) is a common source of knee pain in the physically active population, predominantly in women. The incidence rate of PFPS among athletes is 25 percent, which is higher than that of general population. PFPS is caused by repetitive stress and aggravated in athletes by cycling and running. These symptoms are caused by structural or biomechanical changes of the joint, which becomes exacerbated by activities such as going up and down stairs, sit for a prolonged period, squatting or kneeling, resulting in increased compressive forces in the joint patellofemoral. It is characterized by defused pain in front of knee. Other signs also present are the patellar crepitus, swelling, and joint blockage despite being deemed a multifactorial condition with no single cure, PFPS is commonly attributed to muscular dysfunction, for which conservative rehabilitation is the treatment of choice. Historically, PFPS has been linked to impairments of the quadriceps muscle.

This study will be a randomized clinical trial will be conducted in Pakistan sports board Lahore, Model town Sports Club Lahore and Sheikh Zaid Hospital, Lahore. Sample size will be taken to evaluate the effects of open chain exercise and closed chain exercise among athletes with an age group of 18 - 40 years. Non probability convenient sampling technique would be used. Players having an experience of at least 8 months would be a part of study experiencing recurrent knee pain. Participants will be randomly assigned to 2 groups. Group A will include participants who will receive open kinetic chain exercises 3sets of 10 repetitions for each exercise along with the general training. Group B will include the participants who will receive closed kinetic chain exercises 3sets of 10 repetitions for each exercise along with general training.3sessions per week will be given for 6weeks.The subjects will be assessed for pain, function and balance at baseline and after 6weeks of treatment. After collecting data from defined settingit will be entered and analyzed using statistical package for social sciences (SPSS) for Windows software, version 25.

Inclusion Criteria:

• Adult athletes with age 18 to 30 years
• Anterior Knee pain
• An insidious onset of symptoms not related to trauma.
• Pain with compression of patella.
• Pain on palpation of patellar facets.
• Experienced players (who are in practice from last 8 months or a year).

Exclusion Criteria:

• Symptoms present less than 1 month.
• Intra-articular knee pathologies like O.A, R.A etc
• History of knee surgery within last year.
• History of traumatic injuries like patellar dislocations or subluxation
• Any other lower extremity injuries.