Taghipourdarzinaghibi M1, Hosseinzadeh S2, Barzideh A2, Rashidpour FR3
1Babol University of Medical Sciences, Mobility Impairment Research Center, Babol, Iran, 2Babol University of Medical Sciences, Babol, Iran, 3Msc of Exercise Physiology, Babol, Iran
Background: Patellofemoral pain syndrome (PFPS) has been reported as the most common source of anterior knee pain which could potentially change physical function of lower extremity. Common objective measures of knee function include VAS, manual muscle testing and isokinetic evaluation. However, these tests have been shown to be poor predictors of function. Functional performance testing is an attempt to evaluate the knee joint under conditions that mimic realistic functional demands. Since the ultimate goal of rehabilitation is to return the patient to the highest functional level in the most efficient manner; but there is lack of information about effects of PFPS on lower extremity functional performance.
Purpose: The purpose of present study was to compare lower extremity functional performance in patients with PFPS and healthy subjects by functional performance tests.
Methods: A convenient sample of 38 subjects (22 PFPS and 16 healthy subjects) aged between 20-30 years was recruited in this cross sectional study. Single leg stance (SLS), Shuttle run (SR), Single leg hop for distance (SLHFD), Timed hop (TH), Single leg triple hop (SLTH) and Vertical jump (VJ) were assessed as first outcome measures in both groups. KOOS questionnaire and VAS were utilized to assess quality of life (QOL) and pain intensity as second outcome measures in the PFPS group. Variables were statistically analyzed by independent t-test and P 0.05 was considered for significance.
Results: Comparison of demographic variables between two groups demonstrated that they were matched. The functional tests proved to have high ICC value (0.87-0.93) for intrarater reliability. The results demonstrated mean difference between PFPS and healthy groups were not significant for SLS (P=0.53), SR (P=0.60) and SLHFD (P=34), TH (P=0.15), SLTH (P=0.12) and VJ (P=0.47). The results of Pearson correlation showed no significant correlation between VAS and KOOS with functional performance tests (P≥0.05).
Conclusion(s): The results of present study implicated that PFPS cuold not affect functional performance of lower extremity and there was not significant correlation between first and second outcom measurs. The results can be attributed to series of reasons such as low sample size, no classification of PFPS patients based on etiology and no consideration of duration. In addition, the subjects in both groups were young, so the function of patellofemoral joint may be compensated by another factors including upper and lower joints and muscles in the lower extremity kinetic chain.
Implications: The clinicians must couciosly interpret the results of functional performance tests for PFPS patients; because this topic needs further study.
Keywords: Patellofemoral pain syndrome, Functional performance test, lower extremity
Funding acknowledgements: We thank Babol University of Medical Sciences for financial support.
Purpose: The purpose of present study was to compare lower extremity functional performance in patients with PFPS and healthy subjects by functional performance tests.
Methods: A convenient sample of 38 subjects (22 PFPS and 16 healthy subjects) aged between 20-30 years was recruited in this cross sectional study. Single leg stance (SLS), Shuttle run (SR), Single leg hop for distance (SLHFD), Timed hop (TH), Single leg triple hop (SLTH) and Vertical jump (VJ) were assessed as first outcome measures in both groups. KOOS questionnaire and VAS were utilized to assess quality of life (QOL) and pain intensity as second outcome measures in the PFPS group. Variables were statistically analyzed by independent t-test and P 0.05 was considered for significance.
Results: Comparison of demographic variables between two groups demonstrated that they were matched. The functional tests proved to have high ICC value (0.87-0.93) for intrarater reliability. The results demonstrated mean difference between PFPS and healthy groups were not significant for SLS (P=0.53), SR (P=0.60) and SLHFD (P=34), TH (P=0.15), SLTH (P=0.12) and VJ (P=0.47). The results of Pearson correlation showed no significant correlation between VAS and KOOS with functional performance tests (P≥0.05).
Conclusion(s): The results of present study implicated that PFPS cuold not affect functional performance of lower extremity and there was not significant correlation between first and second outcom measurs. The results can be attributed to series of reasons such as low sample size, no classification of PFPS patients based on etiology and no consideration of duration. In addition, the subjects in both groups were young, so the function of patellofemoral joint may be compensated by another factors including upper and lower joints and muscles in the lower extremity kinetic chain.
Implications: The clinicians must couciosly interpret the results of functional performance tests for PFPS patients; because this topic needs further study.
Keywords: Patellofemoral pain syndrome, Functional performance test, lower extremity
Funding acknowledgements: We thank Babol University of Medical Sciences for financial support.
Topic: Musculoskeletal: lower limb; Orthopaedics; Musculoskeletal
Ethics approval required: Yes
Institution: Babol University of Medical Sciences
Ethics committee: committee of ethics in research
Ethics number: 0
All authors, affiliations and abstracts have been published as submitted.
