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Eccentric hip muscle function in females with and without patellofemoral pain syndrome.
J Athl Train. 2009 Sep-Oct; 44(5):490-6.JA

Abstract

CONTEXT

Patellofemoral pain syndrome (PFPS) is a common knee condition in athletes. Recently, researchers have indicated that factors proximal to the knee, including hip muscle weakness and motor control impairment, contribute to the development of PFPS. However, no investigators have evaluated eccentric hip muscle function in people with PFPS.

OBJECTIVE

To compare the eccentric hip muscle function between females with PFPS and a female control group.

DESIGN

Cross-sectional study.

SETTING

Musculoskeletal laboratory.

PATIENTS OR OTHER PARTICIPANTS

two groups of females were studied: a group with PFPS (n = 10) and a group with no history of lower extremity injury or surgery (n = 10).

INTERVENTION(S)

Eccentric torque of the hip musculature was evaluated on an isokinetic dynamometer.

MAIN OUTCOME MEASURE(S)

Eccentric hip abduction, adduction, and external and internal rotation peak torque were measured and expressed as a percentage of body mass (Nm/kg x 100). We also evaluated eccentric hip adduction to abduction and internal to external rotation torque ratios. The peak torque value of 5 maximal eccentric contractions was used for calculation. Two-tailed, independent-samples t tests were used to compare torque results between groups.

RESULTS

Participants with PFPS exhibited much lower eccentric hip abduction (t(18) = -2.917, P = .008) and adduction (t(18) = -2.764, P = .009) peak torque values than did their healthy counterparts. No differences in eccentric hip external (t(18) = 0.45, P = .96) or internal (t(18) = -0.742, P = .47) rotation peak torque values were detected between the groups. The eccentric hip adduction to abduction torque ratio was much higher in the PFPS group than in the control group (t(18) = 2.113, P = .04), but we found no difference in the eccentric hip internal to external rotation torque ratios between the 2 groups (t(18) = -0.932, P = .36).

CONCLUSIONS

Participants with PFPS demonstrated lower eccentric hip abduction and adduction peak torque and higher eccentric adduction to abduction torque ratios when compared with control participants. Thus, clinicians should consider eccentric hip abduction strengthening exercises when developing rehabilitation programs for females with PFPS.

Authors+Show Affiliations

São Carlos Federal University, São Paulo, Brazil.No affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

19771287

Citation

Baldon, Rodrigo de Marche, et al. "Eccentric Hip Muscle Function in Females With and Without Patellofemoral Pain Syndrome." Journal of Athletic Training, vol. 44, no. 5, 2009, pp. 490-6.
Baldon Rde M, Nakagawa TH, Muniz TB, et al. Eccentric hip muscle function in females with and without patellofemoral pain syndrome. J Athl Train. 2009;44(5):490-6.
Baldon, R. d. e. . M., Nakagawa, T. H., Muniz, T. B., Amorim, C. F., Maciel, C. D., & Serrão, F. V. (2009). Eccentric hip muscle function in females with and without patellofemoral pain syndrome. Journal of Athletic Training, 44(5), 490-6. https://doi.org/10.4085/1062-6050-44.5.490
Baldon Rde M, et al. Eccentric Hip Muscle Function in Females With and Without Patellofemoral Pain Syndrome. J Athl Train. 2009 Sep-Oct;44(5):490-6. PubMed PMID: 19771287.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Eccentric hip muscle function in females with and without patellofemoral pain syndrome. AU - Baldon,Rodrigo de Marche, AU - Nakagawa,Theresa Helissa, AU - Muniz,Thiago Batista, AU - Amorim,César Ferreira, AU - Maciel,Carlos Dias, AU - Serrão,Fábio Viadanna, PY - 2009/9/23/entrez PY - 2009/9/23/pubmed PY - 2010/1/8/medline KW - hip abduction KW - hip external rotation KW - torque SP - 490 EP - 6 JF - Journal of athletic training JO - J Athl Train VL - 44 IS - 5 N2 - CONTEXT: Patellofemoral pain syndrome (PFPS) is a common knee condition in athletes. Recently, researchers have indicated that factors proximal to the knee, including hip muscle weakness and motor control impairment, contribute to the development of PFPS. However, no investigators have evaluated eccentric hip muscle function in people with PFPS. OBJECTIVE: To compare the eccentric hip muscle function between females with PFPS and a female control group. DESIGN: Cross-sectional study. SETTING: Musculoskeletal laboratory. PATIENTS OR OTHER PARTICIPANTS: two groups of females were studied: a group with PFPS (n = 10) and a group with no history of lower extremity injury or surgery (n = 10). INTERVENTION(S): Eccentric torque of the hip musculature was evaluated on an isokinetic dynamometer. MAIN OUTCOME MEASURE(S): Eccentric hip abduction, adduction, and external and internal rotation peak torque were measured and expressed as a percentage of body mass (Nm/kg x 100). We also evaluated eccentric hip adduction to abduction and internal to external rotation torque ratios. The peak torque value of 5 maximal eccentric contractions was used for calculation. Two-tailed, independent-samples t tests were used to compare torque results between groups. RESULTS: Participants with PFPS exhibited much lower eccentric hip abduction (t(18) = -2.917, P = .008) and adduction (t(18) = -2.764, P = .009) peak torque values than did their healthy counterparts. No differences in eccentric hip external (t(18) = 0.45, P = .96) or internal (t(18) = -0.742, P = .47) rotation peak torque values were detected between the groups. The eccentric hip adduction to abduction torque ratio was much higher in the PFPS group than in the control group (t(18) = 2.113, P = .04), but we found no difference in the eccentric hip internal to external rotation torque ratios between the 2 groups (t(18) = -0.932, P = .36). CONCLUSIONS: Participants with PFPS demonstrated lower eccentric hip abduction and adduction peak torque and higher eccentric adduction to abduction torque ratios when compared with control participants. Thus, clinicians should consider eccentric hip abduction strengthening exercises when developing rehabilitation programs for females with PFPS. SN - 1938-162X UR - https://www.unboundmedicine.com/medline/citation/19771287/Eccentric_hip_muscle_function_in_females_with_and_without_patellofemoral_pain_syndrome_ L2 - https://www.ncbi.nlm.nih.gov/pmc/articles/pmid/19771287/ DB - PRIME DP - Unbound Medicine ER -