argument could be made that hip strengthening may address the
underlying cause of abnormal patellofemoral joint loading,
whereas quadriceps strengthening may be addressing the symptom
of pain. Further research is necessary to test this hypothesis.
Study limitations
Our study sample consisted of a relatively small, homogeneous
group of patients with moderate to severe impairments. This may
limit the generalizability of our findings to other PFP populations.
Additionally, the exercises chosen may have influenced the results
obtained. For example, the use of noneweight-bearing terminal
knee extension (30e0) has been reported to increase patellofemoral
joint reaction force and stress.40 It is possible that superior
results may have been obtained if patients performed this exercise
at lesser knee flexion angles (ie, 90e45). However, all exercises
were performed using a resistance that did not elicit pain. Finally,
the partial squat exercise used in the quadriceps group was performed
in weight-bearing. As such, it is possible that hip strength
gains occurred in this group.
argument could be made that hip strengthening may address theunderlying cause of abnormal patellofemoral joint loading,whereas quadriceps strengthening may be addressing the symptomof pain. Further research is necessary to test this hypothesis.Study limitationsOur study sample consisted of a relatively small, homogeneousgroup of patients with moderate to severe impairments. This maylimit the generalizability of our findings to other PFP populations.Additionally, the exercises chosen may have influenced the resultsobtained. For example, the use of noneweight-bearing terminalknee extension (30e0) has been reported to increase patellofemoraljoint reaction force and stress.40 It is possible that superiorresults may have been obtained if patients performed this exerciseat lesser knee flexion angles (ie, 90e45). However, all exerciseswere performed using a resistance that did not elicit pain. Finally,the partial squat exercise used in the quadriceps group was performedin weight-bearing. As such, it is possible that hip strengthgains occurred in this group.
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