E-36 Free Communication/Poster - Sport Biomechanics: JUNE 4, 2010 7:30 AM - 12:30 PM: ROOM: Hall C
Females generally move in greater hip adduction (HADD) and internal rotation (HIR) compared to males. They also tend to move in genu valgus, where males move in genu varus. Female runners with patellofemoral pain syndrome (PFPS) exhibit even greater HADD and HIR, as well as contralateral pelvic drop (CPD), than healthy females. Males with PFPS may have differing mechanics than females with PFPS.
PURPOSE: To compare the lower extremity mechanics of PFPS males to PFPS females. PFPS males were expected to demonstrate reduced peak HADD, contralateral pelvic drop (CPD), and HIR than PFPS females and healthy male controls.
METHODS: This is an ongoing study with 4 PFPS males (21.0yrs±1.1, 13.0 mi/wk±4.1), 4 male controls (CON) (23.3yrs±0.8, 14.8 mi/wk±2.5), and 3 PFPS females (20yrs±0.6, 14.3mi/wk±5.4) collected to date. Subjects traversed a 25 m runway at 3.35 m/s as 5 trials of kinematic data were collected at 200 Hz. HADD, HIR and CPD were calculated and averaged for each group.
RESULTS: As expected, PFPS females demonstrated the greatest amount of HADD and HIR. PFPS males ran with hip external rotation (HER) while the male CON were in HIR. Surprisingly, PFPS males exhibited the greatest CPD of the three groups.
CONCLUSIONS: There was a clear delineation between genders for HIR. PFPS males actually ran with HER, while females ran with HIR. Femoral internal rotation has been shown to increase loading to the lateral patella, while external rotation has been shown to increase loading to the medial patella. It is interesting to note that all the PFPS males described medial patellar pain, while all the PFPS females described lateral pain. These preliminary data suggest a gender specific mechanism for PFPS.
Support: Physical Therapy Foundation, NIH 1 S10 RR022396