Mechanical loading of the patellar tendon (PT) is considered a primary factor associated with tendinopathy in jumping athletes. Prior research has not established if overloading or underloading movement profiles are present in symptomatic and asymptomatic athletes with PT structural abnormality (PTA) compared to healthy athletes. PURPOSE: To compare involved limb landing biomechanics between male athletes with and without patellar tendinopathy. METHODS: 43 males were grouped based on PT pain and ultrasound imaging of the proximal PT: symptomatic with PTA (SYM-PTA; n=13; 20±2yrs; 1.8±0.1m; 84±5kg), asymptomatic with PTA (ASYM-PTA; n=15; 21±2yrs; 1.8±0.1m; 82±13kg), and healthy control (CON; n=15; 20±2yrs; 1.8±0.1m; 79±12kg). 3D biomechanics were collected during double-limb jump-landing trials from a 30cm box placed 50% of participant height from 2 force plates. Kinematic (knee flexion angle (KF)) and kinetic (vertical ground reaction force (VGRF); internal knee extension moment (KEM); patellar tendon force (FPT)) variables were analyzed as continuous waveforms during stance phase. Mean values were calculated for each 1% of stance, normalized over 202 data points across stance phase (0-100%), and plotted with 95% confidence intervals for each group. Statistical significance was defined as a lack of 95% CI overlap for ≥ 3 consecutive %; average mean differences (MD) were calculated. RESULTS: SYM-PTA had lesser KF than CON over stance phase (8-76%, MD: 15.8±2.7°). ASYM-PTA had lesser KF than CON in the early (8-13%, MD: 8.0±0.4°; 21-24%, MD: 11.11±0.32°) and late (74-94%, MD: 9.6 ± 1.1°) stance phase. SYM-PTA group had lesser KEM than CON in early stance (6.5-9%, MD: 0.04 ± 0.004 Nm[kgm]-1), as well as ASYM-PTA in mid-stance (38-56%, MD: 0.03 ± 0.001 Nm[kgm]-1). SYM had lesser FPT in early stance (6-9%, MD: 0.9 ± 0.2BW) than CON and in mid-stance (36-60%, MD: 0.7 ± 0.1BW) than ASYM-PTA. There were no differences in VGRF between groups. CONCLUSIONS: Male athletes with SYM-PTA demonstrated a PT load-avoidance profile during a double-limb landing task compared to ASYM-PTA and CON athletes. ASYM-PTA did not show evidence of overloading compared to CON. Our findings support the use of individualized treatments for athletes along the continuum of patellar tendinopathy to maximize load-bearing capabilities of tendon.