Working Diagnosis:
Distal pole patellar stress fracture at the BTB harvest site
Infrapatellar fat pad syndrome
Malignant melanoma of the right anterior thigh

Treatment:
Orthopedic management included activity modification with temporary de-escalation of ACL rehabilitation intensity. A bone stimulator (electrical stimulation type) was used to promote healing of the patellar stress fracture. Ultrasound-guided platelet-rich plasma injection was administered to address infrapatellar fat pad inflammation. This represents an off-label use of platelet-rich-plasma and was pursued given the athlete's desire to minimize downtime and the limited alternative pharmacologic options in the context of concurrent oncologic treatment.
Blood flow restriction therapy was intentionally withheld due to theoretical concerns of malignancy progression and thrombogenic risk in the setting of active melanoma as described above. Standard ACL rehabilitation was continued at modified intensity throughout this period.
Oncologic management consisted of Mohs micrographic surgery for wide local excision of the melanoma. The patient subsequently completed recommended multidisciplinary surveillance evaluations with Obstetrics/Gynecology, Ophthalmology, and Dentistry

Outcome:
Mohs surgery achieved complete excision of the melanoma with clear margins. Comprehensive multidisciplinary evaluation demonstrated no evidence of metastatic disease at any mucosal or ocular site. The patient was established in a lifelong dermatologic surveillance protocol with annual gynecologic, ophthalmologic, and dental examinations.
Knee symptoms improved rapidly following PRP injection and bone stimulation, with meaningful symptomatic reduction within approximately three weeks. ACL rehabilitation was progressively resumed at full intensity. The patient's return to full professional competition was ultimately achieved approximately 13 months following ACL reconstruction. Of note, the timeline was extended beyond expectation by a secondary Achilles tendon injury sustained during late-stage rehabilitation, which necessitated a period of additional recovery and further illustrates the complexity of managing high-level athletes through prolonged rehabilitation courses with overlapping medical challenges. Blood flow restriction therapy was not reintroduced during the rehabilitation period.

Author's Comments:
This case presents an uncommon but clinically instructive scenario: two independent diagnoses, a harvest-site patellar stress fracture and malignant melanoma. Each diagnosis materially influencing the management of the other in a high-level professional athlete. The case addresses a specific, unresolved clinical question (BFR therapy in active malignancy) for which no current evidence-based guidelines exist, thereby contributing an original educational framework to the sports medicine literature. The work is original and has not been submitted or presented elsewhere.

Editor's Comments:
This case offers a pearl that transcends the individual diagnoses: when two unrelated conditions coexist in a high-level athlete, the treatment of one can constrain the rehabilitation of the other, and clinicians must sometimes make evidence-informed decisions in a genuine evidence vacuum. The most instructive teaching point concerns blood flow restriction (BFR) therapy in the setting of active malignancy. BFR generates its hypertrophic and strength benefits at low mechanical loads through transient venous occlusion, producing a hypoxic, metabolite-rich intramuscular environment, a mechanism now well documented to upregulate hypoxia-inducible factor 1α (HIF-1α), vascular endothelial growth factor (VEGF), VEGFR-2, and related angiogenic signaling in exercising skeletal muscle. While this angiogenic response is precisely what makes BFR therapeutically attractive for healthy tissue, the same HIF/VEGF axis is a central driver of pathologic tumor angiogenesis, raising a biologically plausible though entirely theoretical and unproven concern for stimulating the microenvironment of an active cutaneous melanoma.

References:
Newman, A, Barcia Durán, J, Von Itter, R. et al. Ischemic Injury Drives Nascent Tumor Growth Via Accelerated Hematopoietic Aging. J Am Coll Cardiol CardioOnc. 2025 Aug, 7 (5) 559-577. https://doi.org/10.1016/j.jaccao.2025.06.005
Katz, N. B., Tsitsilianos, N., Nowak, A. S., Douglas, S. R., Tenforde, A. S., & Borg-Stein, J. (2024). Advanced Non-Operative Interventions for Anterior Knee Pain. Current reviews in musculoskeletal medicine, 17(12), 589�"615. https://doi.org/10.1007/s12178-024-09930-x

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