Topography of synovial bursae
In the anterior knee region, several levels of synovial bursae are distinguished to protect tissues from friction. They are conventionally divided into three main zones:
- Above the patella. Here lies the suprapatellar bursa (bursa suprapatellaris). Its crucial anatomical feature is that in the vast majority of people (about 85%), it is not isolated but communicates broadly with the upper anterior recess of the knee joint cavity.
- On the anterior surface of the patella. Up to three bursae may be found in this area, located strictly in layers from superficial to deep tissues:
- Directly beneath the skin lies the subcutaneous prepatellar bursa (bursa subcutanea prepatellaris).
- Deeper, beneath the fascial layer, is the subfascial prepatellar bursa (bursa prepatellaris subfascialis).
- The deepest layer in this zone—beneath the aponeurotic expansion of the quadriceps femoris muscle—is occupied by the subtendinous prepatellar bursa (bursa subtendinea prepatellaris).
- Below the patella. In this zone, the deep infrapatellar bursa (bursa infrapatellaris profunda) is present. This is a constant anatomical structure. It is localized at the lower attachment site of the patellar ligament (lig. patellae), situated in the space between the ligament itself and the anterior surface of the tibia. Unlike the suprapatellar bursa, this structure never communicates with the knee joint cavity.
Arterial inflow
The blood supply to the anterior knee region is characterized by a dense arterial network. It is formed by vessels descending from above and ascending from below.
Sources from the femoral artery basin (from above):
- Superior medial and lateral genicular arteries (aa. superiores medialis et lateralis genus).
- Descending genicular artery (a. descendens genus), which is a direct branch of the femoral artery (a. femoralis).
- Descending branch of the lateral circumflex femoral artery (ramus descendens a. circumflexae femoris lateralis).
Sources from the tibial artery basin (from below):
- Inferior medial and lateral genicular arteries (aa. inferiores medialis et lateralis genus).
- Anterior and posterior recurrent tibial arteries (aa. recurrentes tibiales anterior et posterior). These vessels branch off from the anterior tibial artery (a. tibialis anterior) and run upward toward the knee.
Venous outflow system
Venous blood from the anterior knee region drains via companion veins that accompany the arteries. Notably, the outflow is directed exclusively into the deep vein system of the lower extremity.
The outflow pathway is as follows: Blood collects into the anterior tibial veins (vv. tibiales anteriores), which then transition into the popliteal vein (v. poplitea). From the popliteal fossa, the blood ascends further, entering the femoral vein (v. femoralis).
Briefly: answers to topical questions
Which nerves provide sensory innervation to the skin of the anterior knee region?
The skin of the anterior knee region is innervated by branches of the femoral and obturator nerves, as well as the saphenous nerve.
- Anterior cutaneous branches of the femoral nerve (rr. cutanei anteriores n. femoralis) — pierce the fascia lata along the medial margin of the sartorius muscle and extend to the patella.
- Cutaneous branch of the obturator nerve (r. cutaneus n. obturatorii) — penetrates the fascia at the middle of the medial surface of the thigh and reaches the patella.
- Saphenous nerve (n. saphenus) — gives off cutaneous branches medially, at the border with the anterior knee region.
To which regional lymph nodes does lymphatic drainage from the anterior knee region occur?
Lymphatic drainage from the skin of the anterior knee region flows into the inferior superficial inguinal lymph nodes (nodi inguinales superficiales inferiores), which collect lymph from the skin of the lower extremity. Deep popliteal lymph nodes (nodi lymphoidei poplitei profundi) drain lymph from the entire leg; their efferent vessels course toward the deep inguinal nodes.
Which tissue layers are distinguished during topographical dissection of the anterior knee region?
During topographical dissection of the anterior knee region, the following layers are sequentially identified:
- Skin — thick, mobile, allowing palpation of the patella.
- Subcutaneous tissue — contains branches of cutaneous nerves and vessels.
- Superficial fascia — contains the subcutaneous prepatellar bursa (bursa subcutanea prepatellaris).
- Deep fascia (fascia propria) — beneath it lie the subfascial bursa (bursa prepatellaris subfascialis) and the patellar vascular network (rete patellare).
- Aponeurotic expansion (m. quadriceps) — beneath it lies the subtendinous prepatellar bursa (bursa subtendinea prepatellaris).
Deeper, on the anterior surface of the joint, lies the dense genicular arterial network (rete articulare genus).
How is the arterial network of the knee joint (rete articulare genus) formed?
The genicular arterial network (rete articulare genus) is formed by anastomoses of arteries approaching from above and below. In the anterior region of the joint, they form superficial and deep arterial networks.
- From above (from the femoral artery basin) — superior medial and lateral genicular arteries (aa. superiores medialis et lateralis genus), descending genicular artery (a. descendens genus), and the descending branch of the lateral circumflex femoral artery.
- From below (from the tibial artery basin) — inferior medial and lateral genicular arteries (aa. inferiores medialis et lateralis genus), anterior and posterior recurrent tibial arteries (aa. recurrentes tibiales anterior et posterior).
To remember the layers of the anterior patellar bursae, use the "three S's" rule (from superficial to deep): Subcutaneous, Subfascial, Subtendinous.
Class and exam questions
Does the deep infrapatellar bursa communicate with the joint cavity?
No. The deep infrapatellar bursa (bursa infrapatellaris profunda), located between the patellar ligament and the tibia, is isolated and does not communicate with the joint cavity.
How often does the suprapatellar bursa merge with the knee joint cavity?
Such communication is very common—in approximately 85% of cases, the suprapatellar bursa connects with the upper anterior recess of the joint.
Which bursae are located directly on the anterior surface of the patella?
Up to three bursae lie there: the subcutaneous (bursa subcutanea prepatellaris), subfascial (bursa prepatellaris subfascialis), and subtendinous (bursa subtendinea prepatellaris) bursae.
Where does the venous drainage from the anterior region of the knee go?
Outflow occurs into the deep vein system: via the anterior tibial veins, blood enters the popliteal vein and then the femoral vein.
What else to study on this topic
- Clinical significance of the communication between the suprapatellar bursa and the joint cavity
- Topography of the fascial and fatty layers of the anterior knee
- Formation of anastomoses in the genicular arterial network (rete articulare genus)
- Relation of the deep infrapatellar bursa to the patellar ligament
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