Posterior knee pain

[The Full Nelson]

I have a patient who presented with:

*insidious, sudden onset knee pain.
*explains area behind knee jt, medial joint line, and radiating to ankle (has limited ankle inv/eversion compared to other foot).
*complaining of altered sensation in area of dorsum of foot
*lumbar, SIJ, pelvic, hip - clear
*is unable to achieve terminal knee ext, or >75deg knee flexion.
*pt is not sporty or active (desk job) - 30years old
*nil past history
*nil clicking, locking, grinding

Has felt knee "nearly give way" since pain began.

McMurray's negative (but difficult due to lack of range)
MCL/LCL/ACL/PCL negative
Swelling in posterior compartment (popliteal fossa)
Tender, thickened over popliteus
Very tight hamstrings, gastroc

Any thoughts??

?posterior horn meniscus injury - any other tests i should perform to confirm?
?Baker's cyst
?posterior capsule
?bursitis

help!

Should i be worried about anything sinister? Am i missing something obvious?

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