A deep ache behind the knee can involve muscle, tendon, joint or cyst-related pain; examination helps localize the source
Body region
Knee
Trigger points
3
documented in this muscle
Common symptoms
14
patterns cataloged
Common causes
15
contributory factors
Illustrated overview
Popliteus · Regional source example
Right popliteus: one source example shown in surface and anatomical views, with its posterior-knee pain pattern. Travell and Simons, Fig. 17.1, p. 340. Regional illustration; not an individual map of a selected numbered point.
Regional muscle reference; this is not an individual map of the selected numbered trigger point.
Pain referral. Back of knee, calf
Pain Pattern
Back of knee
Calf
Posterior knee
What This Pain Feels Like
A deep ache behind the knee may become more noticeable on descents or when bending and straightening the leg. The popliteus is one possible contributor, alongside the menisci, nearby tendons and a Baker cyst. Examination compares the location of pain, swelling and available movement. Repeated catching or a knee that remains stuck calls for joint assessment.
What Patients Report
Pain behind knee
Calf discomfort
Knee feels unstable
Pain when walking downhill
What Makes It Worse
Walking downhill
Running
Knee extension
Twisting
Cycling
A knee exercise should match your movement, comfort and stability. See the care options below for a suitable starting point.
Symptoms patients report
Back of knee pain A deep ache behind the knee can involve muscle, tendon, joint or cyst-related pain; examination helps localize the source
Calf pain Discomfort may extend into the upper calf; new one-sided calf swelling requires prompt assessment
Knee locking A knee that becomes stuck or cannot move through its usual range needs assessment for a meniscal tear or another joint problem
Difficulty straightening knee Pain, swelling or a joint problem can limit knee extension; assess the cause before forcing the knee straight
Posterior knee pain during knee flexion Bending the knee may reproduce posterior pain from several local structures, including the popliteus region
Difficulty fully straightening knee A persistent extension block warrants examination of the joint and surrounding structures
Posterior knee locking sensation Recurrent locking or catching needs a knee assessment, particularly after a twist or when accompanied by swelling
Pain walking downhill Descents may provoke posterior knee pain as the leg controls lowering and rotation
Posterior knee tenderness A clinician can assess tenderness and swelling with the knee supported; deep pressure in the central knee hollow can compress nearby vessels and nerves
Lateral knee pain Lateral joint-line pain can arise from the meniscus, popliteus tendon or other posterolateral structures
Posterior knee catching sensation Catching during movement is a reason to examine the knee joint, especially with pain, swelling or loss of motion
Pain when starting to bend a straight knee Note whether movement is painful but available or the knee is physically stuck; a fixed block needs prompt assessment
Difficulty with downhill walking Posterior or lateral pain on descents can reflect the combined loading of knee muscles, tendons and joint surfaces
Lateral knee joint line tenderness Joint-line tenderness helps locate symptoms but requires comparison with swelling, movement and the injury history
Common causes
Running downhill Downhill running increases demands on the muscles controlling knee flexion and rotation, including the popliteus
Sudden twisting A sudden turn with the foot planted can injure the popliteus tendon or other posterolateral knee structures
Knee hyperextension Forced hyperextension can injure the posterior capsule, ligaments or popliteus; swelling and instability guide assessment
Cycling Repetitive pedaling can provoke posterior knee symptoms, particularly after a change in training load or bicycle setup
Skiing Skiing combines sustained knee flexion with rotational loading of the knee
Downhill running or hiking Repeated descents can provoke posterior knee pain as the knee muscles control each step
Hyperextension knee injury A hyperextension injury can involve several posterior knee structures and warrants examination when pain or swelling persists
Rotational knee trauma The popliteus helps control tibial rotation; a forceful twist can also affect the menisci and knee ligaments
Prolonged crouching or squatting Long periods in deep knee flexion may provoke posterior knee discomfort or stiffness
Post-ACL or meniscal surgery guarding Postoperative pain, swelling and altered movement can increase posterior knee muscle guarding
Rotational knee injury Twisting injuries can affect the popliteus tendon and its connections within the posterolateral knee
ACL injury compensation Instability after ACL injury changes knee control and can increase demands on the surrounding muscles
Downhill running or skiing Repeated downhill activity combines knee flexion control with rotational demands
Sudden pivoting movements Rapid pivots load the posterolateral knee and may provoke symptoms from tendon, ligament or meniscal structures
Hyperextension injury Pain after forced hyperextension should be assessed for tendon, ligament and capsular injury
Treatment & self-care
Immediate Relief
Supported Knee Bending and Straightening
Sit or lie with the leg supported. Slowly slide the heel toward you, then away, through a comfortable range. Keep the movement easy and stop before sharp pain or catching. Leave the central hollow behind the knee free of ball or thumb pressure because major vessels and nerves pass through this area.
Duration
A few slow repetitions, guided by comfort
Frequency
During movement breaks if symptoms remain settled
Expect
Assess whether bending, straightening and the first few steps feel easier afterward
Caution Stop for catching, increased pain, tingling or numbness. Seek prompt assessment for a knee that remains stuck or new calf pain with swelling.
Immediate Relief
Moist Heat to Back of Knee
For uncomplicated stiffness, rest a comfortably warm towel over the supported knee. Use a fabric barrier and check the skin. Choose heat only when skin sensation is normal and the knee has no new swelling, redness or unusual warmth.
Duration
A brief application, checking skin comfort regularly
Frequency
As needed if it makes movement more comfortable
Expect
Possible temporary comfort; compare stiffness when starting to walk
Exercises
Gentle Hamstring and Calf Stretching
For a hamstring stretch, place the heel on a low support and lean slightly forward from the hips. For a calf stretch, face a wall with the affected foot behind you and its heel on the floor; gently shift forward with the back knee straight or slightly bent. Choose a mild muscle stretch and keep pressure or sharp pain out of the knee joint.
Duration
Brief comfortable holds, easing off fully between attempts
Frequency
Repeat when useful for comfortable movement
Expect
Assess comfort and available knee and ankle movement before and after stretching
Exercises
Supported Quadriceps Contraction
Sit or lie with the leg supported and a small folded towel beneath the knee. Gently tighten the front thigh to straighten the knee toward the towel, without forcing the joint into pain or hyperextension. Relax fully between attempts. This trains the quadriceps as part of knee rehabilitation.
Duration
Start with a few brief holds and build repetitions as tolerated
Frequency
Practice when knee motion is comfortable; adapt to any postoperative plan
Expect
Track control of knee straightening and comfort during standing and walking
Lifestyle Changes
Stair Descent Modification
Slow your pace, take shorter steps and use a handrail. Descend one step at a time when that is more comfortable. On steep terrain, choose a gentler route or reduce the distance. Increase the challenge as walking becomes easier and symptoms remain settled afterward.
Duration
During symptomatic stair and downhill walking
Frequency
Use the modification when it improves comfort or stability
Expect
Compare pain during the descent and the knee response later that day
Professional Treatment
Professional Evaluation if Swelling or Locking Present
Arrange a knee examination for recurrent catching, locking, swelling or giving way. The clinician checks movement, joint-line tenderness, stability and the calf, then selects imaging when the findings warrant it. Possible causes include meniscal injury, a Baker cyst, ligament injury and tendon disorders.
Duration
Assessment and follow-up based on the findings
Frequency
Promptly for a fixed block or worsening symptoms
Expect
A working diagnosis and a plan matched to the cause of posterior knee pain
Caution Seek urgent assessment for a knee that remains stuck, inability to bear weight, a hot swollen joint or new calf pain with swelling. Calf symptoms with chest pain or breathlessness require emergency care.
Open full-size image
Open full-size image