You have been treating inflammation that is not there.

PRP FOR MEDIAL EPICONDYLITIS

Medial epicondylitis is the quieter sibling of tennis elbow: less common, less studied, and more often mistaken for something else.

What is failing

The flexor-pronator origin on the inside of the elbow takes the load every time you grip while rotating the forearm inward. As with the lateral side, chronic medial elbow pain is degenerative rather than inflammatory — disorganized collagen and neovascular ingrowth at a poorly perfused enthesis, not a swollen tendon.

There is an anatomical complication the lateral side does not have. The ulnar nerve runs in its groove immediately behind the medial epicondyle. A meaningful share of people with medial elbow pain have an ulnar nerve component — tingling into the ring and little fingers, symptoms worse with the elbow bent, night waking with a numb hand. If that is present, treating the tendon alone will disappoint, and injecting without recognizing it risks putting a needle somewhere it should not be.

Why it stalls

The same two biological brakes apply: compromised microvascular supply at the enthesis and collagen laid down under metabolic stress, cross-linked poorly and glycated, which behaves worse under load than the tissue it replaced. Add the occupational reality — this is a pipefitter’s, carpenter’s and warehouse worker’s injury far more than a golfer’s — and the repetitive gripping continues because it is the job.

What PRP contributes

The rationale is the same as the lateral side and the practice is more cautious. Injection is ultrasound-guided, both to find the degenerate segment of the common flexor origin and to keep clear of the ulnar nerve. Needle fenestration converts a stalled chronic lesion into an acute one, and the platelet concentrate supplies the growth-factor signal the tendon stopped producing.

Evidence here is thinner than for lateral epicondylitis, largely because the condition is less common and trials are smaller. What exists points the same direction, and the underlying pathology is the same, so the mechanistic argument carries more of the weight than it does at the elbow’s outside. We say than imply a literature that is not there.

When it is not the tendon

• Ulnar neuropathy at the elbow — numbness or tingling in the ring and little fingers, worse with the elbow flexed
• Ulnar collateral ligament injury — throwers, and anyone with instability rather than local tenderness
• Referred cervical pain — a C8 or T1 radiculopathy can present as medial elbow ache with no local pathology at all

Sorting this out before injecting anything is most of the value of the appointment.

Treatment and what follows

One injection, occasionally two, ultrasound-guided. Soreness for several days. The rehabilitation emphasis is on the wrist flexors and pronators with eccentric and heavy slow resistance loading, and on whatever upstream mechanics are dumping load onto the elbow — frequently a shoulder that has stopped rotating and a grip pattern compensating for it.

Timelines match the lateral side: little at two weeks, first signal around six, the meaningful answer at three months, continued gain to six.

The loading work that follows

An injection without a loading program is half a treatment. The flexor-pronator mass responds to the same staged approach the lateral side does, with the emphasis shifted toward pronation control.

• Weeks 0–2 Isometric wrist flexion holds, which reduce tendon pain in their own right, and avoidance of sustained gripping while pronated.
• Weeks 2–6 Eccentric wrist flexion and slow resisted pronation and supination, working into discomfort rather than through pain.
• Weeks 6–12 Heavy slow resistance, plus grip work reintroduced in the positions your job actually demands rather than in neutral.
• Ongoing Shoulder and scapular mechanics, because a forearm compensating for a shoulder that no longer rotates will keep reloading the same enthesis.

Why this one is easy to get wrong

Two mistakes are common. The first is treating the tender spot rather than the degenerate tissue — they are frequently a centimeter or two apart, and ultrasound is what distinguishes them. The second is missing a coexisting ulnar neuropathy and then judging the injection a failure when the numbness persists, which it was never going to change.

There is also a timing error worth naming: people often present here after a year or more, having been told to rest it. Tendons do not recover with rest alone once the repair has stalled; they recover with load applied to tissue that has been given a reason to rebuild. The waiting is not neutral, because the collagen continues to disorganize while you wait.

Reducing the odds it returns

Recurrence is common where nothing about the load changes. Practical things that measurably help: grip diameter on the tools you use most, forearm supports where the job allows, breaking up sustained gripping into intervals, and maintaining the heavy slow resistance work at a lower dose indefinitely rather than stopping the day it stops hurting. Tendon capacity is a use-it-or-lose-it property.

The metabolic side is the same conversation as everywhere else on this site, and it is not a lecture: sleep and glycemic control alter the raw material available for repair, which changes how much load the tendon can carry before it fails again.

What the evidence actually shows here

Medial epicondylitis has a fraction of the trial volume of its lateral counterpart. The studies that exist are small, several are non-randomized, and follow-up is generally shorter. That is a real limitation and it changes how confidently anyone should speak.

What can be said: the histology is the same degenerative process, the mechanism by which PRP would help is therefore the same, and the small comparative studies available point in the same direction as the larger lateral-elbow literature — corticosteroid ahead early, PRP ahead by three months and holding. Where a treatment rests more on mechanism than on trials we say so, because that is a different quality of evidence and you are entitled to weigh it differently.

It is also why the assessment matters more here. When the literature cannot tell you the average answer with confidence, getting your particular diagnosis right carries more of the load.

When the inside of the elbow stays sore

Three questions come before a second one. Was the diagnosis complete — in particular, was there an ulnar nerve or ligament component doing part of the work? Did the loading program actually happen, at the doses that organize collagen rather than the ones that merely feel productive? And was the metabolic terrain ever looked at, or did we treat a tendon in a body that was making poor collagen the whole time?

Only when those are answered does a second injection, a different preparation, or a surgical opinion make sense. We send you away with a plan that does not involve us than sell a repeat of something that already failed.

Questions about the inside of the elbow

Is this the same as tennis elbow?

Same pathology, opposite side of the elbow, plus a nerve that has to be respected. Tennis elbow.

Why does my hand go numb?

That is the ulnar nerve, not the tendon, and it changes the plan. How we assess.

Can I keep lifting?

Grip-and-pronate load is modified for a period; general activity continues. What to expect.

How many injections?

Usually one, sometimes two at six weeks. Recovery timeline.

Related reading

• Tennis elbow
• How PRP works
• PRP compared with cortisone
• Am I a candidate?

The medial elbow has less published work behind it than the lateral side, and far less than the large tendons. We assess the same systemic picture here for mechanistic reasons rather than because a study has quantified it at this specific tendon — the evidence that does exist, across tendons generally, is on the tendinopathy page.