Conditions that get confused, compared
Some conditions sit close enough together that people (and sometimes clinicians) get them mixed up. These pages lay the patterns side by side: where the pain sits, what triggers it, which tests help tell them apart, and what I check in clinic. Symptoms alone do not settle a diagnosis, and the two can also occur together.
Comparisons available
Hip OA vs. GTPS / lateral hip
Both present as hip pain in middle-aged and older adults, and both get called 'a hip problem' casually, but they live in different tissues. Hip osteoarthritis is a joint problem. Pain sits deep in the groin, range of motion is restricted, and internal rotation is the movement that suffers first. Greater trochanteric pain syndrome, which is mostly gluteal tendinopathy with or without associated bursitis, is a tendon and soft tissue problem on the outside of the hip. The point of tenderness is on the bony bump of the greater trochanter, range of motion at the hip is usually preserved, and the pain pattern is dominated by compression, side-lying, and single-leg loading rather than by stiffness.
Hamstring tendinopathy vs. Piriformis syndrome
Both cause deep buttock pain that is worse with sitting, which is exactly why they get mixed up. Proximal hamstring tendinopathy is a load problem in the tendon where the hamstrings attach to the sitting bone, so the pain is pinpoint and local. Piriformis syndrome is a deep gluteal nerve problem, where the piriformis and nearby muscles irritate the sciatic nerve, so the pain tends to sit higher in the buttock and often travels down the leg. One is a tendon under too much load; the other is a nerve under too much pressure.
Patellar tendinopathy vs. Patellofemoral pain
Both sit at the front of the knee and both flare with loaded knee bending. The difference comes down to where the pain points and what triggers it. Patellar tendinopathy is a localised tendon overload problem. The pain usually sits at the bottom tip of the kneecap on the tendon, flares with jumping and changes of direction, and often eases as the tendon warms up. Patellofemoral pain is pain around or behind the kneecap, often aggravated by squatting, stairs and running. It tends to be more diffuse and often does not warm up in the same way. These patterns overlap and the two can coexist, so an assessment looks at the full history and examination rather than one feature.
ACL injury vs. Meniscus tear
Both commonly follow a twisting knee injury, and both show up frequently in skiers, court sports, and soccer. They often travel together too. The classic O'Donoghue triad combines ACL rupture, medial collateral ligament injury, and a medial meniscus tear. Despite the overlap, the mechanism, swelling timing, exam findings, and natural history often point more toward one than the other, and imaging through a doctor fills the gap when it would change the plan. The reason this matters is practical: the management decisions, timelines, and return-to-sport plans look quite different.
Sciatica vs. Piriformis syndrome
Both can send pain from the buttock down the back of the leg, and both get lumped together as 'sciatica' in everyday language. Sciatica from the spine is irritation of a nerve root in the lower back, most often from a disc. Its symptoms often follow the strip of the leg that nerve root supplies (a dermatome), in more involved cases with changes in reflexes, strength, or sensation, and it can occur with or without much back pain. Piriformis syndrome, now often discussed under the broader heading of deep gluteal syndrome, is compression or irritation of the sciatic nerve in the buttock itself, below the spine. Same nerve, different location. The leg symptoms can look similar, and the history, what provokes the pain, and the exam findings help tell them apart. Neither a pain map nor a single nerve-tension test establishes the source on its own.
Rotator cuff vs. Frozen shoulder
Both cause shoulder pain and both make it hard to use the arm, but the mechanics are different. Rotator cuff problems are tendon and muscle driven, which means the cuff hurts and weakens but the joint can usually still be moved by someone else. Frozen shoulder (adhesive capsulitis) is a capsule problem, which means the whole joint stiffens, so even when someone else moves the arm it stops well short of normal. That difference is one of the most useful clues, and it is why the plans differ.
Tennis elbow vs. Golfer's elbow
Both are tendinopathies at the elbow, and the names are misleading. Tennis elbow sits on the outside of the elbow at the lateral epicondyle, where the wrist extensor tendons meet the bone. Golfer's elbow sits on the inside, at the medial epicondyle, where the wrist flexor and forearm pronator tendons attach. Same tissue type, opposite sides, different provocation patterns. People end up confusing them because the pain can spread down the forearm in both cases.