Why do different joints hurt in different ways?

Why do my knee and hip feel stiff?

A worn knee may feel stiff after sitting, then loosen after a few steps. Swelling, grinding, or trouble on stairs can come and go with use.

Hip soreness may sit in the groin, thigh, buttock, or outer side. That pain doesn't always start in your hip; it can come from your back.

Gentle leg work can keep both joints moving without a hard workout. If an activity brings sharp soreness or buckling, stop and tell your medical worker.

Why does my shoulder or back act differently?

A shoulder may hurt with an overhead reach, lifting, or sleep on one side. Weakness or a sudden loss of motion deserves an exam.

Back soreness may come from muscle, nerve, or a spinal disc, the cushion between back bones. Sitting, bending, and long periods of standing may each make it worse.

QC Kinetix calls its blood-based shots biologic therapies because they use material from your blood. A medical provider, the licensed worker doing your exam, can discuss fit, cost, and time.

What can I try before making an appointment?

Change the activity that starts a flare, then return in smaller amounts. Warmth may ease movement, but it won't explain why the joint hurts.

PRP is a blood shot prepared by spinning your blood and keeping a platelet-rich part. If it's offered, ask who gives the shot and whether that person is a doctor.

Don't wait for office hours after a serious fall or sudden loss of strength. Fever with joint heat, or lost bladder control with back soreness, needs urgent medical care.

Sources

1. A 2024 systematic review of bone marrow aspirate concentrate for HIP osteoarthritis found the clinical evidence base thinner than for the knee, with most studies uncontrolled - the joint matters, and evidence does not transfer across joints.

   Chandrashekar S, et al. — Safety and Efficacy of Bone-Marrow Aspirate Concentrate in Hip Osteoarthritis: A Systematic Review of Current Clinical Evidence. Indian J Orthop, 2024. DOI: 10.1007/s43465-024-01183-7.

2. In a Level I randomized trial of arthroscopic rotator cuff repair, augmenting the repair with concentrated bone marrow aspirate was compared against a sham incision with MRI assessment of structural healing at one year - the rare cell-therapy question asked with a proper blinded control.

   Cole BJ, et al. — Prospective Randomized Trial of Biologic Augmentation With Bone Marrow Aspirate Concentrate in Patients Undergoing Arthroscopic Rotator Cuff Repair. Am J Sports Med, 2023. DOI: 10.1177/03635465231154601.

3. A 2025 systematic review of BMAC in rotator cuff repair found that of the two comparative studies included, neither showed a difference in patient-reported outcomes between the biologic and control groups, and preparation and dosing varied widely between studies.

   Carola N, et al. — Bone Marrow Aspirate Concentrate May Improve Healing and Function in Rotator Cuff Repair: A Systematic Review. Arthroscopy, 2025. DOI: 10.1016/j.arthro.2024.11.060.

4. A phase I single-arm study of 10 patients with chronic discogenic low back pain found a single intradiscal injection of adipose-derived MSCs with hyaluronic acid produced no procedure-related or cell-related adverse events over 12 months - a safety signal in 10 people, not an efficacy result.

   Kumar H, et al. — Safety and tolerability of intradiscal implantation of combined autologous adipose-derived mesenchymal stem cells and hyaluronic acid in patients with chronic discogenic low back pain: 1-year follow-up of a phase I study. Stem Cell Res Ther, 2017. DOI: 10.1186/s13287-017-0710-3.

5. A multicenter crossover randomized controlled trial randomized 40 patients with discogenic chronic low back pain to saline trigger point injection, intradiscal PRP, or intradiscal bone marrow concentrate with 12-month follow-up - one of very few controlled spine trials in this field, and it enrolled 40 people.

   Navani A, et al. — The Safety and Effectiveness of Orthobiologic Injections for Discogenic Chronic Low Back Pain: A Multicenter Prospective, Crossover, Randomized Controlled Trial with 12 Months Follow-up. Pain Physician, 2024.

6. In a randomized trial of 118 knee osteoarthritis patients followed for 2 years with serial MRI, a single microfragmented adipose tissue injection and a single PRP injection produced statistically and clinically similar improvement - and the imaging showed no structural advantage for either.

   Zaffagnini S, et al. — Microfragmented Adipose Tissue Versus Platelet-Rich Plasma for the Treatment of Knee Osteoarthritis: A Prospective Randomized Controlled Trial at 2-Year Follow-up. Am J Sports Med, 2022. DOI: 10.1177/03635465221115821.

7. A phase III double-blind placebo-controlled trial in 261 patients with Kellgren-Lawrence grade 3 knee osteoarthritis tested a single injection of autologous culture-expanded adipose-derived mesenchymal stem cells - a product that cannot legally be sold outside a clinical trial in the United States because culture expansion is more than minimal manipulation.

   Kim KI, et al. — Clinical Efficacy and Safety of the Intra-articular Injection of Autologous Adipose-Derived Mesenchymal Stem Cells for Knee Osteoarthritis: A Phase III, Randomized, Double-Blind, Placebo-Controlled Trial. Am J Sports Med, 2023. DOI: 10.1177/03635465231179223.

8. A 2024 systematic review of 8 Level I randomized trials in 937 patients found bone marrow aspirate concentrate improved pain and function versus baseline from one month, but the comparative advantage over other injections was inconsistent across timepoints.

   Han JH, et al. — Bone Marrow Aspirate Concentrate Injections for the Treatment of Knee Osteoarthritis: A Systematic Review of Randomized Controlled Trials. Orthop J Sports Med, 2024. DOI: 10.1177/23259671241296555.

9. In a 480-patient, four-arm, multicenter randomized phase 2/3 trial, none of three orthobiologic cell injections - autologous bone marrow aspirate concentrate, autologous adipose stromal vascular fraction, or allogeneic umbilical cord tissue-derived mesenchymal stromal cells - was superior to any other, or to a corticosteroid injection control, on pain at 12 months.

   Mautner K, et al. — Cell-based versus corticosteroid injections for knee pain in osteoarthritis: a randomized phase 3 trial. Nat Med, 2023. DOI: 10.1038/s41591-023-02632-w.