Introduction
Low back pain is a common complaint among basketball players, but often the source of pain is not the lumbar spine, but the Sacroiliac Joint (SI joint). This joint, located at the posterior pelvis, bears the load transmitted from the upper body to the lower limbs. Once imbalanced, jump shots, drives, and changes of direction are all affected.
This article summarizes the assessment and treatment strategies for SI joint dysfunction.
Anatomy and Function
The SI joint lies between the sacrum and the ilium, stabilized by a strong ligamentous complex. Its range of motion is very small (< 4 degrees), yet it bears tremendous stress, particularly during the single-leg stance phase.
Mechanism of Injury
- Asymmetric loading on one side of the pelvis upon landing
- Repetitive torsion (e.g., pivot shots)
- Insufficient core strength
- Restricted hip range of motion
Differential Diagnosis
| Condition | Key Distinguishing Features |
|---|---|
| Disc herniation | Lower extremity radicular pain, positive straight leg raise |
| Lumbar facet joint | Pain with extension, unilateral tenderness |
| SI joint | Positive on 4–5 provocation tests |
| Hip joint | Positive FADIR/FABER |
| Piriformis syndrome | Buttock pain in sitting, radiating to posterior thigh |
SI Joint Assessment (Laslett Cluster)
Diagnosis is made with 3 positive findings out of the following 5:
- Distraction test
- Compression test
- Thigh thrust
- Sacral thrust
- Gaenslen test
Treatment Strategy
- Manual therapy
- Joint mobilization
- Iliac bone repositioning techniques
- Stability training
- Dead bug, bird dog
- Bridge progression
- Hip mobility
- 90/90 stretch
- Iliopsoas release
- Pelvic belt (SI belt): may be used short-term in the acute phase
- Injection therapy: consider SI joint injection for refractory cases
Rehabilitation Timeline
| Phase | Duration | Focus |
|---|---|---|
| Acute | 0–2 weeks | Manual therapy, pain relief |
| Early | 2–4 weeks | Core activation |
| Intermediate | 4–8 weeks | Functional stability |
| Advanced | 8–12 weeks | Jump shots, changes of direction |
| Return to play | 12–16 weeks | Full training |
Practical Recommendations
- Do not treat SI joint pain as a disc problem
- Strengthening the core is more important than stretching
- If you feel a “catching” sensation in the pelvis during running or jump shots, get assessed
- Perform dead bug and bird dog 2–3 times per week during the season
- Hip mobility and core stability are both indispensable
- NTNU Sports Science Center and Chang Gung Sports Medicine Center offer comprehensive pelvic assessments
Prevention Strategies
- Assess bilateral strength balance before the season
- Incorporate unilateral movements into the training program
- Avoid prolonged unilateral postures (e.g., habitually driving left)
- Moderate fascial release
Conclusion
SI joint dysfunction is an injury that is “easy to locate, easy to diagnose, and easy to overlook in rehabilitation.” Many basketball players assume low back pain is normal, not realizing that a small pelvic imbalance can ruin an entire season. Take it seriously and treat it thoroughly.
Related Reading
- Elbow Osteophytes and Ligaments: Long-Term Changes in a Basketball Player’s Shooting Elbow
- Low Back Pain After Cycling: Improving Core Insufficiency and Postural Issues
- Low Back Pain and Cycling: Cause Analysis, Posture Correction, and Long-Term Solutions
- Cycling Low Back Pain: Management Options with Core Strengthening and Riding Posture Adjustment
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